Some web developers also place comments in the source code of their work to help make it easy for people to understand the code.

HTML comments in the source code of a document appear as <!– your comment here –>. They can be viewed if someone types views the source code of a document, but do not appear in the regular formatted HTML rendered version of a document.

In the past some SEOs would stuff keywords in comment tags to help increase the page keyword density, but search has evolved beyond that stage, and at this point using comments to stuff keywords into a page adds to your risk profile and presents little ranking upside potential.

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