trotzig/diffux

define(function() {
    return function( elem ) {
        // Support: IE<=11+, Firefox<=30+ (#15098, #14150)
        // IE throws on elements created in popups
        // FF meanwhile throws on frame elements through "defaultView.getComputedStyle"
        if ( elem.ownerDocument.defaultView.opener ) {
            return elem.ownerDocument.defaultView.getComputedStyle( elem, null );
        }

        return window.getComputedStyle( elem, null );
    };
});