Using the supported attributes hook in WP 6.9 to make blocks bindable

[justintadlock]

WordPress introduced the block_bindings_supported_attributes_{$block_type} and block_bindings_supported_attributes hooks, which essentially let you make any block and one or more of its attributes bindable.

The hook doesn't take much to document. What the this tutorial needs is a solid use case. One that was just brought to my attention was the potential to make a featured video. That'd make a good tutorial that combined:

• The Video block
• Block Bindings
• Custom Fields (Post Meta)
• Custom Post Panel (for entering meta)
• Block Variations