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chromium/third_party/blink/web_tests/external/wpt/css/css-page/cssom/margin-003.html 

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:[email protected]">
<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>