What is the role of the <dfn> element in HTML5?

How do you make an input tag checked? You add:

What does the <details> tag do?

True or False: You can't put divs in HTML5 footer tags.

Does HTML5 use new tags not supported by HTML4?

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

Which statement is correct about Server-Side image maps?

Which value of Socket.readyState is an attribute of WebSocket indicating that the connection is going through the closing handshake?

Which method is used to check if the browser can play the specified audio/video type?

Which attribute can be specified on any HTML element? (choose all that apply)

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