flushToDOM(recursive) {
    var components = this.components;
    var child;
    var children = this.children;
    var i;
    var key;

    // Flush entity's components to DOM.
    for (key in components) {
      components[key].flushToDOM();
    }

    // Recurse.
    if (!recursive) {
      return;
    }
    for (i = 0; i < children.length; ++i) {
      child = children[i];
      if (!child.flushToDOM) {
        continue;
      }
      child.flushToDOM(recursive);
    }
  }
Reflect component data in the DOM (as seen from the browser DOM Inspector).

@param {boolean} recursive - Also flushToDOM on the children.