Skip to content

Instantly share code, notes, and snippets.


Mithi Sevilla mithi

View GitHub Profile
mithi /
Created Jul 25, 2020 — forked from paulirish/
What forces layout/reflow. The comprehensive list.

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
mithi /
Created Jul 25, 2020 — forked from stevekinney/
Web Performance Workshop

Web Performance