title: html textarea using specific character set
body: <p>I would like to "force" a specific character set (ISO-8859-1) for a specific textarea html tag in a page.</p>
  
  <p>I'm not sure if this is feasible either in HTML or using a JS technique, but to give an idea of what I would like to achieve:</p>
  
  <pre><code>&lt;textarea character-set="ISO-8859-1"&gt;&lt;/textarea&gt;
  </code></pre>
  
  <p>The above should allow the user to enter characters that are part only of the ISO-8859-1 character set, characters like € (EUR) should be blocked/displayed as dummy character.</p>
  
  <p>I'm asking this since my website is integrated with a third-party service that only supports ISO-8859-1 characters and I want the user entering the message immediately see that some characters are not permitted.</p>
  
  <p>Hope this make sense, thank you</p>