title: How does WPF decide which font to use for missing characters?
body: <p>I know that the default font for WPF is <code>Segoei UI</code>. This font for example doesn't have the glyphs for Chinese characters. So when user put a text like below, how does it detect which font it should use to render them correctly. Does it check for the range of each character and finds a font that has those characters, or is it internally using some font that contains most Unicode characters?</p>
  
  <p><a href="https://i.stack.imgur.com/mCNrj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mCNrj.png" alt="Example text containing characters of multiple cultures"></a></p>