Test Case Boilerplate

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HTML

Top<br><br>
<button class="down">Scroll Down</button>
<div style="height:2000px; background:#ccc;">Space</div>
Bottom<br><br>
<button class="up">Scroll To Top</button>
<div style="height:100px;">Space</div>

JavaScript

$('button.down').click(function () {
    $('html, body').scrollTop($('body').height());
});

$('button.up').click(function () {
    $('html, body').scrollTop(0);
});