Render parses the X-Alpine-Target header and returns a html.Group containing only the requested parts, in the order they were specified as arguments to render.

RenderPage renders a full page if the X-Alpine-Target header is not present, otherwise, it uses Render to render the requested parts of the page.

The Part interface describes a part of a page with an ID that can be requested by an Alpine AJAX client.

PartMap is a map of parts by ID provided to a page function by RenderPage.