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chromium
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chromium/third_party/blink/web_tests/fast/css/font-face-css-change-while-loading-expected.html 

<!DOCTYPE html>
<style id="sheet">
@font-face {
    font-family: myahem;
    src: url(../../resources/Ahem.ttf);
}
</style>
<p>You should see a black rectangle below.</p>
<div style="font-family: myahem">FAIL</div>