How many CSS type selectors are commonly used?

Which HTML element groups related content together?

How can we create a horizontal line in HTML?

Identify which one is not a phrase tag among the following HTML tags:

What are the units that can be used with the font-size property?

Which of the following are valid CSS font-size keyword values?

The ___________ of an item is the value of its element's itemid attribute.

Arrange the following components to form a correct web structure:

The root element of an XHTML document must be html, and must contain which attribute to associate it with the XHTML namespace?

The :first-of-type CSS pseudo-class represents the first element of its type among a group of sibling elements.