Blitz - WPT: insertRule-import-no-index.html

wpt / css / cssom / insertRule-import-no-index.html

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

Subtest	Status	Message
insertRule with import and omitted index argument	FAIL	cannot convert 'null' or 'undefined' to object
insertRule with import and undefined index argument	FAIL	cannot convert 'null' or 'undefined' to object

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/css/cssom/insertRule-import-no-index.html

<!DOCTYPE html>
<html>
<head>
    <title>CSS Test: CSSOM StyleSheet insertRule with import and omitted second argument</title>
    <link rel="author" title="Sendil Kumar N" href="mailto:sendilkumarn.opensource@gmail.com">
    <link rel="help" href="https://drafts.csswg.org/cssom/">
    <link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssrule-interface">
    <meta name="flags" content="dom">
    <script src="/resources/testharness.js" type="text/javascript"></script>
    <script src="/resources/testharnessreport.js" type="text/javascript"></script>
    <style id="styleElement">
        @import url("support/a-green.css");
    </style>
</head>
<body>
<div id="log"></div>
<script type="text/javascript">
    var sheet = document.getElementById("styleElement").sheet;
    test(function() {
        assert_equals(sheet.cssRules.length, 1);
        assert_throws_dom("HierarchyRequestError", function() { sheet.insertRule("p { color: green; }"); });
        assert_equals(sheet.cssRules.length, 1);
    }, "insertRule with import and omitted index argument");

    test(function() {
        assert_equals(sheet.cssRules.length, 1);
        assert_throws_dom("HierarchyRequestError", function() { sheet.insertRule("p { color: yellow; }", undefined); });
        assert_equals(sheet.cssRules.length, 1);
        assert_equals(sheet.cssRules.item(0).cssText, "@import url(\"support/a-green.css\");");
    }, "insertRule with import and undefined index argument");
</script>
</body>
</html>