chromium/third_party/blink/web_tests/fast/css/font-face-zero-hash-key.html

<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
<style>
    @font-face {
        font-family: test;
        src: url(../../resources/Ahem.ttf);
    }
</style>
<p>
    Test for an assertion failure when specifying a 0 size for a remote font.
</p>
<p style="font-family: test; font-size: 0;">
    Invisible text.
</p>