A page found in the browser's local storage shows with a yellow border.
# State
Yellow bordered pages come from the browser's local storage associated with the origin site. They are shown in preference to a page by the same name on the site.
Edits to a yellow page stay in local storage. These edits will only be visible to the author and only when viewing from the same computer using the same browser vendor (i.e. Safari, Chrome, etc.)
# Transition
The fork button will attempt to save a page as White Origin. If this succeeds, the browser local storage copy is removed.
HERE HERE --> White Origin
See Graphviz