Comment can't contain that content
52312
"What have you tried" epidemic
33752
Why is there a comment in my inbox that doesn't exist?
153027
Quoting someones comment in own answer
49430
"Add/show 1 other comment" bug strikes again
104802
Don't count non-printing characters, HTML comments or other content not displayed toward minimum character requirements
36073
@ symbol not allowed more than once on comments
74183
The comment pop-up is too far away
68751
Unable to post any answer or comment with UNION - ALL
113721
Why comment reply auto-completion feature (@) sometimes doesn't work?
32621
You can make a mostly empty comment/post using link Markdown
66356
Can I place a comment inside a tag in ASP.NET?
124089
Commenting out a few words within a paragraph?
69723
Occasionally, the Unicode character sequence U+200C U+200B (ZWNJ ZWSP) is inserted into comments
58940
Why can't the  tag contain a  tag inside it?
32317
Code Formating in Comments
70875
Comment flags are broken
51469
Allow converting comments to answers