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## I'm submitting a...

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- [ ] Regression (a behavior that used to work and stopped working in a new release)
- [ ] Bug report <!-- Please search GitHub for a similar issue or PR before submitting -->
- [ ] Feature request
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## Current behavior

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## Expected behavior

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## Minimal reproduction of the problem with instructions

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## What is the motivation / use case for changing the behavior?

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## Environment

Viewer.js version: X.Y.Z
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Browser:

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- [ ] Chrome (Android) version XX
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- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Safari (iOS) version XX
- [ ] IE version XX
- [ ] Edge version XX

Others:
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