Currently, the polyfill does its job without testing whether the browser supports background-size or not, depending on the site author to include it only for IE<9. It would be good if it can deactivate itself if the browser does support background-size. (In reality this would only be IE9, but a feature test would be best.)
Currently, the polyfill does its job without testing whether the browser supports background-size or not, depending on the site author to include it only for IE<9. It would be good if it can deactivate itself if the browser does support background-size. (In reality this would only be IE9, but a feature test would be best.)