gecko-dev/image/test/reftest/colordepth.html

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<script>
/*
* Almost all of the image decoding reftests require the display to be in
* 24-bit color mode, or else the rendered images will have subtle color
* variations and will fail.
* The Windows test boxes used to have a tendency to flip to 16-bit color mode,
* so this test will explicitly check the color depth to make it more obvious
* when the requirement is not met. (See bug 414720.)
* 24-bit is only a minimum, allow higher values too. (See bug 458847.)
*/
var colorDepth = window.screen.colorDepth;
if (colorDepth < 24)
document.write("ERROR: color depth is only " + colorDepth + ".");
</script>