Insert elements before JavaScript elements
Given the element #elem:
<ul id="parent">
<li>text</li>
<li>text</li>
<li id="elem">text</li>
<li>text</li>
<li>text</li>
</ul>
Insert an element before this element
with the text 'new'.
Modify the previous task so that clicking on the
inserted element causes '!' to be added
to the end of its text.
