test_backdrop_filter_enabled_state.html

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<!DOCTYPE HTML>

<head>

  <meta charset=utf-8>

  <title>Test Backdrop-Filter Enabled State</title>

  <link rel="author" title="Erik Nordin" href="mailto:nordzilla@mozilla.com">

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

</head>

<script>

SimpleTest.waitForExplicitFinish();

(async function() {

  for (let enabled of [true, false]) {

    await SpecialPowers.pushPrefEnv({"set": [["layout.css.backdrop-filter.enabled", enabled]]});

    is(enabled, CSS.supports("backdrop-filter: initial"),

      "backdrop-filter is available only if backdrop-filter pref is set");

  SimpleTest.finish();

}());

</script>