WordPress/wp-includes/blocks/site-title/block.json

{
	"apiVersion": 2,
	"name": "core/site-title",
	"title": "Site Title",
	"category": "design",
	"description": "Displays the name of this site. Update the block, and the changes apply everywhere it’s used. This will also appear in the browser title bar and in search results.",
	"textdomain": "default",
	"attributes": {
		"level": {
			"type": "number",
			"default": 1
		},
		"textAlign": {
			"type": "string"
		},
		"isLink": {
			"type": "boolean",
			"default": true
		},
		"linkTarget": {
			"type": "string",
			"default": "_self"
		}
	},
	"example": {
		"viewportWidth": 500
	},
	"supports": {
		"align": [ "wide", "full" ],
		"html": false,
		"color": {
			"gradients": true,
			"link": true
		},
		"spacing": {
			"padding": true,
			"margin": true
		},
		"typography": {
			"fontSize": true,
			"lineHeight": true,
			"__experimentalFontFamily": true,
			"__experimentalTextTransform": true,
			"__experimentalFontStyle": true,
			"__experimentalFontWeight": true,
			"__experimentalLetterSpacing": true,
			"__experimentalDefaultControls": {
				"fontSize": true,
				"lineHeight": true,
				"fontAppearance": true,
				"letterSpacing": true,
				"textTransform": true
			}
		}
	},
	"editorStyle": "wp-block-site-title-editor"
}