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hasUAVisualTransition landed in Firefox 149, making it available across all major engines. As well as having a very catchy name, it lets you avoid doubling up on page transitions. Here's how it works:

This is most welcome! What would be even more welcome would be the ability to disable UA transitions too, so that we can get other browsers to behave like Firefox does here.

I found a hack! bsky.app/profile/did:...