data-streamdown=
data-streamdown= is an HTML attribute-like token you may encounter in web markup, JavaScript frameworks, or templating systems. It’s not part of any official HTML specification, but it’s useful as a custom data attribute or directive name that signals how content should be handled in streaming, progressive enhancement, or client-side rendering flows.
What it typically means
- Stream direction: Suggests that a stream of data should be sent from the server toward the client (downstream).
- Progressive rendering hint: Marks elements whose content can be progressively replaced or streamed-in when available.
- Client-side hydration trigger: Indicates where client-side code should insert or hydrate streamed content.
- Feature flag for frameworks/plugins: Used by custom frameworks or
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