Chrome Version       : 62.0.3202.89
OS Version: OS X 10.12.6

What steps will reproduce the problem?
1. Open https://io-raf-bug.glitch.me/ and don’t move the mouse or trigger any other form of event. The text in the blue box does not update (or at least not consistently).
2. Move the mouse frantically to see the blue box update
3. Click the “With raF” link to schedule an empty rAF every frame
4. Repeat step 1 (no mouse movement) and see the blue box update consistently

What is the expected result?
Box should update without an empty rAF or mouse movements

Code: https://glitch.com/edit/#!/io-raf-bug?path=index.html:67:0


Please provide any additional information below. Attach a screenshot if
possible.

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