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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style id="s">
@font-face {
font-family: x;
src: url(bogus-font.ttf);
}
@font-face {
font-family: y;
src: url(bogus-font.ttf);
}
</style>
<script>
function boom()
{
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
ctx.font = 'normal 20px x';
document.getElementById("s").remove();
setTimeout(function() {
ctx.measureText("A");
}, 50);
}
window.addEventListener("DOMContentLoaded", boom)
</script>
</head>
<body><div style="font-family: y;">y</div></body>
</html>
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