paulirish

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

James1x0

function getGreetingTime (m) {
	var g = null; //return g
	
	if(!m || !m.isValid()) { return; } //if we can't find a valid or filled moment, we return.
	
	var split_afternoon = 12 //24hr time to split the afternoon
	var split_evening = 17 //24hr time to split the evening
	var currentHour = parseFloat(m.format("HH"));
	
	if(currentHour >= split_afternoon && currentHour <= split_evening) {