nested-import-namespace-invalid.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/nested-import-namespace-invalid.html - WPT Dashboard Interop Dashboard

<!doctype html>

<title>@import and @namespace inside grouping rules should be dropped as invalid</title>

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

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

<link rel="help" href="https://drafts.csswg.org/css-syntax-3/#consume-an-at-rule">

<script>

"use strict";

function sheetRules(cssText) {

  const style = document.createElement("style");

  style.textContent = cssText;

  document.head.append(style);

  const rules = style.sheet.cssRules;

  const result = [];

  for (let i = 0; i < rules.length; i++) {

    result.push(rules[i]);

  style.remove();

  return result;

test(() => {

  const rules = sheetRules('@media all { @import url("data:text/css,"); }');

  assert_equals(rules.length, 1, "should have @media rule");

  assert_equals(rules[0].constructor.name, "CSSMediaRule");

  assert_equals(rules[0].cssRules.length, 0, "@import inside @media should be dropped");

}, "@import inside @media rule is dropped");

test(() => {

  const rules = sheetRules('@supports (color: red) { @import url("data:text/css,"); }');

  assert_equals(rules.length, 1, "should have @supports rule");

  assert_equals(rules[0].constructor.name, "CSSSupportsRule");

  assert_equals(rules[0].cssRules.length, 0, "@import inside @supports should be dropped");

}, "@import inside @supports rule is dropped");

test(() => {

  const rules = sheetRules('@media all { @namespace x url("urn:x"); }');

  assert_equals(rules.length, 1, "should have @media rule");

  assert_equals(rules[0].constructor.name, "CSSMediaRule");

  assert_equals(rules[0].cssRules.length, 0, "@namespace inside @media should be dropped");

}, "@namespace inside @media rule is dropped");

test(() => {

  const rules = sheetRules('@media all { @import url("data:text/css,"); p { color: red; } }');

  assert_equals(rules.length, 1, "should have @media rule");

  assert_equals(rules[0].cssRules.length, 1, "only the style rule should survive");

  assert_equals(rules[0].cssRules[0].selectorText, "p");

}, "@import inside @media is dropped but subsequent rules survive");

</script>