eference/components/amp-experiment). Multiple experiments can be run on the same AMP document in parallel with their own sets of variants. One AMP document can have at most one `amp-experiment` element.
  -->
  <amp-experiment>
    <script type="application/json">
      {
        "button-color-experiment": {
          "variants": {
            "0": 30,
            "1": 30,
            "2": 30
          }
        }
      }
    </script>
  </amp-experiment>

 <!-- ## Sample setup -->
<!--
  We use a button wh