Instead of provider-specific markup and script tags in the head, the
captcha.form() template macro now emits a placeholder element carrying
the CAPTCHA configuration in data attributes, on which a new entrypoint
mounts the React Captcha component. The widget still injects its hidden
response field inside the form, so the server-side verification flow is
unchanged.
This is the first use of inline React components to progressively
enhance server-rendered pages.
The field name is now more descriptive of what it actually is – the
configuration of the CAPTCHA provider – and aligns with the key used
when passing it to the client-side React form.
Quentin Gliech