This is a new feature from Chrome 71 or 72 which slipped through the cracks (but will be covered in What's New 74). "Capture Area Screenshot" lets you drag your mouse to screenshot an arbitrary rectangular area of the viewport. --- @kaycebasqueshttps://twitter.com/matijagrcic/status/1090916966196539392 …
Right, I should clarify that the only new thing here is the "Capture Area Screenshot" command. The feature has been buried within Inspect Mode since v62, as you mentioned. --- @kaycebasques