Current screen width indicator in EMs (useful for knowing when to add breakpoints when resizing browser window)

RWD Screen Width Indicator (em version)

<script>
$(window).resize(function() {
	var windowWidth = $(window).width();
	var bodyFontSize = $('body').css('font-size');
	var bodyFontSizeWithoutPx = parseInt(bodyFontSize);
	var emValue = windowWidth/bodyFontSizeWithoutPx;
	$('.screen-width').text(emValue + 'em');
});
</script>

<div id="debug" style="position:fixed;padding:0.3em 0.6em;background:#f1f1f1;font-size:0.6em;bottom:0;left:50%;">
	<span class="screen-width">0</span>
</div>