A first portion of content relating to a first markup document may be displayed to a user of the client system. Information relating to the first portion of content is stored at a server system. An action to display a current version of the first markup document on the client system is received. A current version of content for the first markup document is retrieved from the host server. The stored information relating to the first portion of content may be used to identify a third portion of content associated with the first markup document which has not previously been displayed to the user. The display of markup document content associated with the first markup document may then be modified in a manner which facilitates the user in identifying the third portion of content.