website/static/playground.js/setOptions
function setOptions(options) {
  OPTIONS.forEach(function(option) {
    var elem = document.getElementById(option);
    if (elem.tagName === "SELECT") {
      elem.value = options[option];
    } else if (elem.type === "number") {
      elem.value = options[option];
    } else {
      var isInverted = elem.hasAttribute("data-inverted");
      elem.checked = isInverted ? !options[option] : options[option];
    }
  });
}