4.0.0 (2019-12-16)

contain: always set scale before using constrainXY (761a0ec), closes #426
css: fix border width retrieval in Firefox (5d2f580)
events: fallback to touch and mouse events (#399) (2c4c303)
events: fix triggering panzoomend for one pointer event (f23e0fa), closes #428
handledown: exclude descendents of excluded parents (b2f943a), closes #431
handleup: remove pointer regardless of isPanning state (8938b29), closes #402 #403
reset: use setTransform passed to reset options (2adbb4e)
setoptions: set cursor style with the option (9c8efb4)
setstyle: remove unnecessary param from exposed setStyle (c9bcf94)
zoom: account for smaller elements and padding/border (3fe89a1)
zoom: need the before and after dimensions to constrain (7c2c982), closes #426
zoom: set min and max scale based on containment (d05f1e7), closes #426

basic panning and zooming functionality (e80270f)
clean slate with typescript, rollup, and semantic-release (27a0887)
centering: switch to default transform origins (b483cda)
contain: add contain: 'outside' option (1571e99)
events: add custom events for panning and zooming (#398) (7713025)
exclude: add exclude option; change clickableClass to excludeClass (da72c32), closes #411
handlestartevent: add option to handle the start event (931743a), closes #414
overflow: add an option to override the parent's overflow (77032bb), closes #427
add a destroy method (#404) (c88ef75)
add animate option to transition the transforms (d9a8e67)
pan: add contain: 'inside' option (a7078e8)
pan: add panOnlyWhenZoomed option (5559967)
panzoom: add the force option (0ba521a), closes #413
zoom: implement focal point zooming without matrices (5d077f1)
zoom: pinch zooming with pointer events! (5ddbd30)

This is a complete rewrite of the panzoom library
to be a standard JS lib that doesn't rely on jQuery,
but can still integrate as a plugin

timmywil/panzoom 4.0.0 on GitHub