<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1176968 --> <head> <title>Test for Bug 1176968</title> <script type="text/javascript" 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), null).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>