WordPress explicitly prioritizes preserving backward compatibility across versions and production public APIs.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 10: BUILDING-BLOCK REALITY Blocks Tend to Stick Around

"WordPress explicitly prioritizes preserving backward compatibility across versions and production public APIs."

The official WordPress developer handbook says WordPress has historically preserved backward compatibility and directs Gutenberg to preserve production public APIs wherever possible.

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Source title Backward Compatibility

Source authors WordPress.org

Source year 2026

Confidence high

Importance high