code: function iframeTag(args, content) {
    const url = args[0];
    const width = args[1] && args[1] !== 'default' ? args[1] : '100%';
    const height = args[2] && args[2] !== 'default' ? args[2] : '300';
  
    return `<iframe src="${url}" width="${width}" height="${height}" frameborder="0" allowfullscreen></iframe>`;
  }
docs: Iframe tag
  
  Syntax:
  {% iframe url [width] [height] %}