margin-003.html - mozsearch

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-page/cssom/margin-003.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">

<link rel="help" href="https://drafts.csswg.org/cssom/#the-csspagerule-interface">

<title>Add / remove margin rules inside an @page rule</title>

<style id="sheet">

  @page { }

</style>

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

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

<script>

  let sheet = document.getElementById("sheet").sheet;

  let pageRule = sheet.rules[0];

  test(() => {

    assert_equals(pageRule.cssRules.length, 0);

    pageRule.insertRule("@top-center {}");

    assert_equals(pageRule.cssRules.length, 1);

    assert_equals(pageRule.cssRules[0].name, "top-center");

    pageRule.insertRule("@top-right {}", 1);

    assert_equals(pageRule.cssRules.length, 2);

    assert_equals(pageRule.cssRules[0].name, "top-center");

    assert_equals(pageRule.cssRules[1].name, "top-right");

    pageRule.insertRule("@top-left {}", 0);

    assert_equals(pageRule.cssRules.length, 3);

    pageRule.insertRule("@top-left {}", 0);

    assert_equals(pageRule.cssRules.length, 4);

    // Invalid at-rule:

    try { pageRule.insertRule("@page {}"); } catch (e) {}

    // Another invalid at-rule:

    try { pageRule.insertRule("@media print {}"); } catch (e) {}

    // Style rules are not allowed here:

    try { pageRule.insertRule("div {}"); } catch (e) {}

    assert_equals(pageRule.cssRules.length, 4);

    assert_equals(pageRule.cssRules[0].name, "top-left");

    assert_equals(pageRule.cssRules[1].name, "top-left");

    assert_equals(pageRule.cssRules[2].name, "top-center");

    assert_equals(pageRule.cssRules[3].name, "top-right");

  }, "Insert rules");

  test(() => {

    assert_equals(pageRule.cssRules.length, 4);

    pageRule.deleteRule(3);

    assert_equals(pageRule.cssRules.length, 3);

    assert_equals(pageRule.cssRules[0].name, "top-left");

    assert_equals(pageRule.cssRules[1].name, "top-left");

    assert_equals(pageRule.cssRules[2].name, "top-center");

    pageRule.deleteRule(1);

    assert_equals(pageRule.cssRules.length, 2);

    assert_equals(pageRule.cssRules[0].name, "top-left");

    assert_equals(pageRule.cssRules[1].name, "top-center");

    pageRule.deleteRule(0);

    assert_equals(pageRule.cssRules.length, 1);

    pageRule.deleteRule(0);

    assert_equals(pageRule.cssRules.length, 0);

  }, "Delete rules");

</script>