fontfaceset-add-css-connected.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-font-loading/fontfaceset-add-css-connected.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<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-add">

<meta name="assert" content="Ensure that calling add() with a CSS-connected FontFace throws." />

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

@font-face {

    font-family: "WebFont";

    src: url("resources/Rochester.otf") format("opentype");

</style>

<script>

test(function(t) {

    let font = document.fonts.keys().next().value;

    let fontFaceSet = new FontFaceSet([]);

    assert_equals(fontFaceSet.size, 0);

    assert_throws_dom("InvalidModificationError", function() { fontFaceSet.add(font); });

    assert_equals(fontFaceSet.size, 0);

    let newFont = new FontFace("MyFont", "url('resources/Rochester.otf')");

    fontFaceSet.add(newFont);

    assert_equals(fontFaceSet.size, 1);

    fontFaceSet.add(newFont);

    assert_equals(fontFaceSet.size, 1);

});

</script>

</html>