In https://github.com/phetsims/sun/issues/254, the touchArea defaults for HSlider thumb were changed so that they default to pixels, not a percentage of the thumb size. Sims that use HSlider's thumbSize option will therefore need to also specify thumbTouchAreaXDilation and thumbTouchAreaYDilation.
In https://github.com/phetsims/sun/issues/254, the touchArea defaults for HSlider thumb were changed so that they default to pixels, not a percentage of the thumb size. Sims that use HSlider's
thumbSizeoption will therefore need to also specifythumbTouchAreaXDilationandthumbTouchAreaYDilation.