firefox-main/dom/security/test/general/file_clobbered_property.html (file symbol)

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<!DOCTYPE html>
<html>
<head>
<title>Test DOM clobbering telemetry</title>
<meta charset="UTF-8">
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/GleanTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<img src="https://example.org/1" name="id">
<img src="https://example.org/2" name="foo">
<!-- Clobber the built-in property -->
<img src="https://example.org/3" name="currentScript">
<img src="https://example.org/4" name="onreadystatechange">
<img src="https://example.org/5" name="hasFocus">
<script>
console.log(document.id);
console.log(document.foo);
console.log(document.currentScript);
console.log(document.onreadystatechange);
console.log(document.hasFocus);
</script>
<form>
<input id="bar">
<input id="attributes">
</form>
<script>
let form = document.querySelector("form");
console.log(form.bar);
console.log(form.attributes);
</script>
</body>
</html>