Answers for "js do something at bottom of div"

javascript scroll to bottom of div

//scroll to the bottom of "#myDiv"
var myDiv = document.getElementById("myDiv");
    myDiv.scrollTop = myDiv.scrollHeight;

css div at bottom of div

/* Position inside div at the bottom of containing (outside) div */

<style>
.outside {
	position: relative;
    width: 200px;
    height: 200px;
    background-color: #EEE; /*to make it visible*/
}
.inside {
    position: absolute;
    bottom: 2px;
}
</style>
<div class="outside">
    <div class="inside">inside</div>
</div>