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Test Info:

<!DOCTYPE html>
<html>
<script>
window.onload=function(){
var e=document.createElement("q");
document.documentElement.appendChild(e);
e.style="mask-image:url(data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=),url(data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)";
setTimeout(function(){
e.style="mask-image:url(data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=)";
},0);
};
</script>
</html>