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 first plurality of selectable items corresponding to respective types of web page content. It may be determined that a scroll position of the rendered web page has a particular characteristic. Possibly responsive to this determination, a second document, associated with one of the selectable items, may be requested and received from the server device. The web page may be re-rendered for display, and may include content from the first document and the second document. The re-rendered web page may include a second plurality of selectable items corresponding to respective types of web page content. The second plurality of selectable items may be different from the first plurality of selectable items.

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. The rendered web page may include a set of selectable items, each corresponding to a respective type of web page content. The set of selectable items may be defined in a user profile of a user associated with the client device. It may be determined that a scroll position of the rendered web page has a particular characteristic. Perhaps in response to determining that the scroll position of the rendered web page has the particular characteristic, one of the selectable items may be selected. A second document may be requested and received from the server device. The second document may be associated with the selected item. Based on the first document and the second document, the web page may be re-rendered for display.

Abstract: A web page may be rendered for display on a client device. The rendered web page may be based on a first document, and may include a plurality of selectable items corresponding to respective types of web page content. It may be determined that a first scroll position of the rendered web page has a first characteristic. Possibly responsive to this determination, a second document may be requested and received from a server device. The web page may be re-rendered for display on the client device, including content from the first document and the second document. It may be determined that a second scroll position of the re-rendered web page has a second characteristic. Possibly responsive to this determination, the web page may be further re-rendered for display on the client device, including content from the second document, but not the first 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. It may be determined that a first scroll position of the rendered web page is above a first threshold scroll position. Possibly responsive to determining that the first scroll position of the rendered web page is above the first threshold scroll position, a second document may be requested and received from a 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 second document followed by content from the first 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.

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 first plurality of selectable items corresponding to respective types of web page content. It may be determined that a scroll position of the rendered web page has a particular characteristic. Possibly responsive to this determination, a second document, associated with one of the selectable items, may be requested and received from the server device. The web page may be re-rendered for display, and may include content from the first document and the second document. The re-rendered web page may include a second plurality of selectable items corresponding to respective types of web page content. The second plurality of selectable items may be different from the first plurality of selectable items.

Abstract: A web page may be rendered for display on a client device. The rendered web page may include a first document and a first advertisement that is based on the first document. It may be determined that a first scroll position of the rendered web page has a first characteristic. Possibly responsive to determining that the first scroll position of the rendered web page has the first characteristic, a second document may be requested and received from a content server device, and, based on the second document, a second advertisement may be requested and received from an advertisement 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, content from the second document, the first advertisement, and the second advertisement.

Abstract: A web page may be rendered for display on a client device. The rendered web page may include a non-scrollable portion and a scrollable portion. The non-scrollable portion may contain a first advertisement in a particular position specified by an advertisement placeholder. The first advertisement and the scrollable portion may be based on a first document. A first scroll position of the scrollable portion may be determined to have a first characteristic. The web page may be re-rendered for display on the client device. The re-rendered web page may include the non-scrollable portion containing a second advertisement in the particular position, and the scrollable portion. The second advertisement may be different from the first advertisement. The second advertisement and the scrollable portion may be based on a second document.