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

{
	"$schema": "https://schemas.wp.org/trunk/block.json",
	"apiVersion": 3,
	"name": "core/heading",
	"title": "Heading",
	"category": "text",
	"description": "Introduce new sections and organize content to help visitors (and search engines) understand the structure of your content.",
	"keywords": [ "title", "subtitle" ],
	"textdomain": "default",
	"attributes": {
		"textAlign": {
			"type": "string"
		},
		"content": {
			"type": "rich-text",
			"source": "rich-text",
			"selector": "h1,h2,h3,h4,h5,h6",
			"__experimentalRole": "content"
		},
		"level": {
			"type": "number",
			"default": 2
		},
		"placeholder": {
			"type": "string"
		}
	},
	"supports": {
		"align": [ "wide", "full" ],
		"anchor": true,
		"className": true,
		"splitting": true,
		"color": {
			"gradients": true,
			"link": true,
			"__experimentalDefaultControls": {
				"background": true,
				"text": true
			}
		},
		"spacing": {
			"margin": true,
			"padding": true,
			"__experimentalDefaultControls": {
				"margin": false,
				"padding": false
			}
		},
		"typography": {
			"fontSize": true,
			"lineHeight": true,
			"__experimentalFontFamily": true,
			"__experimentalFontStyle": true,
			"__experimentalFontWeight": true,
			"__experimentalLetterSpacing": true,
			"__experimentalTextTransform": true,
			"__experimentalTextDecoration": true,
			"__experimentalWritingMode": true,
			"__experimentalDefaultControls": {
				"fontSize": true
			}
		},
		"__unstablePasteTextInline": true,
		"__experimentalSlashInserter": true,
		"interactivity": {
			"clientNavigation": true
		}
	},
	"editorStyle": "wp-block-heading-editor",
	"style": "wp-block-heading"
}