<!--...--> is the comment tag used to insert comments in the source code.
This construct encloses text comments that will not be displayed by the browser.
The comment may be used for informational messages for developers.
We can also use comment to mask content from user agents that do not support a particular technology.
No attributes or events are associated with this construct.
The comment tag does not support any standard attributes.
The comment tag does not support any event attributes.
<!DOCTYPE html> <html> <body> <!-- This is a comment --> <p>This is a paragraph.</p> </body> </html>