> None of these classes can be extended by user code, and any attempt to do so 
> will fail at runtime with an exception. For this reason, we can seal the 
> class hierarchy and remove the run-time checks to turn this into a 
> compile-time error instead.
> 
> In some cases, `Node` and `Shape` are extended by JavaFX classes in other 
> modules, preventing those derived classes from being permitted subclasses. A 
> non-exported `AbstractNode` and `AbstractShape` class is provided just for 
> these scenarios. Note that introducing a new superclass is a source- and 
> binary-compatible change (see [JLS ch. 
> 13](https://docs.oracle.com/javase/specs/jls/se22/html/jls-13.html)).
> 
> I'm not sure if this change requires a CSR, as it doesn't change the 
> specification in any meaningful way. There can be no valid JavaFX program 
> that is affected by this change.

Michael Strauß has updated the pull request incrementally with one additional 
commit since the last revision:

  remove documentation

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1556/files
  - new: https://git.openjdk.org/jfx/pull/1556/files/c24aed5c..38b7a22e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1556&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1556&range=00-01

  Stats: 23 lines in 5 files changed: 0 ins; 23 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1556.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1556/head:pull/1556

PR: https://git.openjdk.org/jfx/pull/1556

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