<!DOCTYPE html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=316447 --> <title>Test for Bug 316447</title> <script src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" href="/tests/SimpleTest/test.css"/> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=316447">Mozilla Bug 316447</a> <div contenteditable><br></div> <script> /** Test for Bug 316447 **/ getSelection().selectAllChildren(document.querySelector("div")); document.execCommand("inserthorizontalrule"); is(document.querySelector("div").innerHTML, "<hr>", "Wrong innerHTML"); </script>