delete-namespace-rule-when-child-rule-exists.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/delete-namespace-rule-when-child-rule-exists.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Deleting a @namespace rule when list contains anything other than @import or @namespace rules should throw InvalidStateError.</title>

<link rel="help" href="https://drafts.csswg.org/cssom-1/#remove-a-css-rule">

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

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

<style>

  @namespace a url();

</style>

<script>

  test(function () {

    let styleSheet = document.styleSheets[0];

    styleSheet.cssRules[0];

    styleSheet.insertRule(`b {}`, 1);

    assert_throws_dom("InvalidStateError", () => styleSheet.deleteRule(0));

  }, "Deleting a @namespace rule when list contains anything other than @import or @namespace rules should throw InvalidStateError.");

</script>