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In View Page Source, what do the font colors mean?

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It appears that HTML errors are shown in red, and HTML comments in green. But, what does the orange mean? Any other colors? And, why is the DocType always in red?

It appears that HTML errors are shown in red, and HTML comments in green. But, what does the orange mean? Any other colors? And, why is the DocType always in red?

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organgy-red- seems to be a symbol ex: & purple are html tag names blue is just stuff in quotes green is stuff that is commented out

However I do not see any errors in red in my example. But, the red color only means that it's a bit special and the red color makes it easier to see. It does not mean that it's an error.