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Commenting in your HTML code: why and how.
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[C]ommenting is a good habit to get into as it helps you fix problems later. — Ian Lloyd
You can leave comments to yourself, or the users who want to poke around in your code, simply by using the following format:
<!--here's my comment-->
Use this sparingly. For one, a bunch of comments eat up bandwidth and slow loading time for your pages; for another, using them improperly can “break” your page.
You’ve seen a good example, now here’s two bad examples. Don’t write your comments like these!
<!-------------Wow, what a lot of hyphens! Bet the browser chokes on them------------->
<!--This hyphenated comment in the middle---might also cause the browser to choke-->
So when will you use comments? I use them to indicate instances in my code where some large, complex chunk of code is beginning or ending. Or, as Ian Lloyd tells us, they are useful for keeping those pesky DIV tags straight:
</div><!-- end of inner div --> </div><!-- end of nested div --> </div><!-- end of outer div -->
Designers often use HTML comments to "deactivate" problem chunks of code, to see if they can isolate problems in their HTML. If you think a piece of code is causing your design to throw a hairball, you can do something like this to isolate it:
<!-- Problem code troublesome code -->
with the possibly flawed code contained in between. You can display the page with the “deactivated” code in your browser and see if the problem continues to appear with the particular piece of code “turned off.”