When embedding an ArcGIS Online web map in a website, there are a number of configuration parameters that can be set (Use URL parameters to modify embedded maps—ArcGIS Online Help | ArcGIS ). I would like to see a new parameter added that allows one to specify a pre-existing bookmark from the map which will define the initial extent. I know there is already an "extent" parameter but it would be way more convenient in many cases to define extents in advance and access them via the bookmark name.