,true,false]–> is perfectly correct, so if your comments are not working, it is usually caused by a hidden syntax error, a software conflict, or a misunderstanding of how comments behave in specific coding environments.
Here is a troubleshooting checklist to help you fix the issue quickly. 1. Check for Spaces and Typo Errors
The HTML comment syntax is very strict. Small spacing errors will break the entire tag.
No space after the first exclamation: is correct. < !– comment –> or <! – comment –> will fail.
Do not use double dashes inside: Putting – inside your comment text (e.g., ) can confuse older browsers or strict parsers. 2. Verify Your File Extension
HTML comments only work inside files that the server or browser recognizes as HTML.
Ensure file ends in .html or .htm: If you are accidentally writing inside a .css or .js file, will cause a syntax error. CSS files use: /comment / JavaScript files use: // comment or / comment / 3. Server-Side Framework Conflicts
If you are working with a modern web framework, standard HTML comments might behave unexpectedly.
React (JSX): HTML comments do not work inside JSX. You must use {/ comment */} instead.
Vue / Angular: Standard HTML comments work, but they might be automatically stripped out during the production build phase to reduce file size. Check your build settings.
PHP / Back-End: If your comment wraps around active PHP code (like ), the PHP code may still execute on the server before the HTML is sent to the browser. 4. Code Editor and Extension Glitches
Sometimes the code is fine, but your environment is lying to you.
Check syntax highlighting: If the text inside the comment does not change color (usually turning gray or green), your text editor isn’t recognizing the tag.
Unclosed tags above: If you forgot to close an HTML tag (like a