Storage and process isolated web widgets

A content widget is created for an embedder that executes in a renderer process of a computer system. The content widget is configured to execute in a process that is separate from the renderer process and access a first data source that is isolated from the embedder. The content widget is configured to provide a representation of at least a portion of data from the first data source, and receive a selection of a first item corresponding to the representation. In response to receiving the selection, the content widget may retrieve the first item from the first data source, and in response to retrieving the first item, provide the first item to the embedder. The content widget may have one or more permissions that the embedder does not have, or the embedder may have one or more permissions that the content widget does not have.