text: export default {
    elements: [
      { // node a
        data: { id: 'a' }
      }, { // node b
        data: { id: 'b' }
      }, { // edge ab
        data: { id: 'ab', source: 'a', target: 'b' }
      },
      {
        data: { id: 'red1' },
        classes: 'red'
      },
      {
        data: {
          id: 12,
          source: 'b',
          target: 'red1'
        }
      }
    ],
    style: [
      {
        selector: 'node',
        style: {
          'background-color': '#666',
          'label': 'data(id)'
        }
      },
      {
        selector: '.red',
        style: {
          'background-image': 'https://farm8.staticflickr.com/7272/7633179468_3e19e45a0c_b.jpg'
        }
      }, {
        selector: 'edge',
        style: {
          'width': 3,
          'line-color': '#ccc',
          'target-arrow-color': '#ccc',
          'target-arrow-shape': 'triangle'
        }
      }
    ],
    layout: {
      name: 'grid',
      rows: 1
    },
    zoom: 1
  }
  