<!DOCTYPE html>
<html>
 <head>
<meta charset="utf-8">
  <title>
   big tag
  </title>
  <style>
  .big { font-size: larger }
  </style>
 </head>
 <body>
  <p>Normal text, then some <big>&lt;big&gt; bigger text</big></p>
  <p>Similar text, using span <span class="big"> bigger text</span></p>
 </body>
</html>