Created
June 12, 2012 01:40
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Window Size, Media Query
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<!doctype html> | |
<html> | |
<head> | |
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0"> | |
</head> | |
<body> | |
<pre id="out"></pre> | |
</body> | |
<script> | |
function checkSizes(){ | |
var out = [ | |
'window.devicePixelRatio: ' + window.devicePixelRatio, | |
'window.innerWidth: ' + window.innerWidth, | |
'window.innerHeight: ' + window.innerHeight, | |
'window.screen.width: ' + window.screen.width, | |
'window.screen.height: ' + window.screen.height, | |
'', | |
]; | |
var tests = { | |
'-webkit-device-pixel-ratio' : window.devicePixelRatio, | |
'-moz-device-pixel-ratio' : window.devicePixelRatio, | |
'device-pixel-ratio' : window.devicePixelRatio, | |
'device-aspect-ratio' : window.screen.width + '/' + window.screen.height, | |
'aspect-ratio' : window.innerWidth + '/' + window.innerHeight, | |
'width' : window.innerWidth + 'px', | |
'device-width' : window.screen.width + 'px', | |
'height' : window.innerHeight + 'px', | |
'device-height' : window.screen.height + 'px', | |
} | |
for(var prop in tests){ | |
var test = prop + ': ' + tests[prop]; | |
if(window.matchMedia('(' + test + ')').matches) | |
out.push(test); | |
} | |
document.getElementById('out').textContent = out.join('\n'); | |
} | |
checkSizes(); | |
window.addEventListener('resize', checkSizes, true); | |
</script> | |
</html> |
resolutionのクエリ(dip)は、どこでもマッチしなかった。viewportにtarget-densitydpi=device-dpiを指定するとエラーになる。
Retinaの新iPadも昔のiPadはdevice-widthとdevice-heightが同じ。本当のデバイスピクセル数は、この値にデバイスピクセル比を乗算したものになる。
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デバイスピクセル比が2のデバイスで、viewportのスケールを0.5にし、ピクセル比を1に調整しても、window.devicePixelRatioの値は変わらない。現在の値ではなく、本来の持っている能力の値のよう。