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What do the different colors in older html website code represent (red & blue)?

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WHAT IS THE COLOR CODE OF MOZILLA IN THE PAGE INFO WINDOW - view-source. When looking at page coding in basic HTML 5 (4 transitional), what do the different colors mean? Especially RED! Blue too. Now it is obvious that this is "deprecated" HTML code, however, SINCE THE SITE IS DISPLAYING WHAT IS PROGRAMMED - is it that important? No CSS or other programming (frames, padding, etc. etc.) / Using old windows XP OS, which they will have to pry from cold dead fingers, but that is unrelated to this question

WHAT IS THE COLOR CODE OF MOZILLA IN THE PAGE INFO WINDOW - view-source. When looking at page coding in basic HTML 5 (4 transitional), what do the different colors mean? Especially RED! Blue too. Now it is obvious that this is "deprecated" HTML code, however, SINCE THE SITE IS DISPLAYING WHAT IS PROGRAMMED - is it that important? No CSS or other programming (frames, padding, etc. etc.) / Using old windows XP OS, which they will have to pry from cold dead fingers, but that is unrelated to this question

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Is this a general question about the View Source pane, or about a specific website?

I don't know whether this post from 2011 is still the latest news, but you might want to start here: https://hsivonen.fi/view-source/

That was linked from here: https://developer.mozilla.org/docs/Tools/View_source