WordPress/wp-includes/blocks/read-more/block.json

{
	"$schema": "https://schemas.wp.org/trunk/block.json",
	"apiVersion": 2,
	"name": "core/read-more",
	"title": "Read More",
	"category": "theme",
	"description": "Displays the link of a post, page, or any other content-type.",
	"textdomain": "default",
	"attributes": {
		"content": {
			"type": "string"
		},
		"linkTarget": {
			"type": "string",
			"default": "_self"
		}
	},
	"usesContext": [ "postId" ],
	"supports": {
		"anchor": true,
		"html": false,
		"color": {
			"gradients": true,
			"text": true
		},
		"typography": {
			"fontSize": true,
			"lineHeight": true,
			"__experimentalFontFamily": true,
			"__experimentalFontWeight": true,
			"__experimentalFontStyle": true,
			"__experimentalTextTransform": true,
			"__experimentalLetterSpacing": true,
			"__experimentalTextDecoration": true,
			"__experimentalDefaultControls": {
				"fontSize": true,
				"textDecoration": true
			}
		},
		"spacing": {
			"margin": [ "top", "bottom" ],
			"padding": true,
			"__experimentalDefaultControls": {
				"padding": true
			}
		},
		"__experimentalBorder": {
			"color": true,
			"radius": true,
			"width": true,
			"__experimentalDefaultControls": {
				"width": true
			}
		}
	},
	"style": "wp-block-read-more"
}