Pedro Paulo Mota pedropmota

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

	var prefix = window.location.pathname.substr(0, window.location.pathname.toLowerCase().lastIndexOf("/extensions") + 1);
	var config = {
	host: window.location.hostname,
	prefix: prefix,
	port: window.location.port,
	isSecure: window.location.protocol === "https:"
	};
	require.config({
	baseUrl: (config.isSecure ? "https://" : "http://") + config.host + (config.port ? ":" + config.port : "") + config.prefix + "resources"
	});