Michał Pałys-Dudek michaldudek

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

	// $.quickEach() replicates the functionality of $.each() but allows 'this'
	// to be used as a jQuery object without the need to wrap it using '$(this)'.
	// The performance boost comes from internally recycling a single jQuery
	// object instead of wrapping each iteration in a brand new one.

	// Development -----------------------------------
	(function($)
	{
	$.fn.quickEach = function(f)
	{