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81 lines
2.4 KiB
HTML
81 lines
2.4 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=478321
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-->
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<head>
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<title>Test for CSS 'rem' unit</title>
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<script type="application/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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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=478321">Mozilla Bug 478321</a>
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<p id="display"></p>
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<p id="display2"></p>
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<div id="content" style="display: none">
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</div>
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<pre id="test">
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<script type="application/javascript">
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/** Test for CSS 'rem' unit **/
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function px_to_num(str)
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{
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return Number(String(str).match(/^([\d.]+)px$/)[1]);
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}
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function fs(elt)
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{
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return px_to_num(getComputedStyle(elt, "").fontSize);
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}
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var html = document.documentElement;
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var body = document.body;
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var p = document.getElementById("display");
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var p2 = document.getElementById("display2");
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html.style.font = "initial";
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var defaultFontSize = fs(html);
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// NOTE: This test assumes that the default font size is an
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// integral number of pixels (which is always the case at present).
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// If that ever becomes false, the calls to "is" may need to be replaced by
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// calls to "isapprox" that allows errors of up to some small fraction
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// of a pixel.
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html.style.fontSize = "3rem";
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is(fs(html), 3 * defaultFontSize,
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"3rem on root should triple root's font size");
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body.style.font = "initial";
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is(fs(body), defaultFontSize,
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"initial should produce initial font size");
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body.style.fontSize = "1em";
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is(fs(body), 3 * defaultFontSize, "1em should inherit from parent");
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body.style.fontSize = "200%";
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is(fs(body), 6 * defaultFontSize, "200% should double parent");
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body.style.fontSize = "2rem";
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is(fs(body), 6 * defaultFontSize, "2rem should double root");
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p.style.font = "inherit";
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is(fs(p), 6 * defaultFontSize, "inherit should inherit from parent");
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p2.style.fontSize = "2rem";
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is(fs(p2), 6 * defaultFontSize, "2rem should double root");
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body.style.font = "initial";
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is(fs(p), defaultFontSize, "inherit should inherit from parent");
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is(fs(p2), 6 * defaultFontSize, "2rem should double root");
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body.style.fontSize = "5em";
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html.style.fontSize = "200%";
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is(fs(p), 10 * defaultFontSize, "inherit should inherit from parent");
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is(fs(p2), 4 * defaultFontSize, "2rem should double root");
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// Make things readable again.
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html.style.fontSize = "1em";
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body.style.fontSize = "1em";
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</script>
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</pre>
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</body>
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</html>
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