The ____ attribute can be used to identify where to download a plug-in.

If an element contains 12pt text, a length of 2em equals ____.

_____ units express font size according to the size of other objects within a web page.

Hypertext markup language (html) version _____ added interactive elements, including web forms.

The uniform resource locator (url) for a phone link is _____.

Use the ______ tag to associate a web page with an external style sheet.

Which of the following sizes the width of a table to half of its containing object?

Which of the following is not a valid html tag?

Which of the following is not a valid HTML element tag?

Which attribute of the HTML <A> tag specifies the address of the destination link?

Which tag doesn't form a table or a container for table elements?