WordPress/wp-includes/blocks/image/block.json

{
	"name": "core/image",
	"category": "media",
	"attributes": {
		"align": {
			"type": "string"
		},
		"url": {
			"type": "string",
			"source": "attribute",
			"selector": "img",
			"attribute": "src"
		},
		"alt": {
			"type": "string",
			"source": "attribute",
			"selector": "img",
			"attribute": "alt",
			"default": ""
		},
		"caption": {
			"type": "string",
			"source": "html",
			"selector": "figcaption"
		},
		"title": {
			"type": "string",
			"source": "attribute",
			"selector": "img",
			"attribute": "title"
		},
		"href": {
			"type": "string",
			"source": "attribute",
			"selector": "figure > a",
			"attribute": "href"
		},
		"rel": {
			"type": "string",
			"source": "attribute",
			"selector": "figure > a",
			"attribute": "rel"
		},
		"linkClass": {
			"type": "string",
			"source": "attribute",
			"selector": "figure > a",
			"attribute": "class"
		},
		"id": {
			"type": "number"
		},
		"width": {
			"type": "number"
		},
		"height": {
			"type": "number"
		},
		"sizeSlug": {
			"type": "string"
		},
		"linkDestination": {
			"type": "string",
			"default": "none"
		},
		"linkTarget": {
			"type": "string",
			"source": "attribute",
			"selector": "figure > a",
			"attribute": "target"
		}
	},
	"supports": {
		"anchor": true,
		"lightBlockWrapper": true
	}
}