Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
increments / decrements on ArrowUp and ArrowDown inputs.
I copied the switch statement style I found in dom.js.
tests passing on
Chrome 73.0.3683.86 (Official Build) (64-bit)
Firefox 66.0.3 (64-bit)
Opera 60.0.3255.70
Safari 12.0.3 (14606.4.5)