code: function SettingsFlyout_animateSlideIn() {
                      var animateFromLeft = _shouldAnimateFromLeft();
                      var offset = animateFromLeft ? "-100px" : "100px";
                      _ElementListUtilities.query("div.win-content", this._element).
                          forEach(function (e) { Animations.enterPage(e, { left: offset }); });
  
                      var where,
                          width = this._element.offsetWidth;
                      // Slide in from right side or left side?
                      if (animateFromLeft) {
                          // RTL
                          where = { top: "0px", left: "-" + width + "px" };
                          this._element.style.right = "auto";
                          this._element.style.left = "0px";
                      } else {
                          // From right side
                          where = { top: "0px", left: width + "px" };
                          this._element.style.right = "0px";
                          this._element.style.left = "auto";
                      }
  
                      this._element.style.opacity = 1;
                      this._element.style.visibility = "visible";
  
                      return Animations.showPanel(this._element, where);
                  }
docs: SettingsFlyout animations