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Fix: classList null safety

Hotfix

Fix issues arising from blocking `mouseleave` and `mouseout` events on all elements

Fix visibilityState and webkitVisibilityState not working as intended

Exclude anchor and span elements, add update URL

Prevent tracking when mouse leaves page

- Added webkitVisibilityState
- Added get() handler for visibilityState properties
- Add event listeners to document
- Add event.preventDefault()
- Hopefully added mobile support
- Remove repetitive code