Currently available in both Edge Dev and Canary builds and coming soon to production, is a new feature to be able easily share web links. See Quickly share links with yourself or others with the new share menu.
Note: If the share button doesn't show up on your toolbar, go to Settings - Appearance and scroll down to the "Select which buttons to show on the toolbar" section to turn it on.
Note: If the share button doesn't show up on your toolbar, go to Settings - Appearance and scroll down to the "Select which buttons to show on the toolbar" section to turn it on.