Wide alignment support adds toolbar controls for normal, wide, and full-width block positioning. Enable by adding “align”: true to the supports section in block.json – WordPress handles all the interface and functionality automatically.
Alignment data is stored on individual block instances, not in custom attributes. The useBlockProps hooks automatically apply the necessary classes for theme CSS to provide appropriate styling.
Theme support is required for alignment controls to appear. If themes don’t declare alignment support, blocks won’t show these options regardless of their supports declaration.