Tests that user can mutate DOM by means of elements panel.
Original textContent
<a href="data:text/plain;,1234567890…23456789012345678901234567890" id="inspected">Anchor</a>
textContent when editing 'href'
<a href="data:text/plain;,12345678901234567890123456789012345678901234567890123456789012345678901234567890/123456789012345678901234567890123456789012345678901234567890" id="inspected">Anchor</a>
textContent after moving to 'id'
<a href="data:text/plain;,1234567890…23456789012345678901234567890" id="inspected">Anchor</a>
textContent after canceling the edit (equal to the original one)
<a href="data:text/plain;,1234567890…23456789012345678901234567890" id="inspected">Anchor</a>