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HTML tag localName differences

Finds which characters get transformed in localName

Shazzer Master

Created byhackvertor

Created Aug 25, 2026

Updated Aug 25, 2026

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CategoryHTML Parsing

VisibilityPublic

TypeXSS

CharsetUTF-8

Template used:

<x$[chr] id=x>

Code used after fuzz:

let localName = x.localName;0x0D
let compareTag = "x" + String.fromCodePoint($[i]);0x0D
localName !== compareTag && log($[i])

Sample payloads

<x0x00 id=x>

<x0x09 id=x>

<x
 id=x>

<x0x0C id=x>

<x0x0D id=x>

<x  id=x>

<x/ id=x>

<xA id=x>

<xB id=x>

<xC id=x>

<xD id=x>

<xE id=x>

<xF id=x>

<xG id=x>

<xH id=x>

<xI id=x>

<xJ id=x>

<xK id=x>

<xL id=x>

<xM id=x>