Can not escaped the input value

Can not escaped the input value

I'm trying to a html escaped value into a input (submit).

  1. <div data-role="content" data-theme="a">
  2. <div role="main" class="ui-content">
  3.     <form action="" method="post">
  4.         <input type="submit" value="&lt;s&gt;aaa&lt;/s&gt;">
  5.     </form>
  6. </div>
  7. </div>

I think display a value: <s>aaa</s>
But displayed: aaa