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test_webkit_device_pixel_ratio.html
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test_webkit_device_pixel_ratio.html
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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1176968
-->
<head>
<title>Test for Bug 1176968</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<style>.zoom-test { visibility: hidden; }</style>
<style><!-- placeholder for dynamic additions --></style>
</head>
<body onload="run()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1176968">Mozilla Bug 1176968</a>
<div id="content" style="display: none">
</div>
<script type="text/javascript">
</script>
<pre id="test">
<div id="zoom1" class="zoom-test"></div>
<div id="zoom2" class="zoom-test"></div>
<div id="zoom3" class="zoom-test"></div>
<script class="testbody" type="application/javascript">
/** Test for Bug 1176968 **/
SimpleTest.waitForExplicitFinish();
function run() {
function zoom(factor) {
var previous = SpecialPowers.getFullZoom(window);
SpecialPowers.setFullZoom(window, factor);
return previous;
}
function isVisible(divName) {
return window.getComputedStyle(document.getElementById(divName)).visibility == "visible";
}
function getScreenPixelsPerCSSPixel() {
return SpecialPowers.DOMWindowUtils.screenPixelsPerCSSPixel;
}
var screenPixelsPerCSSPixel = getScreenPixelsPerCSSPixel();
var baseRatio = 1.0 * screenPixelsPerCSSPixel;
var doubleRatio = 2.0 * screenPixelsPerCSSPixel;
var halfRatio = 0.5 * screenPixelsPerCSSPixel;
var styleElem = document.getElementsByTagName("style")[1];
styleElem.textContent =
["@media all and (-webkit-device-pixel-ratio: " + baseRatio + ") {",
"#zoom1 { visibility: visible; }",
"}",
"@media all and (-webkit-device-pixel-ratio: " + doubleRatio + ") {",
"#zoom2 { visibility: visible; }",
"}",
"@media all and (-webkit-device-pixel-ratio: " + halfRatio + ") {",
"#zoom3 { visibility: visible; }",
"}"
].join("\n");
ok(isVisible("zoom1"), "Base ratio rule should apply at base zoom level");
ok(!isVisible("zoom2") && !isVisible("zoom3"), "no other rules should apply");
var origZoom = zoom(2);
ok(isVisible("zoom2"), "Double ratio rule should apply at double zoom level");
ok(!isVisible("zoom1") && !isVisible("zoom3"), "no other rules should apply");
zoom(0.5);
ok(isVisible("zoom3"), "Half ratio rule should apply at half zoom level");
ok(!isVisible("zoom1") && !isVisible("zoom2"), "no other rules should apply");
zoom(origZoom);
SimpleTest.finish();
}
</script>
</pre>
</body>
</html>