Harvard Extension School
CSCI E-12 Fundamentals of Web Site Development | Fall 2019

# Session 03 - HTML, Introduction to CSS

Harvard Extension School
Fall 2019

Course Web Site: http://cscie12.dce.harvard.edu/

Instructor email: david_heitmeyer@harvard.edu
Course staff email: cscie12@dce.harvard.edu

### Topics

1. Forms - Basic
2. Accessibility: Label Element
3. Additional Form Features
4. HTML5 - Some of What's New With Forms
5. Tables
6. Accessibilty of Tables
7. Section-level elements
8. Presentation - Cascading Style Sheets (CSS)
9. CSS Mechanics - rules and selectors
10. Basic Selectors - elements, class, id
11. CSS Properties and Values
12. Tools: Your Browser
13. Tools: JS Fiddle

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## Forms - Basic

Two elements for forms are in our list of most commonly seen elements:

- `form`
- `input`

### Forms

Forms are the "front-end" for the HTTP Client to send information back to the HTTP Server. The submitted information is passed from the HTTP Server to a server-side program that processes the information and produces a response for the browser.

## Forms

- Text
  - Single line (text input)
  - Password
  - Text area (textarea)
- Choices
  - Choose one
    - radio group
    - option list (menu)
  - Choose one or more
    - checkbox group
    - option list (menu)
- File Upload
- Hidden
- Submit

## form

Attributes

- method ("get" or "post")
- action (URL of CGI program)
- enctype

Each element within a form has a name associated with it. When the information is sent back to the server, the CGI program will access the information by name. Thus, the front-end form and the back-end program must use the same names.

While exploring forms, it is useful to use a simple "echo" CGI program, which will simply echo back the name/value information your form submitted (https://cscie12.dce.harvard.edu/echo).

Example 3.1 - Simple form - Example 3.1 |
<form method="post" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Email Address:<input type="text" name="email"/><br/><input type="submit"/></form>

- Markup
- Display

    <form method="post" action="https://cscie12.dce.harvard.edu/echo">
    Email Address:
    <input type="text" name="email"/><br/>
    <input type="submit"/>
    </form>

Email Address:

## Get vs. Post

get: form information sent from browser to server as part of query string, visible in the URL

- Query String

- `http://host/path?param1=value1&param2=value2&param3=value3`
- Question mark
- Ampersand separated parameter/value pairs
- parameter=value

post: form information sent from browser to server as part of HTTP body; not in URL
Example 3.2 - Simple for using 'get' - Example 3.2 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Email Address:<input type="text" name="email"/><br/><input type="submit"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    Email Address:
    <input type="text" name="email"/><br/>
    <input type="submit"/>
    </form>

Email Address:
Example 3.3 - Simple form using 'post' - Example 3.3 |
<form method="post" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Email Address:<input type="text" name="email"/><br/><input type="submit"/></form>

- Markup
- Display

    <form method="post" action="https://cscie12.dce.harvard.edu/echo">
    Email Address:
    <input type="text" name="email"/><br/>
    <input type="submit"/>
    </form>

Email Address:

## Text Field

Example 3.4 - Form: text input - Example 3.4 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Email Address:<input type="text" name="email" size="50"/><br/> Year of Birth:<input type="text" name="year_of_birth" size="50" maxlength="4"/><br/> Year of Birth:<input type="text" name="year_of_birth_2" size="5" maxlength="4"/><br/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    Email Address:
    <input type="text" name="email" size="50"/><br/>Year of Birth:
    <input type="text" name="year_of_birth" size="50" maxlength="4"/><br/>Year of Birth:
    <input type="text" name="year_of_birth_2" size="5" maxlength="4"/><br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

Email Address:
Year of Birth:
Year of Birth:

## Radio Buttons

Example 3.5 - Form: radio buttons - Example 3.5 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Email Address:<input type="text" name="email" size="50"/><br/> Please send me email updates:<br/><input type="radio" name="sendupdates" value="yes" checked="checked"/>yes<br/><input type="radio" name="sendupdates" value="no"/>no<br/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    Email Address:
    <input type="text" name="email" size="50"/><br/>Please send me email updates:<br/>
    <input type="radio" name="sendupdates" value="yes" checked="checked"/>yes<br/>
    <input type="radio" name="sendupdates" value="no"/>no<br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

Email Address:
Please send me email updates:
yes
no

## Checkbox

Example 3.6 - Form: checkboxes - Example 3.6 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> What ice cream do you like?<br/><input type="checkbox" name="icecream" value="chocolate"/>Chocolate<br/><input type="checkbox" name="icecream" value="chocolate peanut butter"/>Chocolate Peanut Butter<br/><input type="checkbox" name="icecream" value="vanilla"/>Vanilla<br/><input type="checkbox" name="icecream" value="strawberry"/>Strawberry<br/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    What ice cream do you like?<br/>
    <input type="checkbox" name="icecream" value="chocolate"/>Chocolate<br/>
    <input type="checkbox" name="icecream" value="chocolate peanut butter"/>Chocolate Peanut Butter<br/>
    <input type="checkbox" name="icecream" value="vanilla"/>Vanilla<br/>
    <input type="checkbox" name="icecream" value="strawberry"/>Strawberry<br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

What ice cream do you like?
Chocolate
Chocolate Peanut Butter
Vanilla
Strawberry

## Textarea

Example 3.7 - Form: textarea - Example 3.7 |

- Markup
- Display

    <form method="post" action="https://cscie12.dce.harvard.edu/echo">
    <strong>Comments</strong><br/>
    <textarea name="comments" rows="10" cols="50">Please enter comments...</textarea><br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

Comments
Please enter comments...

## Select and Option

### Pull-down menu

Example 3.8 - Pull-down List - Example 3.8 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Select your favorite New England states:<br/><select name="state"><option value="CT">Connecticut</option><option value="ME">Maine</option><option value="MA">Massachusetts</option><option value="NH">New Hampshire</option><option value="RI">Rhode Island</option><option value="VT">Vermont</option></select><br/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    Select your favorite New England states:<br/>
    <select name="state">
    <option value="CT">Connecticut</option>
    <option value="ME">Maine</option>
    <option value="MA">Massachusetts</option>
    <option value="NH">New Hampshire</option>
    <option value="RI">Rhode Island</option>
    <option value="VT">Vermont</option></select><br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

Select your favorite New England states:

### Scrollable list

Note: because scrollable lists are difficult for users, they are not typically used.

A scrollable list (`size` attribute) that can have multiple selections (`multiple` attribute):

Example 3.9 - Scrollable List - Example 3.9 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"> Select your favorite New England states:<br/><select name="state" size="3" multiple="multiple"><option value="CT">Connecticut</option><option value="ME">Maine</option><option value="MA">Massachusetts</option><option value="NH">New Hampshire</option><option value="RI">Rhode Island</option><option value="VT">Vermont</option></select><br/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    Select your favorite New England states:<br/>
    <select name="state" size="3" multiple="multiple">
    <option value="CT">Connecticut</option>
    <option value="ME">Maine</option>
    <option value="MA">Massachusetts</option>
    <option value="NH">New Hampshire</option>
    <option value="RI">Rhode Island</option>
    <option value="VT">Vermont</option></select><br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

Select your favorite New England states:

## Accessibility: Label Element

Labels are important for accessible forms.

label element lets us use markup to associate text with an input element.

Using `label` you can make the association between the text label and the form input explicit, and not just rely on the visual proximity.

### Labels - Why?

- Makes text labels associated wtih input elements explicit
- Helps with screen readers!
- Helps with "clicks" and touch screens!

### Labels - How

- id attribute for form input
- label element for input label
- for attribute in label to link label element with input via the value of id

Example 3.10 - Form Labels - Example 3.10 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"><p>Do you like to watch NCAA basketball?</p><input type="radio" name="basketball" id="basketball_y" value="Y"/><label for="basketball_y">Yes</label><br/><input type="radio" name="basketball" id="basketball_n" value="N"/><label for="basketball_n">No</label><br/><input type="submit"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    <p>Do you like to watch NCAA basketball?</p>

    <input type="radio" name="basketball" id="basketball_y" value="Y"/><label for="basketball_y">Yes</label><br/>
    <input type="radio" name="basketball" id="basketball_n" value="N"/><label for="basketball_n">No</label><br/>
    <input type="submit"/>
    </form>

Do you like to watch NCAA basketball?

Yes
No

## Labels

Example 3.11 - Form Labels - Example 3.11 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"><div> What ice cream do you like? <br/><input type="checkbox" name="icecream" id="icecream_chocolate" value="chocolate"/><label for="icecream_chocolate">Chocolate</label><br/><input type="checkbox" name="icecream" id="icecream_cpb" value="chocolate peanut butter"/><label for="icecream_cpb">Chocolate Peanut Butter</label><br/><input type="checkbox" name="icecream" id="icecream_vanilla" value="vanilla"/><label for="icecream_vanilla">Vanilla</label><br/><input type="checkbox" name="icecream" id="icecream_strawberry" value="strawberry"/><label for="icecream_strawberry">Strawberry</label><br/><input type="submit" name="action" value="Proceed"/></div></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    <div>What ice cream do you like?<br/>
    <input type="checkbox" name="icecream" id="icecream_chocolate" value="chocolate"/><label for="icecream_chocolate">Chocolate</label><br/>
    <input type="checkbox" name="icecream" id="icecream_cpb" value="chocolate peanut butter"/><label for="icecream_cpb">Chocolate Peanut Butter</label><br/>
    <input type="checkbox" name="icecream" id="icecream_vanilla" value="vanilla"/><label for="icecream_vanilla">Vanilla</label><br/>
    <input type="checkbox" name="icecream" id="icecream_strawberry" value="strawberry"/><label for="icecream_strawberry">Strawberry</label><br/>
    <input type="submit" name="action" value="Proceed"/></div>
    </form>

What ice cream do you like?
Chocolate
Chocolate Peanut Butter
Vanilla
Strawberry

## Additional Form Features

Here we'll cover some additional form features that fit in the "less used" or "advanced" categories.

## Password

Example 3.12 - Password input field - Example 3.12 |
<form method="post" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded">Secret word:<input type="password" name="secretword" size="10"/><br/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="post" action="https://cscie12.dce.harvard.edu/echo">
    Secret word:
    <input type="password" name="secretword" size="10"/><br/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

Secret word:

## Hidden

Example 3.13 - Hidden form field - Example 3.13 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"><input type="hidden" name="myhiddenvariable" value="myhiddenvalue"/><input type="submit" name="action" value="Proceed"/></form>

- Markup
- Display

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">

    <input type="hidden" name="myhiddenvariable" value="myhiddenvalue"/>
    <input type="submit" name="action" value="Proceed"/>
    </form>

## File Upload

With file uploads, the `enctype` of the form needs to be `multipart/form-data`

Example 3.14 - File Upload - Example 3.14 |
<form method="post" enctype="multipart/form-data" action="https://cscie12.dce.harvard.edu/echo">Upload two files:<br/><input type="file" name="file1"/><br/><input type="file" name="file2"/><br/><input type="submit" name="action" value="Upload"/></form>

- Markup
- Display

    <form method="post" enctype="multipart/form-data" action="https://cscie12.dce.harvard.edu/echo">
    Upload two files:<br/>
    <input type="file" name="file1"/><br/>
    <input type="file" name="file2"/><br/>
    <input type="submit" name="action" value="Upload"/>
    </form>

Upload two files:

## Disabled Form Input Elements

Disabled form elements are used to show something is there, but not currently active.

For example, a form submit might be inactive unless the user has agreed to terms. For that example, we'd need to use JavaScript to change the "disabled" state of the submit input element based on whether the "agree" radio button is selected.

disabled vs disabled="disabled". Note that in the "XML" form of HTML5, the disabled attribute has to have a value, where as in the HTML form of HTML5, the disabled attribute can be on its own.

XML form of HTML5 | HTML form of HTML5
--- | ---
    <input disabled="disabled" type="submit"/>
    <input disabled type="submit">

Disabled "submit" input:

Enabled "submit" input:

### Disabled Form Components

HTML Form with basic components
Basic Form

HTML Form with basic components disabled
Basic Form Disabled

## fieldset and legend

fieldset and legend elements can further help group related input fields.

Example 3.15 - Form fieldset and legend elements - Example 3.15 |
<form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"><div><fieldset><legend>Name</legend><label for="fname">First Name </label><input type="text" name="fname" id="fname" size="30"/><br/><label for="lname">Last Name </label><input type="text" name="lname" id="lname" size="30"/><br/></fieldset><fieldset><legend>Sports</legend><div>Do you enjoy basketball?</div><input type="radio" name="basketball" id="basketball_yes" value="Y"/><label for="basketball_yes">Yes</label><br/><input type="radio" name="basketball" id="basketball_no" value="N"/><label for="basketball_no">No</label><br/><div>Do you enjoy baseball?</div><input type="radio" name="baseball" id="baseball_yes" value="Y"/><label for="baseball_yes">Yes</label><br/><input type="radio" name="baseball" id="baseball_no" value="N"/><label for="baseball_no">No</label></fieldset><input type="submit"/></div></form>

- Markup
- Display
- Screenshot

    <form method="get" action="https://cscie12.dce.harvard.edu/echo">
    <div><fieldset><legend>Name</legend><label for="fname">First Name</label>
    <input type="text" name="fname" id="fname" size="30"/><br/><label for="lname">Last Name</label>
    <input type="text" name="lname" id="lname" size="30"/><br/></fieldset><fieldset><legend>Sports</legend><div>Do you enjoy basketball?</div>
    <input type="radio" name="basketball" id="basketball_yes" value="Y"/><label for="basketball_yes">Yes</label><br/>
    <input type="radio" name="basketball" id="basketball_no" value="N"/><label for="basketball_no">No</label><br/><div>Do you enjoy baseball?</div>
    <input type="radio" name="baseball" id="baseball_yes" value="Y"/><label for="baseball_yes">Yes</label><br/>
    <input type="radio" name="baseball" id="baseball_no" value="N"/><label for="baseball_no">No</label></fieldset>
    <input type="submit"/></div>
    </form>

Name
First Name
Last Name
Sports
Do you enjoy basketball?
Yes
No
Do you enjoy baseball?
Yes
No

### You can apply CSS rules to fieldset and legend

## optgroup

The optgroup element allows you to group a long select list.

Example 3.16 - Form: optgroup in pull-down menus - Example 3.16 |
<p>Select a school:</p><form method="get" action="https://cscie12.dce.harvard.edu/echo" enctype="application/x-www-form-urlencoded"><select name="school"><optgroup label="ACC"><option>Boston College</option><option>Clemson</option><option>Duke</option><option>Florida State</option><option>Georgia Tech</option><option>Louiville</option><option>Miami</option><option>North Carolina</option><option>North Carolina State</option><option>Notre Dame</option><option>Pitt</option><option>Syracuse</option><option>Virginia</option><option>Virginia Tech</option><option>Wake Forest</option></optgroup><optgroup label="Big 10"><option>Illinois</option><option>Indiana</option><option>Iowa</option><option>Maryland</option><option>Michigan</option><option>Michigan State</option><option>Minnesota</option><option>Nebraska</option><option>Northwestern</option><option>Ohio State</option><option>Penn State</option><option>Purdue</option><option>Rutgers</option><option>Wisconsin</option></optgroup><optgroup label="Big XII"><option>Baylor</option><option>Iowa State</option><option>Kansas</option><option>Kansas State</option><option>Oklahoma</option><option>Oklahoma State</option><option>Texas</option><option>Texas Christian</option><option>Texas Tech</option><option>West Virginia</option></optgroup><optgroup label="Ivy League"><option>Brown</option><option>Columbia</option><option>Cornell</option><option>Dartmouth</option><option>Harvard</option><option>Penn </option><option>Princeton</option><option>Yale</option></optgroup><optgroup label="Pac 12"><option>Arizona</option><option>Arizona State</option><option>California</option><option>Colorado</option><option>Oregon</option><option>Oregon State</option><option>Stanford</option><option>UCLA</option><option>USC</option><option>Utah</option><option>Washington</option><option>Washington State</option></optgroup></select><div><input type="submit"/></div></form>

- Markup
- Display
- Screenshot

    <p>Select a school:</p>
    <form method="get" action="https://cscie12.dce.harvard.edu/echo">

    <select name="school">
    <optgroup label="ACC">
    <option>Boston College</option>
    <option>Clemson</option>
    <option>Duke</option>
    <option>Florida State</option>
    <option>Georgia Tech</option>
    <option>Louiville</option>
    <option>Miami</option>
    <option>North Carolina</option>
    <option>North Carolina State</option>
    <option>Notre Dame</option>
    <option>Pitt</option>
    <option>Syracuse</option>
    <option>Virginia</option>
    <option>Virginia Tech</option>
    <option>Wake Forest</option></optgroup>
    <optgroup label="Big 10">
    <option>Illinois</option>
    <option>Indiana</option>
    <option>Iowa</option>
    <option>Maryland</option>
    <option>Michigan</option>
    <option>Michigan State</option>
    <option>Minnesota</option>
    <option>Nebraska</option>
    <option>Northwestern</option>
    <option>Ohio State</option>
    <option>Penn State</option>
    <option>Purdue</option>
    <option>Rutgers</option>
    <option>Wisconsin</option></optgroup>
    <optgroup label="Big XII">
    <option>Baylor</option>
    <option>Iowa State</option>
    <option>Kansas</option>
    <option>Kansas State</option>
    <option>Oklahoma</option>
    <option>Oklahoma State</option>
    <option>Texas</option>
    <option>Texas Christian</option>
    <option>Texas Tech</option>
    <option>West Virginia</option></optgroup>
    <optgroup label="Ivy League">
    <option>Brown</option>
    <option>Columbia</option>
    <option>Cornell</option>
    <option>Dartmouth</option>
    <option>Harvard</option>
    <option>Penn</option>
    <option>Princeton</option>
    <option>Yale</option></optgroup>
    <optgroup label="Pac 12">
    <option>Arizona</option>
    <option>Arizona State</option>
    <option>California</option>
    <option>Colorado</option>
    <option>Oregon</option>
    <option>Oregon State</option>
    <option>Stanford</option>
    <option>UCLA</option>
    <option>USC</option>
    <option>Utah</option>
    <option>Washington</option>
    <option>Washington State</option></optgroup></select><div>
    <input type="submit"/></div>
    </form>

Select a school:

## HTML5 - Some of What's New With Forms

- HTML5 - Forms (W3C Recommendation)
- HTML5 Rocks: Making Forms Fabulous with HTML5
- Dive Into HTML5: A Form of Madness
- Can I use...HTML5 form features

### Some HTML5 Form additions

- HTML5 Form Example
- placeholder text
- autofocus
- input types for
  - email
  - url
  - number
  - range
  - date and time

## HTML5: Placeholder

Placeholder text can:

- Provide instructions
- Show format

Example 3.17 - Input text placeholder - Example 3.17 (Without Styles) |
<h4>Placeholder Text</h4><p>Used to give instructions:</p><form action="https://cscie12.dce.harvard.edu/echo" method="post" enctype="application/x-www-form-urlencoded"><input size="30" name="search" type="text" placeholder="What can we help you find?"/><input class="searchSubmit" value="Search" type="submit"/></form><hr/><p>Used to show format:</p><form action="https://cscie12.dce.harvard.edu/echo" method="post" enctype="application/x-www-form-urlencoded"><p><label for="expiration">Expiration:</label><input id="expiration" name="expiration" type="text" placeholder="MMYY"/><br/><input type="submit"/></p></form>input.searchSubmit { background: url('http://cscie12.dce.harvard.edu/resources/./images/magnifier12.png') no-repeat; width: 16px; height: 16px; border: none; margin-left: 2px; text-indent: -9999em;}

- Markup
- Style
- Display

    <h4>Placeholder Text</h4><p>Used to give instructions:</p>
    <form action="https://cscie12.dce.harvard.edu/echo" method="post">

    <input size="30" name="search" type="text" placeholder="What can we help you find?"/>
    <input class="searchSubmit" value="Search" type="submit"/>
    </form>
    <hr/><p>Used to show format:</p>
    <form action="https://cscie12.dce.harvard.edu/echo" method="post">
    <p><label for="expiration">Expiration:</label>
    <input id="expiration" name="expiration" type="text" placeholder="MMYY"/><br/>
    <input type="submit"/></p>

    </form>

In `style` element (`<style type="text/css">`) within `head` element:

    input.searchSubmit {
        background: url('./images/magnifier12.png') no-repeat;
        width: 16px;
        height: 16px;
        border: none;
        margin-left: 2px;
        text-indent: -9999em;}

#### Placeholder Text

Used to give instructions:

Used to show format:

Expiration:

Magnifier icon made by SimpleIcon from www.flaticon.com is licensed by CC BY 3.0

## HTML5: Autofocus

Autofocus will bring the "focus" of the cursor to that field when the page loads. Typically, you would bring focus to the first input field of the form.

XML syntax:

    <input type="text" autofocus="autofocus" name="q"/>

HTML syntax:

    <input type="text" autofocus name="q">

Example 3.18 - Input autofocus property - Example 3.18 | Example 3.18 JSFiddle

- Markup
- Screenshot

    <form action="https://cscie12.dce.harvard.edu/echo" method="post">
    <fieldset><legend>Autofocus</legend><p>The following field should "autofocus":</p>
    <p>Name:
    <input size="50" name="name" type="text" autofocus="autofocus"/></p>
    </fieldset><p>
    <input type="submit"/></p>

    </form>

## HTML5: email and url

On handheld devices, screen keyboard is optimized for input.

### type="email"

Example 3.19 - text input for email - Example 3.19 |
<form action="https://cscie12.dce.harvard.edu/echo" method="post" enctype="application/x-www-form-urlencoded"><fieldset><legend>Email</legend><p>Email: <input type="email" name="email_address" size="50"/></p></fieldset><p><input type="submit"/></p></form>

- Markup
- Display
- Screenshot

    <form action="https://cscie12.dce.harvard.edu/echo" method="post">
    <fieldset><legend>Email</legend><p>Email:
    <input type="email" name="email_address" size="50"/></p>
    </fieldset><p>
    <input type="submit"/></p>

    </form>

Email

Email:

### type="url"

Example 3.20 - text input for URLs - Example 3.20 |
<form action="https://cscie12.dce.harvard.edu/echo" method="post" enctype="application/x-www-form-urlencoded"><fieldset><legend>URL</legend><p>URL: <input type="url" name="url" size="50"/></p></fieldset><p><input type="submit"/></p></form>

- Markup
- Display
- Screenshot

    <form action="https://cscie12.dce.harvard.edu/echo" method="post">
    <fieldset><legend>URL</legend><p>URL:
    <input type="url" name="url" size="50"/></p>
    </fieldset><p>
    <input type="submit"/></p>

    </form>

URL

URL:

## HTML5: number and range

Example 3.21 - HTML5 input type='number' and type='range' - Example 3.21 |
<form action="https://cscie12.dce.harvard.edu/echo" method="post" enctype="application/x-www-form-urlencoded"><p>Number:<br/><input type="number" name="n"/></p><p>Range from 1 to 10, increments of 1:<br/><input type="range" min="1" max="10" step="1" name="r"/></p><p><input type="submit"/></p></form>

- Markup
- Display
- Screenshot

    <form action="https://cscie12.dce.harvard.edu/echo" method="post">
    <p>Number:<br/>
    <input type="number" name="n"/></p>
    <p>Range from 1 to 10, increments of 1:<br/>
    <input type="range" min="1" max="10" step="1" name="r"/></p>
    <p>
    <input type="submit"/></p>

    </form>

Number:

Range from 1 to 10, increments of 1:

## HTML5: date and time

Example 3.22 - HTML5 input types for date and time - Example 3.22 | Example 3.22 JSFiddle

- Markup
- Display
- Screenshot

    <form action="https://cscie12.dce.harvard.edu/echo" method="post">
    <fieldset><legend>Date and Time</legend><p>Date</p>
    <p>
    <input type="date" name="my_date"/></p>
    <p>Datetime-local</p>
    <p>
    <input type="datetime-local" name="my_datetime"/></p>
    <p>Time</p>
    <p>15 minute steps:
    <input type="time" name="my_time_15" step="900" value="12:00"/></p>
    <p>1 minute steps:
    <input type="time" name="my_time_1" step="60" value="12:00"/></p>
    <p>1 second steps:
    <input type="time" name="my_time_1s" step="1" value="12:00"/></p>
    </fieldset><p>
    <input type="submit"/></p>

    </form>

Date and Time

Date

Datetime-local

Time

15 minute steps:

1 minute steps:

1 second steps:

## Tables

See: Tabular Data from HTML5 Specification

### Uses of Tables

- Data
- Layout

### Table Elements

`table` , `caption` , `colgroup` , `col` , `tbody` , `thead` , `tfoot` , `tr` , `td` , `th`

Example 3.23 - Table - Example 3.23 | Example 3.23 JSFiddle

- Markup
- Display

    <table>
    <caption>A table</caption>
    <tr>
    <th>Column 1</th>
    <th>Column 2</th>
    <th>Column 3</th>
    </tr>
    <tr>
    <td>row 1 column 1</td>
    <td>row 1 column 2</td>
    <td>row 1 column 3</td>
    </tr>
    <tr>
    <td>row 2 column 1</td>
    <td>row 2 column 2</td>
    <td>row 2 column 3</td>
    </tr>
    <tr>
    <td>row 3 column 1</td>
    <td>row 3 column 2</td>
    <td>row 3 column 3</td>
    </tr>
    </table>

A table
Column 1 | Column 2 | Column 3
--- | --- | ---
row 1 column 1 | row 1 column 2 | row 1 column 3
row 2 column 1 | row 2 column 2 | row 2 column 3
row 3 column 1 | row 3 column 2 | row 3 column 3

## A Simple Table

Data from the US Census Bureau

Example 3.24 - Simple data table - Example 3.24 | Example 3.24 JSFiddle

- Markup
- Display

    <p>United States Urban and Rural Populations</p>
    <table>
    <tr>
    <td>Year</td>
    <td>Percent Urban</td>
    <td>Percent Rural</td>
    </tr>
    <tr>
    <th>2010</th>
    <td>80.3</td>
    <td>19.7</td>
    </tr>
    <tr>
    <th>2000</th>
    <td>79.2</td>
    <td>20.8</td>
    </tr>
    <tr>
    <th>1950</th>
    <td>64.0</td>
    <td>36.0</td>
    </tr>
    <tr>
    <th>1900</th>
    <td>39.6</td>
    <td>60.4</td>
    </tr>
    <tr>
    <th>1850</th>
    <td>15.4</td>
    <td>84.6</td>
    </tr>
    <tr>
    <th>1800</th>
    <td>6.1</td>
    <td>93.9</td>
    </tr>
    </table>
    <p>Data from<a href="http://www.census.gov/">United States Census Bureau</a></p>

United States Urban and Rural Populations

Year | Percent Urban | Percent Rural
2010 | 80.3 | 19.7
2000 | 79.2 | 20.8
1950 | 64.0 | 36.0
1900 | 39.6 | 60.4
1850 | 15.4 | 84.6
1800 | 6.1 | 93.9

Data from United States Census Bureau

## Adding thead, tfoot, tbody, caption, and summary

Example 3.25 - Advanced Table - Example 3.25 | Example 3.25 JSFiddle

- Markup
- Display

    <table summary="This table shows the percentage of the United States population that lived in urban and rural areas from 1800 to 2000.">
    <caption>United States Urban and Rural Populations</caption>
    <thead>
    <tr>
    <th>Year</th>
    <th>Percent Urban</th>
    <th>Percent Rural</th>
    </tr>
    </thead>
    <tfoot>
    <tr>
    <td colspan="3">Data from<a href="http://www.census.gov/">United States Census Bureau</a></td>
    </tr>
    </tfoot><tbody>
    <tr>
    <th>2010</th>
    <td>80.3</td>
    <td>19.7</td>
    </tr>
    <tr>
    <th>2000</th>
    <td>79.2</td>
    <td>20.8</td>
    </tr>
    <tr>
    <th>1950</th>
    <td>64.0</td>
    <td>36.0</td>
    </tr>
    <tr>
    <th>1900</th>
    <td>39.6</td>
    <td>60.4</td>
    </tr>
    <tr>
    <th>1850</th>
    <td>15.4</td>
    <td>84.6</td>
    </tr>
    <tr>
    <th>1800</th>
    <td>6.1</td>
    <td>93.9</td>
    </tr>
    </tbody>
    </table>

United States Urban and Rural Populations
Year | Percent Urban | Percent Rural
--- | --- | ---
Data from United States Census Bureau
2010 | 80.3 | 19.7
2000 | 79.2 | 20.8
1950 | 64.0 | 36.0
1900 | 39.6 | 60.4
1850 | 15.4 | 84.6
1800 | 6.1 | 93.9

## Benefits of Semantics

Semantics lets us selectively manipulate parts of the table -- whether for style or function.

## Using "col" and "colgroup"

`col` and `colgroup` elements can be used to as a way to apply styles (style or class attribute) to columns.

Example 3.26 - 'colgroup' element - Example 3.26 | Example 3.26 JSFiddle

- Markup
- Display

    <table>
    <caption>United States Urban and Rural Populations</caption>
    <colgroup span="1">
    <col span="1" style="background-color: lightsalmon;"/>
    <col span="2" style="background-color: wheat;"/>
    </colgroup>
    <thead>
    <tr>
    <th scope="col">Year</th>
    <th scope="col">Percent Urban</th>
    <th scope="col">Percent Rural</th>
    </tr>
    </thead>
    <tbody>
    <tr>
    <th scope="row">2010</th>
    <td>80.3</td>
    <td>19.7</td>
    </tr>
    <tr>
    <th scope="row">2000</th>
    <td>79.2</td>
    <td>20.8</td>
    </tr>
    <tr>
    <th scope="row">1950</th>
    <td>64.0</td>
    <td>36.0</td>
    </tr>
    <tr>
    <th scope="row">1900</th>
    <td>39.6</td>
    <td>60.4</td>
    </tr>
    <tr>
    <th scope="row">1850</th>
    <td>15.4</td>
    <td>84.6</td>
    </tr>
    <tr>
    <th scope="row">1800</th>
    <td>6.1</td>
    <td>93.9</td>
    </tr>
    </tbody>
    </table>

United States Urban and Rural Populations
Year | Percent Urban | Percent Rural
--- | --- | ---
2010 | 80.3 | 19.7
2000 | 79.2 | 20.8
1950 | 64.0 | 36.0
1900 | 39.6 | 60.4
1850 | 15.4 | 84.6
1800 | 6.1 | 93.9

## Accessibilty of Tables

### Using "scope"

The "scope" attribute can be used to associate header information with columns and rows (and also column groups and row groups).

Example 3.27 - Table with 'scope' attribute - Example 3.27 | Example 3.27 JSFiddle

- Markup
- Display

    <table>
    <caption>United States Urban and Rural Populations</caption>
    <thead>
    <tr>
    <th scope="col">Year</th>
    <th scope="col">Percent Urban</th>
    <th scope="col">Percent Rural</th>
    </tr>
    </thead>
    <tfoot>
    <tr>
    <td colspan="3">Data from<a href="http://www.census.gov/">United States Census Bureau</a></td>
    </tr>
    </tfoot><tbody>
    <tr>
    <th scope="row">2010</th>
    <td>80.3</td>
    <td>19.7</td>
    </tr>
    <tr>
    <th scope="row">2000</th>
    <td>79.2</td>
    <td>20.8</td>
    </tr>
    <tr>
    <th scope="row">1950</th>
    <td>64.0</td>
    <td>36.0</td>
    </tr>
    <tr>
    <th scope="row">1900</th>
    <td>39.6</td>
    <td>60.4</td>
    </tr>
    <tr>
    <th scope="row">1850</th>
    <td>15.4</td>
    <td>84.6</td>
    </tr>
    <tr>
    <th scope="row">1800</th>
    <td>6.1</td>
    <td>93.9</td>
    </tr>
    </tbody>
    </table>

United States Urban and Rural Populations
Year | Percent Urban | Percent Rural
--- | --- | ---
Data from United States Census Bureau
2010 | 80.3 | 19.7
2000 | 79.2 | 20.8
1950 | 64.0 | 36.0
1900 | 39.6 | 60.4
1850 | 15.4 | 84.6
1800 | 6.1 | 93.9

## Accessibility using "headers"

The "headers" attribute can also be used to associate header information with columns and rows. This is typically used in more complicated tables.

id attribute. Note the use of the "id" attribute. This is an attribute that can be applied to most any HTML element. Values for "id" must be unique throughout the document.

The value of "headers" is a space-separated list of IDREFS (references to "id" names in the document).

Example 3.28 - Table with 'headers' attribute - Example 3.28 |
<table><caption>United States Urban and Rural Populations</caption><thead><tr><th id="year" rowspan="1" colspan="1">Year</th><th id="urban" rowspan="1" colspan="1">Percent Urban</th><th id="rural" rowspan="1" colspan="1">Percent Rural</th></tr></thead><tfoot><tr><td colspan="3" rowspan="1">Data from <a href="http://www.census.gov/">United States Census Bureau</a></td></tr></tfoot><tbody><tr><th id="y2010" headers="year" rowspan="1" colspan="1">2010</th><td headers="y2010 urban" rowspan="1" colspan="1">80.3</td><td headers="y2010 rural" rowspan="1" colspan="1">19.7</td></tr><tr><th id="y2000" headers="year" rowspan="1" colspan="1">2000</th><td headers="y2000 urban" rowspan="1" colspan="1">79.2</td><td headers="y2000 rural" rowspan="1" colspan="1">20.8</td></tr><tr><th id="y1950" headers="year" rowspan="1" colspan="1">1950</th><td headers="y1950 urban" rowspan="1" colspan="1">64.0</td><td headers="y1950 ruran" rowspan="1" colspan="1">36.0</td></tr><tr><th id="y1900" headers="year" rowspan="1" colspan="1">1900</th><td headers="y1900 urban" rowspan="1" colspan="1">39.6</td><td headers="y1900 rural" rowspan="1" colspan="1">60.4</td></tr><tr><th id="y1850" headers="year" rowspan="1" colspan="1">1850</th><td headers="y1850 urban" rowspan="1" colspan="1">15.4</td><td headers="y1850 rural" rowspan="1" colspan="1">84.6</td></tr><tr><th id="y1800" headers="year" rowspan="1" colspan="1">1800</th><td headers="y1800 urban" rowspan="1" colspan="1">6.1</td><td headers="y1800 rural" rowspan="1" colspan="1">93.9</td></tr></tbody></table>

- Markup
- Display

    <table>
    <caption>United States Urban and Rural Populations</caption>
    <thead>
    <tr>
    <th id="year">Year</th>
    <th id="urban">Percent Urban</th>
    <th id="rural">Percent Rural</th>
    </tr>
    </thead>
    <tfoot>
    <tr>
    <td colspan="3">Data from<a href="http://www.census.gov/">United States Census Bureau</a></td>
    </tr>
    </tfoot><tbody>
    <tr>
    <th id="y2010" headers="year">2010</th>
    <td headers="y2010 urban">80.3</td>
    <td headers="y2010 rural">19.7</td>
    </tr>
    <tr>
    <th id="y2000" headers="year">2000</th>
    <td headers="y2000 urban">79.2</td>
    <td headers="y2000 rural">20.8</td>
    </tr>
    <tr>
    <th id="y1950" headers="year">1950</th>
    <td headers="y1950 urban">64.0</td>
    <td headers="y1950 ruran">36.0</td>
    </tr>
    <tr>
    <th id="y1900" headers="year">1900</th>
    <td headers="y1900 urban">39.6</td>
    <td headers="y1900 rural">60.4</td>
    </tr>
    <tr>
    <th id="y1850" headers="year">1850</th>
    <td headers="y1850 urban">15.4</td>
    <td headers="y1850 rural">84.6</td>
    </tr>
    <tr>
    <th id="y1800" headers="year">1800</th>
    <td headers="y1800 urban">6.1</td>
    <td headers="y1800 rural">93.9</td>
    </tr>
    </tbody>
    </table>

United States Urban and Rural Populations
Year | Percent Urban | Percent Rural
--- | --- | ---
Data from United States Census Bureau
2010 | 80.3 | 19.7
2000 | 79.2 | 20.8
1950 | 64.0 | 36.0
1900 | 39.6 | 60.4
1850 | 15.4 | 84.6
1800 | 6.1 | 93.9

## What can we do now that relationship is clear?

Once semantic markup is in place, adding function with JavaScript becomes much easier. For example, we can write some JavaScript to highlight the column/row headings based on the presence of `scope` or `headers` attributes.

Live Example of Table Highlighting

## Section-level elements

HTML5 defines elements that can be used to represent sections (`New to HTML5`):

- `body` - represents the main content of the document
- `article` - represents a self-contained composition within a document
- `section` - a generic section of a document
- `nav` - represents a section with navigation links
- `aside` - tangentially related (analagous to a sidebar for printed material)
- `h1`, `h2`, `h3`, `h4`, `h5`, `h6` - headings for sections
- `hgroup` - used to group a set of headings
- `header` - represents a group of introductory or navigational aids
- `footer` - represents a footer for its section
- `address` - represents contact informatin

See: Usage Summary for Section Elements

## Parts of a Page

- `body`
- `header`
- `footer`
- `nav`

### header

### footer

### nav

## Presentation - Cascading Style Sheets (CSS)

## Markup, Presentation, Function

- Structure / Markup (HTML, XHTML)
  - Structure
  - Content
- Style / Presentation (CSS)
  - Style
  - Presentation
  - Appearance
- Function (Javascript)
  - Actions
  - Manipulations

solarsystem-markup.html

solarsystem-style.html

solarsystem.html

Files:

- solarsystem.css
- jquery-1.4.2.min.js
- jquery.mousewheel-3.0.2.pack.js
- jquery.fancybox-1.3.1.js
- jquery.fancybox-1.3.1.css
- fancybox.png
- fancybox-x.png
- fancybox-y.png
- blank.gif

## Styles

The markup page references an external stylesheet document.

    <!DOCTYPE html>
    <html>
      <head>
        <title>Our Solar System</title>
        <!-- the link element is used to reference a stylesheet -->
        <link rel="stylesheet" href="solarsystem.css" type="text/css"/>
        ...cut...

The CSS file contains style rules for the document (solarsystem.css)

Contents of the CSS file:

    @import url(js/fancybox/jquery.fancybox-1.3.1.css);

    body {
      margin-left: 10%;
      margin-top: 1em;
      margin-right: 10%;
      background: #ffd;
      font-family: Calibri,Arial,sans-serif;
    }
    h1 {
      font-family: Calibri,Arial, sans-serif;
      color: #333;
      border-bottom: thin dotted black;
    }
    ul.gallery {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    ul.gallery li {
      margin-top: 1em;
      font-size: 1.25em;
      height: 170px;
      width: 150px;
      float: left;
      text-align: center;
      border: thin dotted black;
      margin: 10px;
      padding: 10px;
    }
    ul.gallery li img { border: none; }
    p.credits {
      clear: both;
      border: none;
      margin-top: 20px;
      padding: 1em;
      font-size: smaller;
    }
    a:link,a:visited {text-decoration: none; color: blue; }
    a:hover { text-decoration: underline; }
    a:active { border: none; text-decoration: none; }

## Different Styles for The United States Constitution

- United States Constitution (no external stylesheet)

W3C Core Styles applied to the US Constitution.

- Chocolate Stylesheet
- Midnight Stylesheet
- Modernist Stylesheet
- Oldstyle Stylesheet
- Steely Stylesheet
- Swiss Stylesheet
- Traditional Stylesheet
- Ultramarine Stylesheet

## Harvard Summer School

Harvard Summer School 2011 | With CSS disabled:

## CSS Zen Garden

css Zen Garden: The Beauty in CSS Design. A demonstration of what can be accomplished visually through CSS-based desgin.

## Responsive Web Design

- Responsive Web Design by Ethan Marcotte on A List Apart
- Live Example

## CSS Recommendations from the W3C

- CSS 1, December 1996; Revised January 1999)
- CSS 2, May 1998
- CSS 2.1, June 2011
- CSS 2.2, September 2015
- CSS Current Work (CSS level 3)

### CSS Validator

W3C CSS Validation Service
`http://jigsaw.w3.org/css-validator/`

## CSS Mechanics - rules and selectors

- Rules
- Selectors

## Anatomy of a CSS Rule

### CSS Rule

### Selector and Declarations

### Properties and Values

## Simple CSS Example

Example 3.29 - Simple CSS Example - Example 3.29 (Without Styles) |
<p> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p>p { color: red; background-color: blue; }

- Markup
- Style
- Screenshot

     <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>

In `style` element (`<style type="text/css">`) within `head` element:

    p {
        color: red;
        background-color: blue;
      }

## CSS Mechanics - Binding Styles to Markup

Three ways to bind CSS rules to HTML markup:

- `style` attribute in element
- `<style>` element in HTML head
- External CSS document, through the `<link>` element in HTML head

## style attribute

Example 3.30 - style attribute - Example 3.30 |
<p style="color: black; background-color: teal; padding: 1em; font-family: helvetica, sans-serif; text-align: justify; margin: 2em;"> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p>

- Markup
- Display
- Screenshot

    <p style="color: black; background-color: teal; padding: 1em; font-family: helvetica, sans-serif; text-align: justify; margin: 2em;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.

## style element

Example 3.31 - style element - Example 3.31 (Without Styles) |
<p> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p>p { color: black; background-color: teal; padding: 1em; font-family: helvetica, sans-serif; text-align: justify; margin: 2em; }

- Markup
- Style
- Screenshot

    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>

In `style` element (`<style type="text/css">`) within `head` element:

    p {
        color: black;
        background-color: teal;
        padding: 1em;
        font-family: helvetica, sans-serif;
        text-align: justify;
        margin: 2em;
      }

So the full page looks like:

     <html>
       <head>
         <title>CSCIE-12 CSS Example</title>
         <style type="text/css">
          p {
             color: black;
             background-color: teal;
             padding: 1em;
             font-family: helvetica, sans-serif;
             text-align: justify;
             margin: 2em;
          }
         </style>
       </head>
       <body>
         <p>
          Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec
          facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit.
          Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante
          sit amet urna. Maecenas condimentum hendrerit turpis.
         </p>
      </body>
    </html>

## link element

The link element can reference an external stylesheet.
Example 3.32 - link element for stylesheets - Example 3.32 (Without Styles) |
<p> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p>p { color: black; background-color: teal; padding: 1em; font-family: helvetica, sans-serif; text-align: justify; margin: 2em; }

- Markup
- Style
- Screenshot

    <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>

In `head` element:

    <link rel="stylesheet" type="text/css" href="example32.css"/>

In example32.css

    p {
        color: black;
        background-color: teal;
        padding: 1em;
        font-family: helvetica, sans-serif;
        text-align: justify;
        margin: 2em;
      }

The full source:

    <html>
       <head>
         <title>CSCIE-12 CSS Example</title>
         <link href="example37.css" type="text/css" rel="stylesheet"/>
       </head>
       <body>
         <p>
          Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec
          facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit.
          Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante
          sit amet urna. Maecenas condimentum hendrerit turpis.
         </p>
      </body>
    </html>

## Combining Rules

Rules can be combined. The following two sets of style rules would produce identical results. Rules can be listed separately:

    p {color: black;}
    p {background-color: teal;}
    p {padding: 1em;}
    p {margin: 1em;}
    p {font-family: helvetica, sans-serif;}
    p {text-align: justify;}

Or, rules can be grouped. Property:Value pairs need to be separated by a semicolon.

    p {
         color: black;
         background-color: teal;
         padding: 1em;
         margin: 1em;
         font-family: helvetica, sans-serif;
         text-align: justify;
    }

## Combining Selectors

Selectors can be combined into comma-separated groups.

    h1 { color: maroon; }
    h2 { color: maroon; }
    h3 { color: maroon; }
    h4 { color: maroon; }
    h5 { color: maroon; }
    h6 { color: maroon; }

We combine the selectors so that a single declaration applies to multiple selectors.

    h1, h2, h3, h4, h5, h6 { color: maroon; }

## Basic Selectors - elements, class, id

- elements
- class/id

### element selectors

    p {
      background-color: white;
      color: maroon;
    }

    ul {
      border: medium solid green;
    }

    li {
      background-color: lightsalmon;
    }

    h1,
    h2,
    h3 {
      background-color: black;
      color: white;
    }

CSS element selector example

## class selectors

The class and id attributes of HTML elements can be used in conjunction with styles.

Class names are referenced in CSS as `.classname`, and may or may not have an element name preceding the period (`.classname` or `element.classname`.

Likewise, id names are referenced in CSS as `#idref`, and may or may not have an element name preceding the period (`#idref` or `element#idref`.

Example 3.33 - classes - Example 3.33 (Without Styles) |
<div>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div class="withstyle">Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</div><div class="warn">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div>Lorem ipsum dolor sit amet, <span class="warn">consectetuer adipiscing elit</span>. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div id="legalese">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div>div { background-color: white; color: black; font-family: times; margin: 0.5em; padding: 0.5em; } div.withstyle { background-color: olive; color: navy; font-family: sans-serif; margin: 0.5em; padding: 0.5em; } .warn { background-color: yellow; color: red; font-weight: bold; } #legalese { color: #cccccc; font-size: 0.6em; }

- Markup
- Style
- Screenshot

    <div>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div class="withstyle">Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</div><div class="warn">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div>Lorem ipsum dolor sit amet,<span class="warn">consectetuer adipiscing elit</span>. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div id="legalese">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div>

In `style` element (`<style type="text/css">`) within `head` element:

    div
    {
      background-color: white;
      color: black;
      font-family: times;
      margin: 0.5em;
      padding: 0.5em;
    }
    div.withstyle
    {
      background-color: olive;
      color: navy;
      font-family: sans-serif;
      margin: 0.5em;
      padding: 0.5em;
    }
    .warn
    {
      background-color: yellow;
      color: red;
      font-weight: bold;
    }
    #legalese
    {
      color: #cccccc;
      font-size: 0.6em;
    }

## id selectors

id names are referenced in CSS as `#idref`, and may or may not have an element name preceding the period (`#idref` or `element#idref`.

Example 3.34 - id selectors - Example 3.34 (Without Styles) |
<div id="header"> put in header information here </div><div id="main"><!-- main content --> Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </div><div id="footer"> put in footer information here </div> #main { background-color: blue; color: white; border-color: green; border-width: thick; border-style: solid; }

- Markup
- Style
- Screenshot

     <div id="header">put in header information here</div><div id="main"><!-- main content -->Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</div><div id="footer">put in footer information here</div>

In `style` element (`<style type="text/css">`) within `head` element:

        #main {
                background-color: blue;
                color: white;
                border-color: green;
                border-width: thick;
                border-style: solid;
        }

## Contextual Selectors

`selector1 selector2 { ...rules... }`

Example 3.35 - contextual selectors - Example 3.35 (Without Styles) |
<div><em>Emphasized text</em> outside of <strong>li</strong> appear "normal". <ul><li><em>Emphasized text</em> within <strong>li</strong> have a different style. </li></ul></div> li em { color: red; background-color: navy;}

- Markup
- Style
- Screenshot

     <div><em>Emphasized text</em>outside of<strong>li</strong>appear "normal".<ul>
    <li><em>Emphasized text</em>within<strong>li</strong>have a different style.</li>
    </ul></div>

In `style` element (`<style type="text/css">`) within `head` element:

    li em { color: red; background-color: navy;}

## CSS Properties and Values

CSS Level 1 lists 53 properties that let you style properties of:

- font
- color
- text
- boxes (border, padding, margins)
- classification (inline, block, list)

CSS Level 2.1 lists 115 properties.

### CSS Properties

CSS Level 1 lists 53 properties. Font Properites font-family font-style font-variant font-weight font-size font Color and Background Properties color background-color background-image background-repeat background-attachment background-position background Text Properties word-spacing letter-spacing text-decoration vertical-align text-transform text-align text-indent line-height Box Properties margin-top margin-right margin-bottom margin-left margin padding-top padding-right padding-bottom padding-left padding border-top-width border-right-width border-bottom-width border-left-width border-width border-color border-style border-top border-right border-bottom border-left border width height float clear display Classification Properties white-space list-style-type list-style-image list-style-position list-style | CSS Level 2.1 lists 115 properties. azimuth background background-attachment background-color background-image background-position background-repeat border border-bottom border-bottom-color border-bottom-style border-bottom-width border-collapse border-color border-left border-left-color border-left-style border-left-width border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-style border-top-width border-width bottom caption-side clear clip color content counter-increment counter-reset cue cue-after cue-before cursor direction display elevation empty-cells float font font-family font-size font-style font-variant font-weight height left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width min-height min-width orphans outline outline-color outline-style outline-width overflow padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside pause pause-after pause-before pitch pitch-range play-during position quotes richness right speak speak-header speak-numeral speak-punctuation speech-rate stress table-layout text-align text-decoration text-indent text-transform top unicode-bidi vertical-align visibility voice-family volume white-space widows width word-spacing z-index

## Inheritance

Properties are typically inherited by children elements.
Example 3.36 - Styles and inheritance - Example 3.36 (Without Styles) |
<div> Lorem ipsum dolor sit amet, <em>consectetuer adipiscing elit</em>. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. <ul><li>Lorem</li><li>Ipsum</li><li>Dolor</li></ul></div><p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p><ul><li>Lorem</li><li>Ipsum</li><li>Dolor</li></ul>body { color: navy; } em { color: red; } div { color: green; }

- Markup
- Style
- Screenshot

     <div>Lorem ipsum dolor sit amet,<em>consectetuer adipiscing elit</em>. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.<ul>
    <li>Lorem</li>
    <li>Ipsum</li>
    <li>Dolor</li>
    </ul></div><p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>
    <ul>
    <li>Lorem</li>
    <li>Ipsum</li>
    <li>Dolor</li>
    </ul>

In `style` element (`<style type="text/css">`) within `head` element:

    body { color: navy; }
    em { color: red; }
    div { color: green; }

## Sample "UA" default stylesheets for HTML 2.0 and HTML 4.0

UA = User-Agent = HTTP Client = Web Browser

Take a look at the sample default stylesheets for HTML 2.0 and HTML 4.0 listed in the Appendices of the CSS1 and CSS2 Recommendations.

- Sample style sheet for HTML 2.0 [Local copy]
- Default style sheet for HTML 4.0 [Local copy]

### HTML 4 Sample default CSS

    html, address,
    blockquote,
    body, dd, div,
    dl, dt, fieldset, form,
    frame, frameset,
    h1, h2, h3, h4,
    h5, h6, noframes,
    ol, p, ul, center,
    dir, hr, menu, pre   { display: block }
    li              { display: list-item }
    head            { display: none }
    table           { display: table }
    tr              { display: table-row }
    thead           { display: table-header-group }
    tbody           { display: table-row-group }
    tfoot           { display: table-footer-group }
    col             { display: table-column }
    colgroup        { display: table-column-group }
    td, th          { display: table-cell; }
    caption         { display: table-caption }
    th              { font-weight: bolder; text-align: center }
    caption         { text-align: center }
    body            { margin: 8px; line-height: 1.12 }
    h1              { font-size: 2em; margin: .67em 0 }
    h2              { font-size: 1.5em; margin: .75em 0 }
    h3              { font-size: 1.17em; margin: .83em 0 }
    h4, p,
    blockquote, ul,
    fieldset, form,
    ol, dl, dir,
    menu            { margin: 1.12em 0 }
    h5              { font-size: .83em; margin: 1.5em 0 }
    h6              { font-size: .75em; margin: 1.67em 0 }
    h1, h2, h3, h4,
    h5, h6, b,
    strong          { font-weight: bolder }
    blockquote      { margin-left: 40px; margin-right: 40px }
    i, cite, em,
    var, address    { font-style: italic }
    pre, tt, code,
    kbd, samp       { font-family: monospace }
    pre             { white-space: pre }
    button, pre,
    input, object,
    select          { display:inline-block; }
    big             { font-size: 1.17em }
    small, sub, sup { font-size: .83em }
    sub             { vertical-align: sub }
    sup             { vertical-align: super }
    table           { border-spacing: 2px; }
    thead, tbody,
    tfoot           { vertical-align: middle }
    td, th          { vertical-align: inherit }
    s, strike, del  { text-decoration: line-through }
    hr              { border: 1px inset }
    ol, ul, dir,
    menu, dd        { margin-left: 40px }
    ol              { list-style-type: decimal }
    ol ul, ul ol,
    ul ul, ol ol    { margin-top: 0; margin-bottom: 0 }
    u, ins          { text-decoration: underline }
    br:before       { content: "\A" }
    :before, :after { white-space: pre-line }
    center          { text-align: center }
    abbr, acronym   { font-variant: small-caps; letter-spacing: 0.1em }
    :link, :visited { text-decoration: underline }
    :focus          { outline: thin dotted invert }

    /* Begin bidirectionality settings (do not change) */
    BDO[DIR="ltr"]  { direction: ltr; unicode-bidi: bidi-override }
    BDO[DIR="rtl"]  { direction: rtl; unicode-bidi: bidi-override }

    *[DIR="ltr"]    { direction: ltr; unicode-bidi: embed }
    *[DIR="rtl"]    { direction: rtl; unicode-bidi: embed }

    @media print {
      h1            { page-break-before: always }
      h1, h2, h3,
      h4, h5, h6    { page-break-after: avoid }
      ul, ol, dl    { page-break-before: avoid }
    }

### HTML 2 Sample default CSS

    BODY {
      margin: 1em;
      font-family: serif;
      line-height: 1.1;
      background: white;
      color: black;
    }

    H1, H2, H3, H4, H5, H6, P, UL, OL, DIR, MENU, DIV,
    DT, DD, ADDRESS, BLOCKQUOTE, PRE, BR, HR, FORM, DL {
      display: block }

    B, STRONG, I, EM, CITE, VAR, TT, CODE, KBD, SAMP,
    IMG, SPAN { display: inline }

    LI { display: list-item }

    H1, H2, H3, H4 { margin-top: 1em; margin-bottom: 1em }
    H5, H6 { margin-top: 1em }
    H1 { text-align: center }
    H1, H2, H4, H6 { font-weight: bold }
    H3, H5 { font-style: italic }

    H1 { font-size: xx-large }
    H2 { font-size: x-large }
    H3 { font-size: large }

    B, STRONG { font-weight: bolder }  /* relative to the parent */
    I, CITE, EM, VAR, ADDRESS, BLOCKQUOTE { font-style: italic }
    PRE, TT, CODE, KBD, SAMP { font-family: monospace }

    PRE { white-space: pre }

    ADDRESS { margin-left: 3em }
    BLOCKQUOTE { margin-left: 3em; margin-right: 3em }

    UL, DIR { list-style: disc }
    OL { list-style: decimal }
    MENU { margin: 0 }              /* tight formatting */
    LI { margin-left: 3em }

    DT { margin-bottom: 0 }
    DD { margin-top: 0; margin-left: 3em }

    HR { border-top: solid }        /* 'border-bottom' could also have been used */

    A:link { color: blue }          /* unvisited link */
    A:visited { color: red }        /* visited links */
    A:active { color: lime }        /* active links */

    /* setting the anchor border around IMG elements
       requires contextual selectors */

    A:link IMG { border: 2px solid blue }
    A:visited IMG { border: 2px solid red }
    A:active IMG { border: 2px solid lime }

## font properties

- font-family
- font-style
- font-variant
- font-weight
- font-size
- font

## font-family

    body {
      font-family: garamond, times, serif;
    }

Example 3.37 - font properties - Example 3.37 |
<div style="font-family: garamond, times, serif;">Garamond, Times, or serif (generic family)</div><div style="font-family: calibri, arial, helvetica, sans-serif;">Calibri, Arial, Helvetica or sans-serif (generic family)</div><div style="font-family: lucida console, courier, monospace;">Lucida Console, Courier or monospace (generic family)</div><div style="font-family: fantasy;">Fantasy (generic family)</div><div style="font-family: cursive;">Cursive (generic family)</div>

- Markup
- Display
- Screenshot

    <div style="font-family: garamond, times, serif;">Garamond, Times, or serif (generic family)</div><div style="font-family: calibri, arial, helvetica, sans-serif;">Calibri, Arial, Helvetica or sans-serif (generic family)</div><div style="font-family: lucida console, courier, monospace;">Lucida Console, Courier or monospace (generic family)</div><div style="font-family: fantasy;">Fantasy (generic family)</div><div style="font-family: cursive;">Cursive (generic family)</div>

Garamond, Times, or serif (generic family)
Calibri, Arial, Helvetica or sans-serif (generic family)
Lucida Console, Courier or monospace (generic family)
Fantasy (generic family)
Cursive (generic family)

## font-style

    em {
      font-style: italic;
    }

Example 3.38 - font-style - Example 3.38 |
<div style="font-style: normal;">Normal font-style</div><div style="font-style: italic;">Italic font-style</div><div style="font-style: oblique;">Oblique font-style</div>

- Markup
- Display

    <div style="font-style: normal;">Normal font-style</div><div style="font-style: italic;">Italic font-style</div><div style="font-style: oblique;">Oblique font-style</div>

Normal font-style
Italic font-style
Oblique font-style

## font-variant and font-weight

### font-variant

Example 3.39 - font-weight and font-variant - Example 3.39 |
<div style="font-variant: small-caps;">This should be rendered in small-caps. <div style="font-variant: normal;">Here we revert to "normal". </div></div>

- Markup
- Display

    <div style="font-variant: small-caps;">This should be rendered in small-caps.<div style="font-variant: normal;">Here we revert to "normal".</div></div>

This should be rendered in small-caps.
Here we revert to "normal".

### font-weight

    strong {
      font-weight: bold;
    }

values: normal | bold | bolder | lighter | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900
Example 3.40 - font-weight - Example 3.40 |
<div> font-weight can be used to make <span style="font-weight: bold">text appear bold</span>. </div>

- Markup
- Display

    <div>font-weight can be used to make<span style="font-weight: bold">text appear bold</span>.</div>

font-weight can be used to make text appear bold.

## font-size

Example 3.41 - font-size - Example 3.41 |
<div style="font-size: 8pt;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div style="font-size: 120%;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div style="font-size: 1.5em;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div>

- Markup
- Display
- Screenshot

    <div style="font-size: 8pt;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div style="font-size: 120%;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div><div style="font-size: 1.5em;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.</div>

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci.

## Font Sizes: Relative vs. Absolute

As a general guideline with CSS, relative measurements are better than absolute measurements.

- Relative
  - Relative to UA settings:
    `xx-small | x-small | small | medium | large | x-large | xx-large`
  - `rem` - relative to the html em (root em)
  - Relative to context:
    `larger | smaller`
  - Percentage (%)
  - "em" units
- Absolute
  - "pt" sizes (8pt, 10pt, 12pt)

## font

In CSS, there are various shorthand properties; these allow you to define several properties in a single place.

The font shorthand property allows you to set:
`[font-style | font-variant | font-weight ]? font-size[/line-height]? font-family`

Example 3.42 - font shorthand - Example 3.42 (Without Styles) |
<div>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </div>body { font: normal normal normal x-large/200% arial, helvetica, sans-serif; }

- Markup
- Style
- Screenshot

     <div>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</div>

In `style` element (`<style type="text/css">`) within `head` element:

    body {
          font: normal normal normal x-large/200% arial, helvetica, sans-serif;
    }

## text properties

- word-spacing
- letter-spacing
- text-decoration
- vertical-align
- text-transform
- text-align
- text-indent
- line-height

Align blocks of text left, right, center, and justified.

Example 3.43 - text properties - Example 3.43 |
<div style="margin-left: 30%; margin-right: 30%;"><p style="text-align: left">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p><p style="text-align: center">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p><p style="text-align: right">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p><p style="text-align: justify">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p></div>

- Markup
- Display
- Screenshot

    <div style="margin-left: 30%; margin-right: 30%;"><p style="text-align: left">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>
    <p style="text-align: center">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>
    <p style="text-align: right">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>
    <p style="text-align: justify">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>
    </div>

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.

Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.

## CSS Values and Units

- Length
  em, pt, ex, mm, cm, in, px
  e.g. `1.0em`
- Percentage
  e.g.`10%`
- URL
  url(url goes here)
  e.g. `url('../images/banner.png')`
- Color
  name, hexadecimal, rgb value
  e.g.
  - name
    - `aqua`
  - hexadecimal
    - `#ffd`
    - `#60ae9f`
  - rgb (percent or numeric)
    - `rgb(24,50,255)`
    - `rgb(5%,20%,75%)`

## Color Units

Wikipedia Web Colors

### Name

As defined in HTML: aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, yellow

### RGB Color Space

256 colors in each channel (Red, Green, Blue). Values can be

- decimal numbers (0 to 255)
- hexadecimal numbers (00 to ff)
- percentages (0 to 100%)

The following are all equivalent ways of defining a shade of orange:

rgb(100%,66%,33%) rgb(255,168,84) #ffa854 |

Example 3.44 - Example 3.44 |
<div style="background-color: rgb(100%,66%,33%); padding: 1em; ; margin: 1em;"> Lorem ipsum dolor sit amet, consectetuer adipiscing elit.<br/>rgb(100%,66%,33%) </div><div style="background-color: #ffa854; padding: 1em; margin: 1em; "> Lorem ipsum dolor sit amet, consectetuer adipiscing elit.<br/>#ffa854 </div><div style="background-color: rgb(255,168,84); padding: 1em; ; margin: 1em;"> Lorem ipsum dolor sit amet, consectetuer adipiscing elit.<br/>rgb(255,168,84) </div>

- Markup
- Display

    <div style="background-color: rgb(100%,66%,33%); padding: 1em; ; margin: 1em;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit.<br/>rgb(100%,66%,33%)</div><div style="background-color: #ffa854; padding: 1em; margin: 1em; ">Lorem ipsum dolor sit amet, consectetuer adipiscing elit.<br/>#ffa854</div><div style="background-color: rgb(255,168,84); padding: 1em; ; margin: 1em;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit.<br/>rgb(255,168,84)</div>

Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
rgb(100%,66%,33%)
Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
#ffa854
Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
rgb(255,168,84)

## Colorpicker

- HTML Color Picker from W3Schools
- DIY - `<input type="color" />`
Color Picker

Select Color:
Hex value:

## Tools: Your Browser

And a few that aren't listed at BrowseHappy.com:

- Brave
- Firefox Quantum (Developer Edition)
- Vivaldi
- Maxthon

## Web Browsers and Layout Engines

Web Browser | Layout Engine
--- | ---
Google Chrome | Blink (fork of Webkit)
Apple Safari | Webkit
Mozilla Firefox | Gecko
Microsoft | EdgeHTML (Edge) Trident (IE)
Opera | Blink (fork of Webkit)

### A mostly internal-facing Harvard site

## Firefox

## Firebug Firefox Developer Tools for Firefox

Note that Firebug functionality is now incorporated directly into Firefox. See: Firefox Developer Tools.

Access Developer Tools using the Firefox menu and then select "Developer"

## Google Chrome: Developer Tools

## Internet Explorer: Developer Tools

## Safari: Web Inspector

Safari Web Inspector - Getting Started
Safari → Preferences → Advanced → Show Develop menu in menu bar

## Testdrive Your Browser

Example 3.45 - Test Drive Your Browser - Example 3.45 (Without Styles) |
<h1>Lorem Ipsum Dolor</h1><p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis. </p><ul><li>Lorem</li><li>Ipsum</li><li>Dolor</li></ul>body { background-color: silver; font-family: calibri, arial, helvetica, sans-serif; } p { line-height: 200%; border: thin solid black; padding: 1em; margin: 2em; background-color: teal; } ul { border: medium dotted red; background-color: yellow; font-family: Times New Roman, Times, serif; } h1 { color: purple; background-color: white; font-variant: small-caps; }

- Markup
- Style

     <h1>Lorem Ipsum Dolor</h1><p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Cras sollicitudin, orci nec facilisis vehicula, neque urna porta risus, ut sagittis enim velit at orci. Fusce velit. Integer sapien enim, rhoncus vitae, cursus non, commodo vitae, felis. Nulla convallis ante sit amet urna. Maecenas condimentum hendrerit turpis.</p>
    <ul>
    <li>Lorem</li>
    <li>Ipsum</li>
    <li>Dolor</li>
    </ul>

In `style` element (`<style type="text/css">`) within `head` element:

    body {
      background-color: silver;
      font-family: calibri, arial, helvetica, sans-serif;
    }
    p {
      line-height: 200%;
      border: thin solid black;
      padding: 1em;
      margin: 2em;
      background-color: teal;
      }
    ul {
      border: medium dotted red;
      background-color: yellow;
      font-family: Times New Roman, Times, serif;
    }
    h1 {
      color: purple;
      background-color: white;
      font-variant: small-caps;
    }

## Tools: JS Fiddle

JS Fiddle Example

jsfiddle.net

Copyright © David Heitmeyer