Method postMessage

content_scripts/ui_component.js:157–159

(data)

  // Send a message to this UIComponent's iframe's page.
  // - data: an object with at least a `name` field.
  async postMessage(data) {
    (await this.iframePort).postMessage(data);
  }

  // Show the UIComponent.
  // - messageData: a message to send to the underlying iframe via `postMessage`.