Yeah, it's a bit strange. The HTML Living Standard uses it to distinguish custom element names from standard names, sort of like a namespace. Without the hyphen it's easy for a linter to identify it as invalid syntax.
Jon
@musselwhite.dev
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Computer science PhD student at Howard University, homelab tinkerer, digital photographer, and Oxford comma adherent. Tongue is often firmly in cheek. 📷 joncaptureslight.com 👨💻 musselwhite.dev
