HTML Comments

You can add comments to your HTML source by using the following syntax:

<!-- Write your comments here -->

Notice that there is an exclamation point (!) in the start tag, but not in the end tag.

Note: Comments are not displayed by the browser, but they can help document your HTML source code.

HTML comments are a way to add notes or explanations to your HTML code that are not visible on the rendered webpage. 

Here are some key points to keep in mind when using HTML comments:

➠ Comment syntax: HTML comments start with <!-- and end with -->. Any text between these delimiters will be treated as a comment and will not be displayed on the webpage.

➠ Purpose: Comments are used to provide additional information about the code for other developers who may read it in the future. They can also be used to temporarily disable a piece of code without actually deleting it.

➠ Location: Comments can be placed anywhere in the HTML code, including between tags, within attributes, or at the beginning or end of the file.

➠ Nesting: HTML comments cannot be nested inside each other. If you want to add a comment within a comment, you will need to close the first comment before starting the second one.

➠ Best practices: When using comments, it's important to keep them concise and relevant. Overusing comments or writing long, rambling comments can actually make the code harder to read and understand.

➠ Accessibility: Because comments are not visible on the webpage, they do not affect accessibility. However, if you use comments to hide important information, such as alt text for images, it can make your site less accessible for people who use assistive technology.

Overall, HTML comments are a useful tool for providing additional information and context for your code, but they should be used sparingly and thoughtfully.