css/css-font-loading/fontfaceset-has.html

<!DOCTYPE html>
<html>
<head id="head">
<meta charset="utf-8">
<link rel="author" title="Myles C. Maxfield" href="mmaxfield@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-font-loading-3/#dom-fontfaceset-has">
<meta name="assert" content="Ensure that calling FontFaceSet.has() works properly." />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id="style">
@font-face {
    font-family: "WebFont";
    src: url("resources/Rochester.otf") format("opentype");
}
</style>
</head>
<body>
<script>
test(function(t) {
    let fonts = document.fonts;
    let font = [...fonts.keys()][0];
    let font2 = new FontFace("WebFont2", "url('resources/GenR102.woff2') format('woff2')");
    assert_true(fonts.has(font));
    assert_false(fonts.has(font2));
    fonts.add(font2);
    assert_true(fonts.has(font));
    assert_true(fonts.has(font2));
    document.getElementById("head").removeChild(document.getElementById("style"));
    assert_false(fonts.has(font));
    assert_true(fonts.has(font2));
    fonts.delete(font2);
    assert_false(fonts.has(font));
    assert_false(fonts.has(font2));
});
</script>
</body>
</html>