Characters before CSS property names

⚠ Browser differences

This vector shows which characters are allowed before a CSS property name

Shazzer Master

Created Aug 6, 2026

Updated Aug 6, 2026

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CategoryCSS Parsing

VisibilityPublic

TypeXSS

CharsetUTF-8

Template used:

<div id=x style="$[chr]color:red">test</div>0x0D

Code used after fuzz:

window.getComputedStyle(x).color === 'rgb(255, 0, 0)' && log($[i])

Sample payloads

<div id=x style="0x09color:red">test</div>0x0D

<div id=x style="
color:red">test</div>0x0D

<div id=x style="0x0Ccolor:red">test</div>0x0D

<div id=x style="0x0Dcolor:red">test</div>0x0D

<div id=x style=" color:red">test</div>0x0D

<div id=x style=";color:red">test</div>0x0D

<div id=x style="}color:red">test</div>0x0D