<!doctype html>
<html>
  <h1>Send a message to a window using its label:</h1>
  <form id="send-message-form">
    <input id="send-message" placeholder="message" />
    <input id="send-label" placeholder="Secondary" />
    <button type="submit">Send</button>
  </form>

  <br />

  <h1>Create new window</h1>
  <form id="new-window-form">
    <input id="new-label" placeholder="newLabel" />
    <input id="new-title" placeholder="New window" />
    <button type="submit">Create</button>
  </form>

  <br />

  <h1