JavaScript and DOM

• getElementById
• getElementsByTagName
• querySelector lets us use "CSS selector" syntax and grab the "first" occurence (so you always get a "single" item).
• querySelectorAll lets us use "CSS selector" syntax and grab the "all" occurences (so you get a "list" of things).
• getAttribute and setAttribute
• classList and add, remove, toggle
• Various DOM methods to create nodes and add to the node tree (not today!)