Web colors hexadecimal notation

Question

Usually colors in hexadecimal notation are presented with a hashtag following 6 hexadecimal characters. What color does the value #AAA produce? Are the other characters derived from the existing ones? Are the missing values just assumed?

Answer 1

#AAA is interpreted as #AAAAAA

When you have 3-hexadecimal colour, the browser is assuming that every single char (or number) gets doubled (so e.g. #ABC is equivalent to #AABBCC)