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                <div id="plot" style="width: 50%"></div>




                let data = {
  x: [0, 1, 2, 3, 4],
  y: [-1, 5, 2, 3, 3]

let layout = {
  xaxis: {
    range: [-1, 5]

let lockIcon = {
  'width': 1000,
  'height': 1000,
  'path': "M320 768h512v192q0 106 -75 181t-181 75t-181 -75t-75 -181v-192zM1152 672v-576q0 -40 -28 -68t-68 -28h-960q-40 0 -68 28t-28 68v576q0 40 28 68t68 28h32v192q0 184 132 316t316 132t316 -132t132 -316v-192h32q40 0 68 -28t28 -68z",
  'transform': 'matrix(0.75 0 0 -0.75 0 1000)'

let modeBarButtons = [[
    name: 'Custom Lock',
    icon: lockIcon,
    click: () => { alert('clicked custom button!'); }
    name: 'Snapshot',
    click: () => { alert('new button!'); }
  }, "zoom2d", "pan2d" ]];

Plotly.react('plot', [data], layout, { modeBarButtons: modeBarButtons });