title: Why do people put value="Submit" for button element in a form if it won't be posted
body: <p>I have seen people do:</p>
  
  <pre><code>&lt;form ..&gt;
  
    &lt;button type='submit' value='Submit'&gt;Sign Up&lt;/button&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>Why do they need <code>value='Submit'</code> if it isn't even submitted to the server? Is it for accessibility?</p>