,true,true]–> . However, developers often run into situations where a comment fails to work, breaks the layout, or unexpectedly displays on the live webpage.
If your HTML comments are not working, it is almost always due to one of four common syntax mistakes. 1. Spaces Inside the Opening Syntax
The opening tag of an HTML comment must be a single, unbroken string of characters.
The Error: Placing a space between the exclamation point and the dashes (e.g., < !– or <! –).
The Fix: Ensure there are absolutely no spaces inside the opening bracket. It must always be or using dashes to create a visual divider line like .
The Fix: Browsers can misinterpret double dashes as the signal to end the comment early. Use asterisks * or tildes ~ instead of dashes for visual separators. 3. Nested Comments HTML does not support nesting one comment inside another. The Error:
–> Use code with caution.
The Fix: When the browser reads the first closing –> (even if it belongs to an inner comment), it considers the entire comment block closed. The remaining code will leak onto the page. To disable large blocks of code containing inner comments, temporarily delete the inner comments first. 4. Wrong Comment Syntax for the Language
HTML files often contain other languages like CSS (inside