<!-- height:100% implies the element is going to have the 100% height of its parent container.
height:auto means, the element will have flexible height i.e. its height will depend upon the height of children elements of it
Consider below example:
height:100% -->
<div style="height:50px">
<div id="innerDiv" style="height:100%;border:1px solid grey;">
hello
</div>
</div>
<!-- #innerDiv is going to have height:50px
height:auto -->
<div style="height:50px">
<div id="innerDiv" style="height:auto">
<div id="evenInner" style="height:10px;border:1px solid grey;">
hello1
</div>
</div>
</div>
<!-- now the #innerDiv is going to have height:10px -->
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