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Test Info:

<style>
:not(svg) { -webkit-mask: url(#x); }
</style>
<script>
function go() {
a.style.setProperty("content", "url(")
a.style.setProperty("position", "fixed")
a.style.setProperty("display", "-webkit-inline-flex")
a.style.setProperty("filter", "brightness(")
}
</script>
<body onload=go()>
<link id="a">x</link>