font-feature-settings-serialization-001.html

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: font-feature-settings serialization</title>
<link rel="author" title="Chris Nardi" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-fonts-3/#feature-tag-value">
<link rel="help" href="https://drafts.csswg.org/cssom/#common-serializing-idioms">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
    #test {
        font-feature-settings: "vert" 1;
    }
    #test1 {
        font-feature-settings: 'vert' 1;
    }
    #test2 {
        font-feature-settings: "vert" off;
    }
</style>
<div id="test"></div>
<div id="test1"></div>
<div id="test2"></div>
<script>
    const div = document.querySelector("#test");
    const div1 = document.querySelector("#test1");
    const div2 = document.querySelector("#test2");
    test(function() {
        assert_equals(getComputedStyle(div).fontFeatureSettings, '"vert"');
        assert_equals(getComputedStyle(div1).fontFeatureSettings, '"vert"');
    }, "font-feature-settings should be serialized with double quotes, and the default value of 1 should be omitted");
    test(function() {
        assert_equals(getComputedStyle(div2).fontFeatureSettings, '"vert" 0');
    }, "font-feature-settings should serialize 0 instead of off, given it's shorter");
</script>

chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/font-feature-settings-serialization-001.html