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<!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>
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