title: I only get second .innerHTML result, first one isn't running
body: <p>I couldn't get first .innerHTML. It shows 64 but not 125. Why?</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>    let result=document.querySelector('#reck');
      function getPow(x,y=2) {
          return Math.pow(x,y);
  }   
      result.innerHTML= getPow(5,3);
      result.innerHTML= getPow(8);</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;p id="reck"&gt;&lt;/p&gt;</code></pre>
  </div>
  </div>
  </p>
  <p>Thank you by now.</p>