Jan Bösenberg waruyama

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


	// a * b + c
	// Math.fma - fused multiply–add (FMA) or fused multiply–accumulate (FMAC) in JavaScript
	// For implementation details, see "The Handbook of Applied Cryptography"
	// http://www.cacr.math.uwaterloo.ca/hac/about/chap14.pdf
	// and
	// https://github.com/JuliaLang/openlibm/blob/master/src/s_fma.c
	//!? BUGGY

	(function () {