1/ Targets elements based on attribute names or values.

Element selector

Attribute selector

Property selector

Value selector

2/ Consists of the elements text and border.

Background of an element

Style of an element

Color of an element

Foreground of an element

3/ Selectors that insert implied or fictional elements into the document for styling.

Element selector

pseudo-element selector

pseudo-class selector

Property selector

4/ A color model that mixes colors from Red, Green, and Blue light. With 256 shades of light in each channel, this color model is capable of creating millions of colors.

HSL Color Model

RGB Color Model