First...I don't mean pointer-lock (which works fine), but instead the 
setCapture() (old) or setPointerCapture() (new) functionality.

For example, if I drag a Dear ImGui window and the mouse pointer goes out 
of the browser window, mouse events are no longer reported. Releasing the 
mouse button outside the window means that the ImGui window now sticks to 
the mouse button when the mouse is moved back inside, because the 
application still thinks the mouse button is pressed.

In the olden times, there was a setCapture()/releaseCapture() event pair, 
which doesn't work in Chrome.

In modern times, there's a new setPointerCapture()/releasePointerCapture() 
event pair, but this requires a 'pointerId' parameter, which isn't part of 
the regular mouse events, but of the derived 'pointer events'.

Long story short, has anybody managed to hack this somehow with the 
emscripten_*() functions? I tinkered around with calling an EM_JS() 
function from within the mouse button event handlers, which then calls 
setPointerCapture/releasePointerCapture, but that isn't successful because 
those functions want an actual, active "pointerId" object, not just some 
random number :D

I guess that emscripten/html5.h needs a new set of event functions for 
pointer events 
(https://developer.mozilla.org/en-US/docs/Web/API/Pointer_events), instead 
of regular mouse events?

Thanks!
-Floh.

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