gecko/layout/style/test/test_media_queries_dynamic.html

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HTML

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=473400
-->
<head>
<title>Test for Bug 473400</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body onload="run()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=473400">Mozilla Bug 473400</a>
<iframe id="subdoc" src="about:blank"></iframe>
<div id="content" style="display: none">
</div>
<pre id="test">
<script class="testbody" type="application/javascript; version=1.7">
/** Test for Bug 473400 **/
SimpleTest.waitForExplicitFinish();
function run() {
var subdoc = document.getElementById("subdoc").contentDocument;
var subwin = document.getElementById("subdoc").contentWindow;
var style = subdoc.createElement("style");
style.setAttribute("type", "text/css");
subdoc.getElementsByTagName("head")[0].appendChild(style);
var sheet = style.sheet;
var iframe_style = document.getElementById("subdoc").style;
// Create a style rule and an element now based on the given media
// query "q", and return the computed style that should be passed to
// query_applies to see if that query currently applies.
var n = 0;
function make_query(q) {
var i = ++n;
sheet.insertRule("@media " + q + " { #e" + i + " { text-decoration: underline; } }", sheet.cssRules.length);
var e = subdoc.createElement("div");
e.id = "e" + i;
subdoc.body.appendChild(e);
var cs = subdoc.defaultView.getComputedStyle(e, "");
cs._originalQueryText = q;
return cs;
}
function query_applies(cs) {
return cs.getPropertyValue("text-decoration") == "underline";
}
function should_apply(cs) {
ok(query_applies(cs), cs._originalQueryText + " should apply");
}
function should_not_apply(cs) {
ok(!query_applies(cs), cs._originalQueryText + " should not apply");
}
var content_div = document.getElementById("content");
content_div.style.font = "-moz-initial";
var em_size =
getComputedStyle(content_div, "").fontSize.match(/^(\d+)px$/)[1];
let width_val = 317; // pick two not-too-round numbers
let height_val = 228;
iframe_style.width = width_val + "px";
iframe_style.height = height_val + "px";
var wh_queries = [
make_query("all and (min-width: " +
(Math.ceil(width_val/em_size) + 1) + "em)"),
make_query("all and (min-width: " +
(Math.floor(width_val/em_size) - 1) + "em)"),
make_query("all and (max-width: " +
(Math.ceil(width_val/em_size) + 1) + "em)"),
make_query("all and (max-width: " +
(Math.floor(width_val/em_size) - 1) + "em)"),
make_query("all and (min-width: " +
(Math.ceil(width_val/(em_size*2)) + 1) + "em)"),
make_query("all and (min-width: " +
(Math.floor(width_val/(em_size*2)) - 1) + "em)"),
make_query("all and (max-width: " +
(Math.ceil(width_val/(em_size*2)) + 1) + "em)"),
make_query("all and (max-width: " +
(Math.floor(width_val/(em_size*2)) - 1) + "em)")
];
is(wh_queries[0].fontSize, em_size + "px", "text zoom is 1.0");
should_not_apply(wh_queries[0]);
should_apply(wh_queries[1]);
should_apply(wh_queries[2]);
should_not_apply(wh_queries[3]);
SpecialPowers.setTextZoom(subwin, 2.0);
isnot(wh_queries[0].fontSize, em_size + "px", "text zoom is not 1.0");
should_not_apply(wh_queries[4]);
should_apply(wh_queries[5]);
should_apply(wh_queries[6]);
should_not_apply(wh_queries[7]);
SpecialPowers.setTextZoom(subwin, 1.0);
is(wh_queries[0].fontSize, em_size + "px", "text zoom is 1.0");
is(subwin.innerHeight, 228, "full zoom is 1.0");
should_not_apply(wh_queries[0]);
should_apply(wh_queries[1]);
should_apply(wh_queries[2]);
should_not_apply(wh_queries[3]);
SpecialPowers.setFullZoom(subwin, 2.0);
isnot(subwin.innerHeight, 228, "full zoom is not 1.0");
should_not_apply(wh_queries[4]);
should_apply(wh_queries[5]);
should_apply(wh_queries[6]);
should_not_apply(wh_queries[7]);
SpecialPowers.setFullZoom(subwin, 1.0);
is(subwin.innerHeight, 228, "full zoom is 1.0");
SimpleTest.finish();
}
</script>
</pre>
</body>
</html>