Tests which characters can be used before a protocol relative URL within an HTML style attribute.
<div id=x style="background:url($[chr]//fuzz.shazzer.co.uk/$[rand]?$[i]#)">test</div>0x0D
<div id=x style="background:url(0x09//fuzz.shazzer.co.uk/9fsb739pbj?9#)">test</div>0x0D
<div id=x style="background:url(
//fuzz.shazzer.co.uk/00djee22vf7s6?10#)">test</div>0x0D
<div id=x style="background:url(0x0C//fuzz.shazzer.co.uk/1y8ibt6dugo?12#)">test</div>0x0D
<div id=x style="background:url(0x0D//fuzz.shazzer.co.uk/lfmktqurwg9?13#)">test</div>0x0D
<div id=x style="background:url( //fuzz.shazzer.co.uk/rr02qdvv7p?32#)">test</div>0x0D
<div id=x style="background:url('//fuzz.shazzer.co.uk/b2utfniby5w?39#)">test</div>0x0D
<div id=x style="background:url(///fuzz.shazzer.co.uk/5aih0iw18yq?47#)">test</div>0x0D
<div id=x style="background:url(\//fuzz.shazzer.co.uk/sol6oth3xhb?92#)">test</div>0x0D
<div id=x style="background:url(0x09//fuzz.shazzer.co.uk/epjijvfpw8a?9#)">test</div>0x0D
<div id=x style="background:url(
//fuzz.shazzer.co.uk/xzwlhcm7yl8?10#)">test</div>0x0D
<div id=x style="background:url(0x0C//fuzz.shazzer.co.uk/rhmy1upqw9r?12#)">test</div>0x0D
<div id=x style="background:url(0x0D//fuzz.shazzer.co.uk/dqbaf0mkc7?13#)">test</div>0x0D
<div id=x style="background:url( //fuzz.shazzer.co.uk/xihg7nsgzul?32#)">test</div>0x0D
<div id=x style="background:url('//fuzz.shazzer.co.uk/s7p3q98ab58?39#)">test</div>0x0D
<div id=x style="background:url(///fuzz.shazzer.co.uk/lhyzoo61hq?47#)">test</div>0x0D
<div id=x style="background:url(\//fuzz.shazzer.co.uk/lk4cmux8m6?92#)">test</div>0x0D