Quelle test_emulateMedium.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/layout/base/tests/test_emulateMedium.html

<!DOCTYPE HTML>
<html>

<meta charset="utf-8">
<title>Test for Bug 819930</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css" />
<style>
  @media braille {
    body {
      background-color: rgb(255, 255, 0);
    }
  }

  @media embossed {
    body {
      background-color: rgb(210, 180, 140);
    }
  }

  @media handheld {
    body {
      background-color: rgb(0, 255, 0);
    }
  }

  @media print {
    body {
      background-color: rgb(0, 255, 255);
    }
  }

  @media projection {
    body {
      background-color: rgb(30, 144, 255);
    }
  }

  @media screen {
    body {
      background-color: green;
    }
  }

  @media speech {
    body {
      background-color: rgb(192, 192, 192);
    }
  }

  @media tty {
    body {
      background-color: rgb(255, 192, 203);
    }
  }

  @media tv {
    body {
      background-color: rgb(75, 0, 130);
    }
  }
</style>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=819930">Mozilla Bug 819930</a>
<p id="display"></p>

<div id="content" style="display: none"></div>

<script>
function waitForColorSchemeToBe(scheme) {
  return new Promise(resolve => {
    let mq = matchMedia(`(prefers-color-scheme: ${scheme})`);
    if (mq.matches) {
      resolve();
    } else {
      mq.addEventListener("change", resolve, { once: true });
    }
  });
}

add_setup(async function() {
  // Set a dark color scheme so that we can properly test the print override.
  await SpecialPowers.pushPrefEnv({ set: [["layout.css.prefers-color-scheme.content-override", 0]] });
  await waitForColorSchemeToBe("dark");
});

add_task(function() {
  let tests = [
    {name: 'braille', value: 'rgb(255, 255, 0)'},
    {name: 'embossed', value: 'rgb(210, 180, 140)'},
    {name: 'handheld', value: 'rgb(0, 255, 0)'},
    {name: 'print', value: 'rgb(0, 255, 255)'},
    {name: 'projection', value: 'rgb(30, 144, 255)'},
    {name: 'speech', value: 'rgb(192, 192, 192)'},
    {name: 'tty', value: 'rgb(255, 192, 203)'},
    {name: 'tv', value: 'rgb(75, 0, 130)'},
  ];

  let originalColor = 'rgb(0, 128, 0)';
  let body = document.body;

  let getColor = function() {
    return window.getComputedStyle(body).backgroundColor;
  };

  for (let test of tests) {
    // Emulate the given media
    SpecialPowers.emulateMedium(window, test.name);
    is(getColor(), test.value, 'emulating ' + test.name + ' produced ' +
        'correct rendering');

    ok(matchMedia(test.name).matches, "Media matches");
    if (test.value == "print") {
      ok(matchMedia("(prefers-color-scheme: light)").matches, "color-scheme is overridden when emulating print");
    }

    // Do the @media screen rules get applied after ending the emulation?
    SpecialPowers.stopEmulatingMedium(window);
    is(getColor(), originalColor, 'Ending ' + test.name +
        ' emulation restores style for original medium');
    ok(!matchMedia(test.name).matches, "Media no longer matches");
    ok(!matchMedia("(prefers-color-scheme: light)").matches, "color-scheme override should be restored");

    // CSS media types are case-insensitive; we should be too.
    SpecialPowers.emulateMedium(window, test.name.toUpperCase());
    is(getColor(), test.value,
        test.name + ' emulation is case-insensitive');
    SpecialPowers.stopEmulatingMedium(window);
  }

  is(getColor(), originalColor, 'No emulation');

  // Emulating screen should produce the same rendering as when there is
  // no emulation in effect
  SpecialPowers.emulateMedium(window, 'screen');
  is(getColor(), originalColor, 'Emulating screen produces original rendering');
  SpecialPowers.stopEmulatingMedium(window);

  is(getColor(), originalColor, 'No emulation, shouldn\'t change');

  // Screen should be case-insensitive too
  SpecialPowers.emulateMedium(window, 'SCREEN');
  is(getColor(), originalColor, 'screen emulation is case-insensitive');
  SpecialPowers.stopEmulatingMedium(window);

  is(getColor(), originalColor, 'No emulation, shouldn\'t change');

  // An invalid parameter shouldn't fail. Given the CSS rules above,
  // an invalid parameter should result in a different rendering from any
  // produced thus far
  SpecialPowers.emulateMedium(window, 'clay');
  let invalid = getColor();
  tests.push({name: 'screen', value: 'green'});
  tests.forEach(function(test) {
    isnot(invalid, test.value, 'Emulating invalid type differs from ' +
          test.name);
  });

  SpecialPowers.stopEmulatingMedium(window);

  is(getColor(), originalColor, 'No emulation, shouldn\'t change');
})
</script>

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