Brock Whittaker 7eb41c5f7e Make lightbox canvas feature cross-browser compatible. ...

This makes the canvas zoom and pan feature cross-browser compatible in
a few ways:

1. Replace deprecated `mousewheel` event in favor of the similar and
cross-browser event `wheel`.

2. Create approximate substitute for `e.movementX` and `e.movementY`
values that are missing in Safari.

2017-07-31 17:03:31 -07:00

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