What is the correct HTML for referring to an external style sheet?

What does CSS stand for?

Which character, followed by the selector's name, is used for defining ID selectors?

Which symbol is used to define an ID?

What should CSS be used for?

Where in an HTML document is the correct place to refer to an external style sheet?

Which selector is used to select the paragraph element that is a direct descendent of section?

Which answer is an example of a type selector (also sometimes referred to as an element selector)?

Pseudo-classes are used to _.

Which choice is not a valid transition?

How can you create a semi-transparent background color?