import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

This commit is contained in:
Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
150858 changed files with 23884658 additions and 0 deletions

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<!DOCTYPE html>
<html>
<body>
<div style="position: absolute">
<iframe src="data:text/html,<body contenteditable>foo</body>"></iframe>
</div>
<script type="text/javascript">
onload = function() {
var iframe = document.querySelector("iframe");
var win = iframe.contentWindow;
var body = win.document.body;
iframe.focus();
body.focus();
var sel = win.getSelection();
sel.collapse(body.firstChild, 0);
};
</script>
</body>
</html>