HTML5
116 elements defined in HTML5
    
More information: HTML5 Living Standard from the WHATWG. Section 4 contains the List of elements in HTML.
I've highlighted the 24 elements that you will use and/or see most commonly.
- The root element- html
 
- Document metadata
    - head
- title
- base
- link
- meta
 
- Style- style
 
- Sections
    - body
- article
- section
- nav
- aside
- h1,- h2,- h3,- h4,- h5,- h6
- hgroup
- header
- footer
- address
 
- Grouping content
    - p
- hr
- pre
- blockquote
- ol
- ul
- li
- dl
- dt
- dd
- figure
- figcaption
- main
- div
 
- Text-level semantics- a
- em
- strong
- small
- s
- cite
- q
- dfn
- abbr
- ruby
- rt
- rp
- data
- time
- code
- var
- samp
- kbd
- sub
- sup
- i
- b
- u
- mark
- bdi
- bdo
- span
- br
- wbr
 
- Edits- ins
- del
 
- Embedded content- picture
- source
- img
- iframe
- embed
- object
- param
- video
- audio
- source
- track
- map
- area
 
- Tabular data- table
- caption
- colgroup
- col
- tbody
- thead
- tfoot
- tr
- td
- th
 
- Forms- form
- label
- input
- button
- select
- datalist
- optgroup
- option
- textarea
- output
- progress
- meter
- fieldset
- legend
 
- Interactive elements- details
- summary
- menu
- dialog
 
- Scripting- script
- noscript
- template
- canvas
- slot