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

javiersantos

/*
* Get the current URL of the selected Chrome tab. Call to getCurrent
* By Javier Santos
* https://gist.github.com/javiersantos/c3e9ae2adba72e898f99
*/

var currentURL;

chrome.tabs.query({'active': true, 'windowId': chrome.windows.WINDOW_ID_CURRENT}, 
function(tabs){