{
    "input": "[[iframe https://example.com]]",
    "tree": {
        "elements": [
            {
                "element": "iframe",
                "data": {
                    "url": "https://example.com",
                    "attributes": {}
                }
            },
            {
                "element": "footnote-block",
                "data": {
                    "title": null,
                    "hide": false
                }
            }
        ],
        "html-blocks": [
        ],
        "code-blocks": [
        ],
        "table-of-contents": [
        ],
        "footnotes": [
        ],
        "bibliographies": [
        ]
    },
    "errors": [
    ]
}