Define what "hostile share" is

[saschanaz]

From mdn/content#8381 (comment):

https://w3c.github.io/web-share/#validate-share-data

If the user agent believes sharing any of the files in files would result in a potentially hostile share, return false.

But the spec does not say what can be a "potentially hostile share".

[saschanaz]

BTW, from what I see WebKit and Blink don't check such thing in canShare(). Should it be moved to share() instead?

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/modules/webshare/navigator_share.cc;l=77-104;drc=92b21970ffc4d2333c5081ccd1175d6c0ed9c6b0

https://webkit-search.igalia.com/webkit/rev/d9197df94519d81a87789468cb0a37d7f5c4048c/Source/WebCore/page/Navigator.cpp#128-145

[ewilligers]

Blink could be updated to match the spec, making canShare() more useful.