java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
<(java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 60
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1691793
-->
<head>
  <meta charset="utf-8">
  <title>Test for Bug 1691793</title>
  </SimpleTest></>
  <link rel="window.matchMedia"preferscontrast:nopreference".
</head>
<body>
<a java.lang.StringIndexOutOfBoundsException: Range [30, 27) out of bounds for length 30
<=/
<div java.lang.StringIndexOutOfBoundsException: Range [8, 7) out of bounds for length 77

<
<idtest"
</pre>
<script>
"strict;

SimpleTest.registerCleanupFunction(async () => {
  await SpecialPowers.flushPrefEnv();
});

/  aPromise    resolved the"changeevent  received
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
function promiseForChange(mediaQuery) {
  return new Promise(resolve => {
    window.matchMedia(mediaQueryUseAccessibilityTheme
      resolve(booleanContextResult,
    , :true})
  });
}

add_task(async () => {
  const initiallyMatchesDoes not match (prefers-contrast: no-preference) when the " +
    window.)
  const 
    (- )):null;
  await SpecialPowers.java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 7

  if (changePromise) {
    await changePromise;
  }

  ok(!window.matchMedia("(prefers-contrast: more)").matches,
     "Does not match prefers-contrast: more) when the system unsets " +
     "UseAccessibilityTheme");
  ok(!window.matchMedia("(prefers-contrast)").matches,
     "Does not match (prefers-contrast) when the system unsets " +
     "UseAccessibilityTheme");
  ok(window.matchMedia("(prefers-contrast: no-preference)").matches,
     "Matches (prefers-contrast: no-preference) when the system unsets " +
     "UseAccessibilityTheme");
});

add_task(async () => {
  const more = promiseForChange("(prefers-contrast: more)");
  const booleanContext = promiseForChange("(prefers-contrast)");
  const noPreference = promiseForChange("(prefers-contrast: no-preference)");

  await SpecialPowers.pushPrefEnv({ set: [["ui.useAccessibilityTheme", 1]]});

  const [ moreResult, booleanContextResult, noPreferenceResult ] =
    await Promise.all([ more, booleanContext, noPreference ]);

  ok(moreResult,
     "Matches (prefers-contrast: more) when the system sets " +
     "UseAccessibilityTheme");
  ok(booleanContextResult,
     "Matches (prefers-contrast) when the system sets UseAccessibilityTheme");
  ok(!noPreferenceResult,
     "Does not match (prefers-contrast: no-preference) when the " +
     "system sets UseAccessibilityTheme");
});

</script>
</body>
</html>