Sources: HyperCard 0 · Ancestors
Source. The user level wording and the script are Apple's own, from the HyperTalk Beginner's Guide (1989). Chrome measurements are taken from system.css and system7css (both MIT); the card size of 512 by 342 is corroborated by Decker. Type is ChiKareGo2 by Giles Booth (CC BY) with ChicagoFLF by Robin Casady as fallback. This is a recreation, not an emulator.