Which of the following html tag isn't supported in HTML5?

Which HTML5 tag would be best for wrapping the date of a blog post?

If there are multiple <source> element inside a <video> element. Browser will display the video of:

<rt> is used to define:

According to the W3C HTML5 specification, which one of these may the <time> element NOT represent?

In which order would these cache manifest events be fired?

Which statement is correct for a blockquote?

Which is a new input type introduced in HTML5?

Which is not a core method of WebSQL Database API?

Which code is valid?

Which statement is considered as best practices?