Four hand-rolled external links (WelcomeDialog, DocumentationContent link renderer, NotFoundDialog, FirmwareDialog) could adopt @microbit/ui's new ExternalLink, which adds a visually hidden "opens in a new tab" to the accessible name.
HelpMenu's user-guide entry opens a new tab from a MenuItem — a different pattern ExternalLink doesn't cover; needs a library-level think.
Four hand-rolled external links (WelcomeDialog, DocumentationContent link renderer, NotFoundDialog, FirmwareDialog) could adopt @microbit/ui's new ExternalLink, which adds a visually hidden "opens in a new tab" to the accessible name.
HelpMenu's user-guide entry opens a new tab from a MenuItem — a different pattern ExternalLink doesn't cover; needs a library-level think.