-set-table-cell">
  <template>
    <style>
    #histogram_container {
      display: flex;
      flex-direction: row;
    }

    #missing, #empty, #unmergeable, #scalar {
      flex-grow: 1;
    }

    #open_histogram, #close_histogram, #open_histogram svg, #close_histogram svg {
      height: 1em;
    }

    #open_histogram svg {
      margin-left: 4px;
      stroke-width: 0;
      stroke: blue;
      fill: blue;
    }
    :host(:hover) #open_histogram svg {
      background: blue;
      stroke: white;
   