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<!DOCTYPE HTML>
<html>
<head>
<title>FontFaceSet::Load crasher</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<style type="text/css">

body {
  margin: 50px;
}

p {
  margin: 0;
  font-size: 300%;
}

</style>

</head>
<body>

<p>This may crash on load...</p>

<script>
var scriptText = `
  var fontFaceSet = document.fonts;
  var link = document.createElement("link");
  link.onerror = link.onload = function() {
    fontFaceSet.load("12px foo");
  }
  link.rel = "stylesheet";
  link.href = "data:text/css,";
  document.body.appendChild(link);
`;

var styleText = `
  @font-face {
    font-family: foo;
    src: url("data:text/ttf,");
  }
`;

var ifr = document.createElement("iframe");
document.body.appendChild(ifr);
var style = ifr.contentDocument.createElement("style");
style.textContent = styleText;
ifr.contentDocument.body.appendChild(style);
var script = ifr.contentDocument.createElement("script");
script.textContent = scriptText;
ifr.contentDocument.body.appendChild(script);
ifr.remove();
</script>
</body>
</html>