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Before URL protocol relative characters

Tests which characters can be used before a protocol relative URL within an HTML style attribute.

Shazzer Master

Created byhackvertor

Created Aug 27, 2026

Updated Sep 5, 2026

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CategoryCSS Parsing

VisibilityPublic

TypeXSS

CharsetUTF-8

Template used:

<div id=x style="background:url($[chr]//fuzz.shazzer.co.uk/$[rand]?$[i]#)">test</div>

Sample payloads

<div id=x style="background:url(0x09//fuzz.shazzer.co.uk/zn27jdrdbss?9#)">test</div>

<div id=x style="background:url(
//fuzz.shazzer.co.uk/lnd8eostel?10#)">test</div>

<div id=x style="background:url(0x0C//fuzz.shazzer.co.uk/szglsg5rkiq?12#)">test</div>

<div id=x style="background:url(
//fuzz.shazzer.co.uk/bpoggiw7zzm?13#)">test</div>

<div id=x style="background:url( //fuzz.shazzer.co.uk/6whkkrdrjhv?32#)">test</div>

<div id=x style="background:url('//fuzz.shazzer.co.uk/hek4vnws9v?39#)">test</div>

<div id=x style="background:url(///fuzz.shazzer.co.uk/8nz4ptg9bat?47#)">test</div>

<div id=x style="background:url(\//fuzz.shazzer.co.uk/gq8ucvfc25j?92#)">test</div>

<div id=x style="background:url(0x09//fuzz.shazzer.co.uk/3bzrgxjmsy3?9#)">test</div>

<div id=x style="background:url(
//fuzz.shazzer.co.uk/ompxi73f21?10#)">test</div>

<div id=x style="background:url(0x0C//fuzz.shazzer.co.uk/x5brzgrguq?12#)">test</div>

<div id=x style="background:url(
//fuzz.shazzer.co.uk/uym5s8ralid?13#)">test</div>

<div id=x style="background:url( //fuzz.shazzer.co.uk/n2stx4xlmxd?32#)">test</div>

<div id=x style="background:url('//fuzz.shazzer.co.uk/o76led0fqnq?39#)">test</div>

<div id=x style="background:url(///fuzz.shazzer.co.uk/64hxjaqqbmx?47#)">test</div>

<div id=x style="background:url(\//fuzz.shazzer.co.uk/6mr6iyqx0jc?92#)">test</div>

<div id=x style="background:url(0x09//fuzz.shazzer.co.uk/ur4vwl6w4a?9#)">test</div>

<div id=x style="background:url(
//fuzz.shazzer.co.uk/pmkkegcsi3?10#)">test</div>

<div id=x style="background:url(0x0C//fuzz.shazzer.co.uk/3xrbi166n99?12#)">test</div>

<div id=x style="background:url(
//fuzz.shazzer.co.uk/9nn0c96jm4o?13#)">test</div>