Change Content - Javascript

Change html element content using pure javascript author(s): Deepu Mohan Puthrote (WarFox)

HTML

<input type="button" value="Clear" id="clear"> 
<textarea id='output' rows=20 cols=90></textarea>

JavaScript

var input = document.querySelector('#clear');
var textarea = document.querySelector('#output');

input.addEventListener('click', function () {
    textarea.value = '';
}, false);