The javadoc Standard Doclet has been moving away from the use of frames to navigate around the documentation to the use of javadoc Search.

In recent releases, we have been through a sequence of steps:
  1. Frames, no Search (up to JDK 8)
  2. Frames generated, but not displayed by default
  3. Frames not generated by default
In addition, we have taken steps to ensure that all navigation that could be done with frames can be done some other way, such as using Javadoc Search (assuming JavaScript is enabled) or via the index pages (when JavaScript is disabled.)

Now, the final step is to remove all support for frames in the generated documentation.

This will also mean removing the `--frames` option. The `--no-frames` option will be retained, but will effectively become a no-op.