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

tkrotoff

// https://gist.github.com/tkrotoff/b0b1d39da340f5fc6c5e2a79a8b6cec0

// WTF!
// parseFloat('-0') => -0 vs parseFloat(-0) => 0
// -0 === 0 => true vs Object.is(-0, 0) => false
const minus0Hack = (value: number) => (Object.is(value, -0) ? '-0' : value);

export const operators: {
  [operator: string]:
    | {