This is another Google-authored specification, implemented only by Google, which is not currently a web standard. It’s not just Safari that doesn’t support it;

This is another Google-authored specification, implemented only by Google, which is not currently a web standard. It’s not just Safari that doesn’t support it; Firefox doesn’t either. It’s a Blink-only API. > Editors: > Miguel Casas-Sanchez (Google LLC) > Reilly Grant (Google LLC) > Status of this document > This specification was published by the Web Platform Incubator Community Group. It is not a W3C Standard nor is it on the W3C Standards Track. — https://wicg.github.io/shape-detection-api/ https://wicg.github.io/shape-detection-api/