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+<!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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1203766">Mozilla Bug 1203766</a>
+<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>