Abstract: A web page may be rendered for display on a client device. The rendered web page may be based on a first document. It may be determined that (i) a scroll position of the rendered web page has changed such that the scroll position is below a threshold scroll position, and (ii) the change of the scroll position is due to an event other than receiving a scrolling command from a user. Possibly responsive to this determination, a second document may be requested and received from a content server device. The web page may be re-rendered for display on the client device. The re-rendered web page may include content from the first document and content from the second document.

Abstract: A web page may be rendered for display on a client device. The rendered web page may be based on a first document. A first scroll position of the rendered web page may be determined. The first scroll position may be below the beginning of the first document. The web page may be re-rendered for display on the client device. The re-rendered web page may be based on a second document. A web-page navigation back command may be received. Possibly responsive to receiving the web-page navigation back command, the web page may be further re-rendered for display on the client device, and a scroll position of the further re-rendered web page may be adjusted to be at the beginning of the first document. The further re-rendered web page may be based on the first document.

Abstract: A first document may be requested and received from a server device. Based on the first document, a web page may be rendered for display on a client device. The rendered web page may include a plurality of selectable items, each corresponding to a respective type of web page content. Via a user interface of the client device, a selection of a first selectable item of the selectable items may be received. Possibly responsive to receiving the selection of the first selectable item, a second document may be requested and received from the server device. The second document may include a first particular type of web page content corresponding to the first selectable item. The web page may be re-rendered for display on the client device to include content from both the first document and the second document.