We're exploring a solution that allows a block to declare a set of style attributes it supports, which are usually referred to as the style attributes of the block. The Block Editor uses this data to auto-generate InspectorControls for them, as well as enabling their use in experimental-theme.json.

A block would declare support for these style attributes via its block.json. See example from the paragraph block:

{
  "name": "core/paragraph",
  // ...
  "supports": {
    "__experimentalColor": true,
    "__experimentalLineHeight": true,
    "__experimentalFontSize": true,
  }
}

which means that the paragraph block has support for color, line-height, and font-size.

This master issue keeps track of this work.

Colors

Typography

Spacing