Created attachment 345621 [details] Invalid Constraint Error Providing 'exact' when specifying the deviceId causes an Invalid Constraint Error on Safari 12 in the Mojave Tech Preview. https://jsfiddle.net/cg1b93fm https://staging-connect.circleanywhere.com/public/misc/safari-device-exact.html Just providing { deviceId: ID } works.
<rdar://problem/42558459>
*** This bug has been marked as a duplicate of bug 187756 ***