Screensharing: Bootstrapping Collaboration between Capturer and Capturee

Hello all,

An existing issue with screensharing is that the capturing app cannot
easily discover which application is being captured, even if the captured
application wishes to expose this information. Are you tab-sharing a
Wikipedia page or a presentation? If a presentation - what is its session
ID? The capturing application does not know. And what a shame that is! For
if the capturing application knew what it was capturing, it could establish
out-of-band communication with the captured application and request the
next slide, next article or anything, really, without forcing the user to
switch tabs back and forth.

*Capture Handle* is a feature that solves that problem. I've started Discourse
thread
<https://discourse.wicg.io/t/proposal-capture-handle-bootstrap-app-collaboration-when-screensharing/5354/>
on
the WICG. There's also an explainer
<https://docs.google.com/document/d/1oSDmBPYVlxFJxb7ZB_rV6yaAaYIBFDphbkx5bXLnzFg/edit?usp=sharing>
and
a spec-draft <https://eladalon1983.github.io/capture-handle/>.

This feature is available for *Origin Trial in Chrome beginning with m92*.

Please send me feedback in whichever way you find most convenient.

Thanks,
Elad Alon