<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>CSSOM - CSSGroupingRule - insertRule</title>
    <link rel="help" href="https://drafts.csswg.org/cssom/#the-cssgroupingrule-interface">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script>
    function create(t) {
        var style = document.createElement('style');
        style.appendChild(document.createTextNode('@media all { * {} }'));
        document.head.appendChild(style);
        t.add_cleanup(function() {
            document.head.removeChild(style);
        });

        assert_true(!!style.sheet, 'setup - sheet defined');
        assert_equals(
            style.sheet.cssRules.length, 1, 'setup - grouping rule created'
        );
        assert_equals(
            style.sheet.cssRules[0].cssRules.length, 1, 'setup - rule created'
        );
        return style.sheet.cssRules[0];
    }

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;
        var result;

        result = groupingRule.insertRule('.foo {}', 0);

        assert_equals(groupingRule.cssRules.length, 2);
        assert_not_equals(groupingRule.cssRules[0].cssText, first);
        assert_equals(groupingRule.cssRules[1].cssText, first);
        assert_equals(result, 0, 'result');
    }, 'index before first');

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;
        var result;

        result = groupingRule.insertRule('.foo {}', 1);

        assert_equals(groupingRule.cssRules.length, 2);
        assert_equals(groupingRule.cssRules[0].cssText, first);
        assert_not_equals(groupingRule.cssRules[1].cssText, first);
        assert_equals(result, 1);
    }, 'index after final');

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;
        var result;

        result = groupingRule.insertRule('.foo {}');

        assert_equals(groupingRule.cssRules.length, 2);
        assert_not_equals(groupingRule.cssRules[0].cssText, first);
        assert_equals(groupingRule.cssRules[1].cssText, first);
        assert_equals(result, 0);
    }, 'index not specified');

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;

        assert_throws_dom('IndexSizeError', function() {
            // The syntax error is intentional; it verifies that the insertion
            // index is validated prior to the CSS text.
            groupingRule.insertRule('???', 2);
        });

        assert_equals(groupingRule.cssRules.length, 1);
        assert_equals(groupingRule.cssRules[0].cssText, first);
    }, 'index exceeds length');

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;

        assert_throws_dom('SyntaxError', function() {
            groupingRule.insertRule('???', 0);
        });

        assert_equals(groupingRule.cssRules.length, 1);
        assert_equals(groupingRule.cssRules[0].cssText, first);
    }, 'CSS parsing error');

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;

        assert_throws_dom('HierarchyRequestError', function() {
            groupingRule.insertRule('@import url("foo.css");', 0);
        });

        assert_equals(groupingRule.cssRules.length, 1);
        assert_equals(groupingRule.cssRules[0].cssText, first);
    }, 'constraint violation');

    test(function (t) {
        var groupingRule = create(t);
        var first = groupingRule.cssRules[0].cssText;

        assert_throws_dom('HierarchyRequestError', function() {
            groupingRule.insertRule('@namespace url(http://www.w3.org/1999/xhtml);', 0);
        });

        assert_equals(groupingRule.cssRules.length, 1);
        assert_equals(groupingRule.cssRules[0].cssText, first);
    }, 'disallowed namespace rule');
    </script>
</head>
</html>