Function getStyles

src/modules/jquery.js:6375–6386

(elem)

  var rcustomProp = /^--/;

  var getStyles = function (elem) {
    // Support: IE <=11 only, Firefox <=30 (trac-15098, trac-14150)
    // IE throws on elements created in popups
    // FF meanwhile throws on frame elements through "defaultView.getComputedStyle"
    var view = elem.ownerDocument.defaultView;

    if (!view || !view.opener) {
      view = window;
    }

    return view.getComputedStyle(elem);
  };

  var swap = function (elem, options, callback) {
    var ret,