Comment Interface
A comment is used to add notations within markup; although it is generally not displayed, it is still available to be read in the source view (in Firefox: View -> Page Source). These are represented in HTML and XML as content between <!-- and --> . In XML, the character sequence "--" cannot be used within a comment.
A comment has no special properties or methods of its own, but inherits those of CharacterData (which inherits from Node).
Extends
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