Block supports enable blocks to integrate with theme styling systems by providing standardized customization options. Rather than building custom controls, leverage WordPress’s pre-built panels for colors, typography, spacing, and alignment.
Core blocks like paragraphs use block supports for their sidebar controls – there’s no custom code for typography or color panels. The supports section in block.json declares which WordPress-provided controls should be available.
This system allows blocks to feel native across different themes while giving users familiar customization interfaces. Block supports bridge the gap between opinionated block design and flexible theme integration.