Mark Salsbery

@SebDelile I'll take a look at your code to see how you're using that stack, but in the meantime... Often, using MouseTracker can be easier for event handling on elements...

@geoff-harper @iangilman I'm looking into taking this - see [comment here](https://github.com/openseadragon/openseadragon/discussions/2224#discussioncomment-6599596)

@geoff-harper I'll take this on if you're cool with that. If so, can I just take over your branch or should I make a new one? cc @iangilman

> Sure @msalsbery, sorry I got caught up in other things and I'm currently away for a month or so. Let me know what you need Cool, thank you -...

@iangilman Here's some more info captured running on Edge Version 89.0.774.54 (Official build) (64-bit)  They all may be expected errors that we're testing the handling of...

@iangilman I looked at the fullscreen tests...could only find one, couldn’t find another one, but the one I found specifically noted in the code that it will always fail for...

@robhicks You'll probably find it pretty easy to work with percentage coordinates in OpenSeadragon. OpenSeadragon's viewport coordinates have one issue, however: y-axis coordinates/sizes are a factor of the image width...