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chromium/third_party/blink/web_tests/http/tests/serviceworker/resources/css-import-crash-iframe.html 

<!DOCTYPE html>
<head>
<script>
var style = document.createElement('style');
style.textContent = "@import url('css-import-crash.css');";
document.head.appendChild(style);
document.head.removeChild(style);
window.onload = function(){ parent.done('Pass'); };
</script>
<head>