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characters allowed between exclamation mark and greater then

Chrome logo 1
Firefox logo 1
Edge logo 1

Testing characters that still close a HTML comment

InsertScript
Created byInsertScript
Created Jun 18, 2024
Updated May 28, 2025

Tweet
Detecting browser...
CategoryHTML Parsing
VisibilityPublic
TypeHTML
CharsetUTF-8
Template used:
<!----!$[chr]><found>

Sample payloads

<!----!>><img/src/onerror=alert(1)>

Fuzz results

Chrome logo
Chrome 145.0.0.0 desktop Windows NT 10.0
Updated16 Feb 2026
Found 1 result
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Chrome logo
Chrome 144.0.0.0 desktop Linuxolder version
Updated16 Feb 2026
Found 1 result
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Firefox logo
Firefox 147.0 desktop Linux
Updated1 Feb 2026
Found 1 result
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Edge logo
Microsoft Edge 145.0.0.0 desktop Windows NT 10.0
Updated18 Feb 2026
Found 1 result
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