Does HTML5 use new tags not supported by HTML4?

video/ogg, video/mp4 and video/webm are all examples of:

Which of the following web browser doesn't support the muted attribute of <video> element?

Aside tags are useful for...

Which HTML5 tag would most semantically group a page title (in an H1 tag) and tagline (in an H2 tag)?

A HTML5 SSE allow a web page to _________

Select the valid attributes of audio element. (choose all that apply)

Which is the HTML element used to create the clickable text? When clicked on, the cursor should be focused on the input field.

Select the valid HTML elements that can embed content to an HTML document. (choose all that apply)

Select all valid input types:

Which file will be displayed if a computer has all required codecs?