javadoc offers a tab where one can view new APIs added per JDK release.

e.g. https://docs.oracle.com/en/java/javase/21/docs/api/new-list.html

By default, all releases are selected. If a user wants to view JDK 21 additions only, they need to deselect all other releases - 9 mouse clicks.

I think it's time for an "invert selection" and "select all" type button to be added to the page section. This topic was briefly mentioned during a short demo in the OpenJDK Committers' Workshop held in Brussels Feb 2024.