Tests that elements panel updates dom tree structure upon changes to characters.
Running: testDumpInitial
========= Original for normal mutation ========
<div id="node">Foo</div>
Running: testSetAttribute
===== Mutated text node =====
<div id="node">Bar</div>
Running: testModifyViaRange
========= Original for Range mutation ========
<div id="rangenode">Lorem ipsum dolor sit amet</div>
===== Contents modified via Range =====
- <div id="rangenode">
"Lorem ips"
<span>test</span>
"lor sit amet"
</div>