title: Validation warning: "Text run is not in Unicode Normalization Form C."
body: <p>I see a few other questions on here with the same title, but none of them explain how to fix this issue.</p>
  
  <p>Whenever I have special characters in my document through the use of HTML entities, the validator gives me the warning "Text run is not in Unicode Normalization Form C."</p>
  
  <p>Example:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;meta charset="UTF-8"&gt;
      &lt;title&gt;Test page&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  
  &amp;#8486;
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>You can try it out yourself, here: <a href="http://validator.w3.org/check" rel="nofollow">http://validator.w3.org/check</a></p>
  
  <p>Why am I getting the validation warning and what should I do to fix it?</p>