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67 lines
2.0 KiB
HTML
67 lines
2.0 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test that pixel lengths don't change based on DPI</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<div id="display">
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<div id="pt" style="width:90pt; height:90pt; background:lime;">pt</div>
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<div id="pc" style="width:5pc; height:5pc; background:yellow;">pc</div>
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<div id="mm" style="width:25.4mm; height:25.4mm; background:orange;">mm</div>
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<div id="cm" style="width:2.54cm; height:2.54cm; background:purple;">cm</div>
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<div id="in" style="width:1in; height:1in; background:magenta;">in</div>
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<div id="mozmm" style="width:25.4mozmm; height:25.4mozmm; background:cyan;">mozmm</div>
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</div>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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var oldDPI = SpecialPowers.getIntPref("layout.css.dpi");
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var dpi = oldDPI;
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function check(id, val) {
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var e = document.getElementById(id);
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is(Math.round(e.getBoundingClientRect().width), Math.round(val),
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"Checking width in " + id + " at " + dpi + " DPI");
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is(Math.round(e.getBoundingClientRect().height), Math.round(val),
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"Checking height in " + id + " at " + dpi + " DPI");
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}
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function checkPixelRelativeUnits() {
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check("pt", 120);
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check("pc", 80);
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check("mm", 96);
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check("cm", 96);
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check("in", 96);
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}
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checkPixelRelativeUnits();
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SpecialPowers.setIntPref("layout.css.dpi", dpi = 96);
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var mozmm = document.getElementById("mozmm");
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var mozmmSize = mozmm.getBoundingClientRect().width;
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is(Math.round(mozmmSize), Math.round(mozmm.getBoundingClientRect().height),
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"mozmm div should be square");
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checkPixelRelativeUnits();
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SpecialPowers.setIntPref("layout.css.dpi", dpi = 192);
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// At 192 dpi, a one-inch box should be twice the number of device pixels,
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// and since we haven't changed the device-pixels-per-CSS-pixel ratio, the
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// mozmm box should be twice the size in CSS pixels.
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check("mozmm", mozmmSize*2);
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checkPixelRelativeUnits();
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SpecialPowers.setIntPref("layout.css.dpi", oldDPI);
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</script>
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</pre>
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</body>
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</html>
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