Was just looking over the Safari 27 release notes¹, which is part of macOS 27, and noticed this:

Web Driver

New Features

- Allow your agent to connect to a Safari browser for development and debugging via the Safari MCP server. (176038457)

Related (From July 1st)

Introducing the Safari MCP server for web developers

https://webkit.org/blog/18136/introducing-the-safari-mcp-ser...

So that's interesting. On the other hand, looks like WebXR support for Safari will never come.

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¹ https://developer.apple.com/documentation/safari-release-not...