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Test Info:

<!DOCTYPE html>
<meta charset=utf-8>
<title>Test for bug 1203766</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
<style>
.x { color: red; }
body > .x { color: green; }
.y { color: green; }
body > .y { display: none; color: red; }
div > .z { color: red; }
.z { color: green; }
.a { color: red; }
body > .a { display: none; color: green; }
.b { display: none; }
.c { color: red; }
.b > .c { color: green; }
.e { color: red; }
.d > .e { color: green; }
.f { color: red; }
.g { color: green; }
.h > .i { color: red; }
.j > .i { color: green; }
</style>
<p id="display"></p>
<div class=y></div>
<div class=b></div>
<pre id="test">
<script class="testbody">
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
// Element that goes from being out of the document to in the document.
var e = document.createElement("div");
e.className = "x";
var cs = getComputedStyle(e);
is(cs.color, "");
document.body.appendChild(e);
is(cs.color, "rgb(0, 128, 0)");
// Element that goes from in the document (and display:none) to out of
// the document.
e = document.querySelector(".y");
cs = getComputedStyle(e);
is(cs.color, "rgb(255, 0, 0)");
e.remove();
is(cs.color, "");
// Element that is removed from an out-of-document tree.
e = document.createElement("div");
f = document.createElement("span");
f.className = "z";
e.appendChild(f);
cs = getComputedStyle(f);
is(cs.color, "");
f.remove();
is(cs.color, "");
// Element going from not in document to in document and display:none.
e = document.createElement("div");
e.className = "a";
cs = getComputedStyle(e);
is(cs.color, "");
document.body.appendChild(e);
is(cs.color, "rgb(0, 128, 0)");
// Element going from not in document to in document and child of
// display:none element.
e = document.createElement("div");
e.className = "c";
cs = getComputedStyle(e);
is(cs.color, "");
document.querySelector(".b").appendChild(e);
is(cs.color, "rgb(0, 128, 0)");
// Element that is added to an out-of-document tree.
e = document.createElement("div");
e.className = "d";
f = document.createElement("span");
f.className = "e";
cs = getComputedStyle(f);
is(cs.color, "");
e.appendChild(f);
is(cs.color, "");
// Element that is outside the document when an attribute is modified to
// cause a different rule to match.
e = document.createElement("div");
e.className = "f";
cs = getComputedStyle(e);
is(cs.color, "");
e.className = "g";
is(cs.color, "");
// Element that is outside the document when an ancestor is modified to
// cause a different rule to match.
e = document.createElement("div");
e.className = "h";
f = document.createElement("span");
f.className = "i";
e.appendChild(f);
cs = getComputedStyle(f);
is(cs.color, "");
e.className = "j";
is(cs.color, "");
SimpleTest.finish();
});
</script>
</pre>