textwidth

Get some text's offsetWidth without rendering it in the DOM

Usage

Define a style you want to compute:

var element = document.getElementById('foo');
 
textwidth.define('styleName', element);

Then, once defined, compute a string's width in that style like so:

textwidth.get('styleName', 'string whose width to compute');

Compatability

All browsers IE5 and up (in theory - untested in not-Webkit!)

How do I use this with package manager X?

Yes.