HtmlModel API in JavaScript (ES5) Diagram API control

<div id='diagram'></div>

let nodes: NodeModel[] = [{
id: 'node1', width: 100, height: 100, offsetX: 300, offsetY: 100,
shape: { type: 'HTML',
content: '<div style='background:red;height:100%;width:100%;'><input type='button' value='{{:value}}' /></div>' }
}];
let diagram: Diagram = new Diagram({
...
nodes: nodes
...
});
diagram.appendTo('#diagram');