Selector unit

Pagelove's DOM-based server makes use of a selector unit in the HTTP Range header.

The HTTP Range request header indicates the part of the resource that the client is interested in. Whereas HTTP has historically only taken advantage of the bytes range unit, clients can indicate to the Pagelove server the part of the DOM they wish to modify using the selector range unit.

Range: selector=<CSS selector>

If a client requests a CSS selector that would match multiple elements in a document, only the first match is used. It is up to the client to ensure that the appropriate selector is used to reference the intended element.