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Invalid selector characters - Shazzer

Invalid selector characters

⚠ Browser differences

This vector uses an import inside a CSS string to test which characters cause an invalid CSS selector.

Shazzer Master

Created Aug 6, 2026

Updated Aug 6, 2026

Unable to render tweet button

Detecting browser...

CategoryCSS Parsing

VisibilityPublic

TypeXSS

CharsetUTF-8

Template used:

<style>0x0D
$[chr]{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

Code used after fuzz:

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

Sample payloads

Hide older browsersShowing 2 of 3

⚠Chrome 151.0.7922.75 desktop Linux

Updated7 Aug 2026

Found 66 results

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⚠Firefox 153.0 desktop Linux

Updated7 Aug 2026

Found 1 result

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<style>0x0D
0x01{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x02{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x03{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x04{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x05{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x06{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x07{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x08{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x09{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D

{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x0B{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x0C{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x0D{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x0E{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x0F{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x10{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x11{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x12{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x13{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>

<style>0x0D
0x14{position:"⟦0D⟧
}@import'data:text/css,%23x{color:red}';⟦0D⟧
</style>0x0D
<div id="x">test</div>