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

mjackson

/**
 * Registers the given callback to be called in the node.js callback
 * style, with error as the first argument, when the promise resolves.
 *
 * Also, returns a function that may be used to prevent the callback
 * from ever being called. Calling the returned function is synonymous
 * with saying "I no longer care about the resolution of this promise,
 * even if it fails."
 *
 * Since there is no provision in the promise spec for cancel/abort

getaaron

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