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What does red-color characters means in HTML code?

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Victor.Ye
Victor.Ye
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I right-click on the webpage in the Firefox browser, and click on "view source code". Then I see the HTML source code. Some characters are in red color. I wonder what is means. Why dos the red-color characters mean? Does it mean that the source code is error in grammer? I don't think so. But the slash in the label
is in red color. I wonder what is happening.

I right-click on the webpage in the Firefox browser, and click on "view source code". Then I see the HTML source code. Some characters are in red color. I wonder what is means. Why dos the red-color characters mean? Does it mean that the source code is error in grammer? I don't think so. But the slash in the label <br /> is in red color. I wonder what is happening.