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<!DOCTYPE html>
<title>Test for bug 1534399</title>
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
<script>
function start() {
  let sheet = InspectorUtils.getAllStyleSheets(document, false)[0];
  ok(sheet.href.indexOf("test.css") == -1, "Shouldn't have found the author sheet");

  is(sheet.disabled, false, "Sheet should initially be enabled");

  sheet.disabled = true;
  is(sheet.disabled, false, "Shouldn't be able to disable a UA sheet");

  SimpleTest.finish();
}

SimpleTest.waitForExplicitFinish();
document.addEventListener('DOMContentLoaded', start)
</script>