Adding a 'copy' button to <pre> content

copy-pre.css

.pre-wrapper{
	position:relative;
}
.pre-wrapper pre{
	padding-top: 25px;
}
.pre-wrapper .copy-snippet {
	border-radius: 0;
	min-width:55px;
	background: none repeat scroll 0 0 transparent;
	border: 1px solid #bbb;
	color: #26589F;
	font-family: 'HELEVETICA',sans-serif;
	font-size: 12px;
	font-weight: normal;
	line-height: 1.42rem;
	margin: 0;
	padding: 0px 5px;
	text-align: center;
	text-decoration: none;
	text-indent: 0;
	position:absolute;
	background:#ccc;
	top:0;
	left:0;
}
.pre-wrapper .copy-snippet:disabled{
	color:#555;
}

copy-pre.js

jQuery( document).ready(function($){
	var copyid = 0;
	$('pre').each(function(){
		copyid++;
		$(this).attr( 'data-copyid', copyid).wrap( '<div class="pre-wrapper"/>');
		$(this).parent().css( 'margin', $(this).css( 'margin') );
		$('<button class="copy-snippet">Copy</button>').insertAfter( $(this) ).data( 'copytarget',copyid );
	});

	$('body').on( 'click', '.copy-snippet', function(ev){
		ev.preventDefault();

		var $copyButton = $(this);

		$pre = $(document).find('pre[data-copyid=' + $copyButton.data('copytarget' ) + ']');
		if ( $pre.length ) {
			var textArea = document.createElement("textarea");

			// Place in top-left corner of screen regardless of scroll position.
			textArea.style.position = 'fixed';
			textArea.style.top = 0;
			textArea.style.left = 0;

			// Ensure it has a small width and height. Setting to 1px / 1em
			// doesn't work as this gives a negative w/h on some browsers.
			textArea.style.width = '2em';
			textArea.style.height = '2em';
			
			// We don't need padding, reducing the size if it does flash render.
			textArea.style.padding = 0;

			// Clean up any borders.
			textArea.style.border = 'none';
			textArea.style.outline = 'none';
			textArea.style.boxShadow = 'none';

			// Avoid flash of white box if rendered for any reason.
			textArea.style.background = 'transparent';

			//Set value to text to be copied
			textArea.value = $pre.html();

			document.body.appendChild(textArea);
			textArea.select();

			try {
				document.execCommand('copy');
				$copyButton.text( 'Copied').prop('disabled', true);;
			} catch (err) {
				$copyButton.text( 'FAILED: Could not copy').prop('disabled', true);;
			}
			setTimeout(function(){
				$copyButton.text( 'Copy').prop('disabled', false);;
			}, 3000);
		}
	});
});