CSS Property value types
by Afnan Al-Subaihin
1. Percentage
2. URL
3. Color
3.1. Color Names
3.2. RGB
3.3. Hex
4. Keyword
5. Number
6. Length
6.1. Approximate Measures
6.1.1. in
6.1.2. cm
6.1.3. mm
6.1.4. pt
6.1.5. pc
6.2. Relative Length Values
6.2.1. em
6.2.2. ex