title: xaringan: generated table with nested formatted code
body: <p>In xaringan how to create table having some cells being formatted as code.<br>
  In markdown I would declare such table in a following way:  </p>
  
  <pre><code>header1 | header2 | header3
  ---------------------------
  `fun1` | `code1` | text not formatted as code
  `fun2` | `code2` | another
  `fun3` | `code3` | and again
  </code></pre>
  
  <p>Of course I do not except syntax highlighting.</p>
  
  <p>I was able to use <code>knitr::kable(, format="html")</code> to produce table, but cannot make it work for formatting cells as code. Tried adding <code>&lt;pre&gt;&lt;code&gt;fun1&lt;/code&gt;&lt;/pre&gt;</code>, did not helped.</p>