UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36

Steps to reproduce the problem:
1. Have an <input type="range"> on the UI with an initial value
2. `input.setAttribute('value', someVal);`
3. `input.value = someVal`

What is the expected behavior?
The value is `someVal`, the range thumb has moved to the correct position.

What went wrong?
The value is `someVal`, but the range thumb is still in the initial position.

Did this work before? N/A 

Does this work in other browsers? No
 This works as expected in Firefox.
This behaves the same in Safari.

Chrome version: 67.0.3396.79  Channel: n/a
OS Version: OS X 10.13.4
Flash Version: 

Clicking on the thumb after doing the above steps makes it move to the right position.
The issue only happens the first time you call setAttribute / update the value. After that, it works as expected.
 

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