ResizeSensor.js optimization (#172)
ResizeSensor.js optimization (#172)

The aim of `getComputedStyle(element, 'position') == 'static'` is to detect that `element` is not "positioned".  
[`HTMLElement.offsetParent`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/offsetParent) returns the nearest positioned element in the containment hierarchy.  
`element.resizeSensor.offsetParent !== element` mean that  `element` is not positioned.
Right ?
marcj/css-element-queries,marcj/css-element-queries,marcj/css-element-queries,privard/css-element-queries