allowedcharacters4html.html

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<!DOCTYPE html>

<html lang="en">

  <head>

    <meta charset="utf-8">

    <title>Example</title>

    <script type="application/its+xml">

     <its:rules  xmlns:its="http://www.w3.org/2005/11/its"  xmlns:h="http://www.w3.org/1999/xhtml" version="2.0">

      <its:param name="acParam">name</its:param>

      <its:allowedCharactersRule allowedCharacters="[a-zA-Z_\-]" selector="//h:code[@id=$acParam]"/>

     </its:rules>

    </script>

  </head>

  <body>

    <p>Login names can only use letters from A to Z (upper or lowercase)

    and the character underscore (_) and minus (-).

    For example: <code id="name">Huck_Finn</code>.</p>

  </body>

</html>