{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$id": "https://designsystemdocspec.org/v0.15.2/metadata/thumbnail.schema.json", "title": "Thumbnail metadata field", "description": "A single image thumbnail for compact display, defined as a URL plus required alt text.", "$defs": { "thumbnail": { "type": "object", "description": "A single image thumbnail for compact display, defined as a URL plus required alt text.", "required": [ "url", "alt" ], "properties": { "url": { "$ref": "../common/presentation.schema.json#/$defs/mediaUrl", "description": "URL or relative path to the thumbnail image." }, "alt": { "$ref": "../common/presentation.schema.json#/$defs/mediaAlt", "description": "Alt text for the thumbnail image. MUST NOT be empty." } }, "additionalProperties": false } } } URL or relative path to the thumbnail image. Alt text for the thumbnail image. MUST NOT be empty. References: mediaUrl, mediaAlt { "url": "https://design.acme.com/assets/thumbnails/button.png", "alt": "A primary button labeled 'Save changes'." }