Which web browser does not support the loop attribute of < video > element?

Which of the following is not included in controls attribute in < video > element?

Which event will the browser fire after checking all files in the cache manifest for updates, and finding several files that need to be updated?

How should you create a link for your website allowing users to email the webmaster if the webmaster’s email address is webmaster@xcompany.com?

<keygen> tag element is new in HTML5.

What does the action attribute in a <form> element do?

What is the <!DOCTYPE> declaration in HTML5?

What does 'id' stands for?

An <article> can contain <section> elements.

Which of the following is true after the browser fires an `updateready` event?

Which of the following is incorrect to set the loop attribute of <video> element in HTML5?