title: How to increase font size in XAML?
body: <p>how can I increase font of a, let's say, TextBlock? I <strong>don't</strong> want to have something like this:</p>
  
  <pre><code>&lt;TextBlock FontSize="20"&gt;
    text
  &lt;/TextBlock&gt;
  </code></pre>
  
  <p>because it won't work correctly when user changes Windows' settings of the controls' font size. Do we have something like <code>+VALUE</code> (eg. <code>+2</code>), similar to HTML?</p>
  
  <p><strong>EDIT</strong><br>
  That's what I meant talking about the Windows' settings:
  <img src="https://i.stack.imgur.com/pLApl.png" alt="enter image description here"></p>
  
  <p>but the answers I received totally satisfies me.</p>