Ville VilleKoo

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

	<html>
	<head>
	<title>jsonp test</title>
	<script src="http://code.jquery.com/jquery-1.6.2.min.js"></script>
	<script type="text/javascript">
	$(function(){
	$('#select_link').click(function(e){
	e.preventDefault();
	console.log('select_link clicked');