2013-08-16 04:31:32 +04:00
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<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=886646
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-->
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<head>
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<meta charset="utf-8">
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<title>Test for Bug 886646</title>
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2019-04-16 06:50:44 +03:00
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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2013-08-16 04:31:32 +04:00
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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2016-03-21 09:06:42 +03:00
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<style type="text/css">
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#scroller {
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width: 100px;
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height: 100px;
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padding: 10px;
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border: 10px solid black;
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margin: 10px;
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overflow: hidden;
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}
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#container {
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width: 50px;
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height: 50px;
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}
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#sticky {
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position: sticky;
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width: 10px;
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height: 10px;
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overflow: hidden;
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}
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</style>
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2013-08-16 04:31:32 +04:00
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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=886646">Mozilla Bug 886646</a>
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<div id="display">
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2016-03-21 09:06:42 +03:00
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<div id="scroller">
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<div id="container">
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<div id="sticky"></div>
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</div>
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</div>
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2013-08-16 04:31:32 +04:00
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</div>
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<pre id="test">
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<script type="application/javascript">
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2016-03-21 09:06:42 +03:00
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/** Test for Bug 886646 - Offsets for sticky positioning, when accessed through
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* getComputedStyle(), should be accurately computed. In particular,
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* percentage offsets should be computed in terms of the scroll container's
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* content box. */
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2013-08-16 04:31:32 +04:00
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2016-03-21 09:06:42 +03:00
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// Test that percentage sticky offsets are computed in terms of the
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// scroll container's content box
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var offsets = {
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"top": 10,
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"left": 20,
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"bottom": 30,
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"right": 40,
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};
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2013-08-16 04:31:32 +04:00
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2016-03-21 09:06:42 +03:00
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var scroller = document.getElementById("scroller");
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var container = document.getElementById("container");
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var sticky = document.getElementById("sticky");
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var cs = getComputedStyle(sticky, "");
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2013-08-16 04:31:32 +04:00
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2016-03-21 09:06:42 +03:00
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for (var prop in offsets) {
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sticky.style[prop] = offsets[prop] + "%";
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is(cs[prop], offsets[prop] + "px");
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}
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// ... even in the presence of scrollbars
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scroller.style.overflow = "scroll";
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container.style.width = "100%";
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container.style.height = "100%";
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var ccs = getComputedStyle(container, "");
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function isApproximatelyEqual(a, b) {
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return Math.abs(a - b) < 0.001;
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}
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for (var prop in offsets) {
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sticky.style[prop] = offsets[prop] + "%";
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var basis = parseFloat(ccs[prop == "left" || prop == "right" ?
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"width" : "height"]) / 100;
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ok(isApproximatelyEqual(parseFloat(cs[prop]), offsets[prop] * basis));
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2013-08-16 04:31:32 +04:00
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}
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</script>
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</pre>
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</body>
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</html>
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