Comments
Comment tags are used to insert non-renderable text in the HTML source code. The browser ignores all text inside comments and does not have any effect on webpage visual.
<!--
is used to initiate comment and -->
is used to end comment. Kindly note that there is an exclamation mark ! in the beginning tag of comment but it doesn't exist in the closing tag. To disable rendering of any HTML tag you can put that code inside comment tag.