diff --git a/js/core/Window.js b/js/core/Window.js
index d8c33bf..265903c 100644
--- a/js/core/Window.js
+++ b/js/core/Window.js
@@ -393,7 +393,7 @@ export class Window extends PsychObject {
 		// create a PIXI renderer and add it to the document:
 		this._renderer = PIXI.autoDetectRenderer(this._size[0], this._size[1], {
 			backgroundColor: this.color.int,
-			resolution: window.devicePixelRatio,
+			resolution: window.devicePixelRatio
 		});
 		this._renderer.view.style.transform = 'translatez(0)';
 		this._renderer.view.style.position = 'absolute';
diff --git a/js/visual/Slider.js b/js/visual/Slider.js
index 4def2f2..9ec05fe 100644
--- a/js/visual/Slider.js
+++ b/js/visual/Slider.js
@@ -557,13 +557,14 @@ export class Slider extends util.mix(VisualStim).with(ColorMixin)
 		this._marker.pointerdown = this._marker.mousedown = this._marker.touchstart = (event) => {
 			if (event.data.button === 0) {
 				self._markerDragging = true;
-
+/* not quite right, just yet (as of May 2020)
 				// set markerPos, but not rating:
 				const mouseLocalPos_px = event.data.getLocalPosition(self._pixi);
 				const rating = self._posToRating([mouseLocalPos_px.x, mouseLocalPos_px.y]);
 				self._markerPos = self._granularise(rating);
 
 				self._needMarkerUpdate = true;
+ */
 			}
 
 			event.stopPropagation();
@@ -609,8 +610,11 @@ export class Slider extends util.mix(VisualStim).with(ColorMixin)
 
 		// (*) slider mouse events outside of marker
 		// note: this only works thanks to eventCaptureRectangle
-		this._pixi.pointerdown = this._pixi.mousedown = this._pixi.touchstart = (event) => {
-			if (event.data.button === 0) {
+		/* not quite right just yet (as of May 2020)
+		this._pixi.pointerdown = this._pixi.mousedown = this._pixi.touchstart = (event) =>
+		{
+			if (event.data.button === 0)
+			{
 				self._markerDragging = true;
 
 				// set markerPos, but not rating:
@@ -625,6 +629,7 @@ export class Slider extends util.mix(VisualStim).with(ColorMixin)
 
 			event.stopPropagation();
 		};
+		*/
 
 		this._pixi.pointerup = this._pixi.mouseup = this._pixi.touchend = (event) => {
 			const mouseLocalPos_px = event.data.getLocalPosition(self._body);