Why does HTML think “chucknorris” is a color?

Question

How come certain random strings produce colors when entered as background colors in HTML? For example:

Answer 1

I'm sorry to disagree, but according to the rules for parsing a legacy color value posted by @Yuhong Bao, chucknorris DOES NOT equate to #CC0000, but rather to #C00000, a very similar but slightly different hue of red. I used the Firefox ColorZilla add-on to verify this.

The rules state:

• make the string a length that is a multiple of 3 by adding 0s: chucknorris0
• separate the string into 3 equal length strings: chuc knor ris0
• truncate each string to 2 characters: ch kn ri
• keep the hex values, and add 0's where necessary: C0 00 00

I was able to use these rules to correctly interpret the following strings:

• LuckyCharms
• Luck
• LuckBeALady
• LuckBeALadyTonight
• GangnamStyle

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UPDATE: The original answerers who said the color was #CC0000 have since edited their answers to include the correction.