https://openjdk.java.net/projects/openjfx/javafx-graphics/: OpenJFX JavaFX
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public interface com.sun.javafx.scene.GroupHelper$GroupAccessor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.sun.javafx.scene.GroupHelper$GroupAccessor
  super_class: java.lang.Object
{
  public abstract javafx.geometry.Bounds doComputeLayoutBounds(javafx.scene.Node);
    descriptor: (Ljavafx/scene/Node;)Ljavafx/geometry/Bounds;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      node  
}
SourceFile: "GroupHelper.java"
NestHost: com.sun.javafx.scene.GroupHelper
InnerClasses:
  public abstract GroupAccessor = com.sun.javafx.scene.GroupHelper$GroupAccessor of com.sun.javafx.scene.GroupHelper