If you're someone who's found themselves knee deep in HTML, you'll know that even this so called "not a programming" language has comments. They're pretty obvious:
<!-- this is a comment in HTML -->
That's it. There's no other way to write comments in HTML. Well...
OK, so officially <!-- comment --> is how comments should be written. But the specification will turn your HTML into a comment at the drop of a hat.
Let's have a look at the many and varied ways that parser errors should result in comments!
1. Not dashing enough
<!--> and <!--->
2. Too much bang for your buck
<!-- comment --!>
3. My hyphen key broke
<! whatever or <! whatever > (yes, it can even end with the EOF)
4. You can question my comments
<?whatever etc. or <?whatever etc.>
5. I don't think you should be here
<![CDATA[whatever]]> (this only applies in "non-foreign" content)
6. It started so well
<!-- comment (EOF in comment)
7. This script is too short
<script><!-- comment (EOF in script)
8. Learn the rules of tag
<666></666> (opening part is treated as text, the closing part is a comment)
On top of all those non-comment comments, a final extra quirk: the second --> in <!-- <!-- I wish I could nest comments --> --> is treated as mark up!
men shoes