Slider not working on iPhone (IOS)

** PLEASE READ THIS BEFORE FILING AN ISSUE **

## Feature Requests / Breaking Changes in mdl-1.x

## Bugs

Please include the following information with your bug report:

> What MDL Version are you using? (please be specific, e.g. _major.minor.patch_)
**1.3.0**

> What browser(s) is this bug affecting (including version)?
**Safari, Chrome**

> What OS (and version) are you using?
**iOS 11**

> What are the steps to reproduce the bug? Can you create a plunker/codepen/jsfiddle which reproduces it?
**Just show the page at https://getmdl.io/components/#sliders-section**

> What is the expected behavior?
**The slider should move**

> What is the actual behavior?
**The slider doesn't move. When I touch the slider bar, the thumb does not move. It just stays at the center of the slider. Dragging does not work very well either.**

> Any other information you believe would be useful?
**It works on Android**