title: Round decimal point with HTML5 output
body: <p>I am building an html5 calculator that looks like</p>
  
  <pre><code>&lt;form onsubmit="return false" oninput="o.value = a.valueAsNumber + b.valueAsNumber"&lt;br&gt;
      &lt;input name="a" id="a" type="number" step="any"&gt; +&lt;br&gt;
      &lt;input name="b" id="b" type="number" step="any"&gt; =&lt;br&gt;
      &lt;output name="o" for="a b"&gt;&lt;/output&gt;&lt;br&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>And would like to round the results to 2 decimal points.</p>