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

{
	"apiVersion": 2,
	"name": "core/audio",
	"category": "media",
	"attributes": {
		"src": {
			"type": "string",
			"source": "attribute",
			"selector": "audio",
			"attribute": "src"
		},
		"caption": {
			"type": "string",
			"source": "html",
			"selector": "figcaption"
		},
		"id": {
			"type": "number"
		},
		"autoplay": {
			"type": "boolean",
			"source": "attribute",
			"selector": "audio",
			"attribute": "autoplay"
		},
		"loop": {
			"type": "boolean",
			"source": "attribute",
			"selector": "audio",
			"attribute": "loop"
		},
		"preload": {
			"type": "string",
			"source": "attribute",
			"selector": "audio",
			"attribute": "preload"
		}
	},
	"supports": {
		"anchor": true,
		"align": true
	}
}