File: test_sheet_privilege.html

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<!doctype html>
<title>Test whether it can access a filed in MediaList with normal privilege after accessing with chrome privilege.</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>

<style>
@media screen and (max-width: 800px) {
  body {
    background-color: lime;
  }
}
</style>
<script>
"use strict";

function assertMediaText(rule, description) {
  is(rule.media.mediaText, "screen and (max-width: 800px)", description);
}

add_task(function testCssRuleMedia() {
  assertMediaText(SpecialPowers.wrap(document).styleSheets[0].cssRules[0], "privileged document");
  assertMediaText(document.styleSheets[0].cssRules[0], "unprivileged document");
});

add_task(function testSheetFromCache() {
  for (let i = 0; i < 2; ++i) {
    const style = document.createElement("style");
    style.textContent = `@media screen and (max-width: 800px) {}`;
    document.head.append(style);
    assertMediaText(SpecialPowers.wrap(style).sheet.cssRules[0], "privileged sheet " + i);
    assertMediaText(style.sheet.cssRules[0], "unprivileged sheet " + i);
  }
});
</script>