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Bug 1346623 - Allow anonymous content created with nsIDocument::InsertAnonymousContent can change from non-native to native AC

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* Prevent canvas custom content from becoming NAC when reframing the root element
* Add an API to get computed style values through an AnonymousContent object

Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-16 20:19:06 -04:00 • committed by Roy Tam
commit fda213de85
6 changed files with 120 additions and 4 deletions
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60
layout/style/test/chrome/test_bug1346623.html Normal file
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<!DOCTYPE HTML>
<html>
<head>
<title>Test for bug 1346623</title>
<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
</head>
<body onload="startTest();">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1346623">Mozilla Bug 1346623</a>
<div id="display">
</div>
<pre id="test">
<script type="application/javascript">
var Ci = Components.interfaces;
var winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
function startTest() {
// load some styles at the agent level
var css = `
#ac-parent { color: green; }
#ac-child.abc { }
`;
var sheetURL = "data:text/css," + encodeURIComponent(css);
winUtils.loadSheetUsingURIString(sheetURL, winUtils.AGENT_SHEET);
// add canvas anonymous content
var bq = document.createElement("blockquote");
bq.id = "ac-parent";
bq.textContent = "This blockquote text should be green.";
var div = document.createElement("div");
div.id = "ac-child";
div.textContent = " This div text should be green.";
bq.appendChild(div);
var ac = document.insertAnonymousContent(bq);
document.body.offsetWidth;
is(ac.getComputedStylePropertyValue("ac-child", "color"), "rgb(0, 128, 0)",
"color before reframing");
// reframe the root
document.documentElement.style.display = "flex";
document.body.offsetWidth;
// restyle the div
ac.setAttributeForElement("ac-child", "class", "abc");
document.body.offsetWidth;
is(ac.getComputedStylePropertyValue("ac-child", "color"), "rgb(0, 128, 0)",
"color after reframing");
SimpleTest.finish();
}
SimpleTest.waitForExplicitFinish();
</script>
</pre>
</body>
</html>