Why does a vertical scrollbar appears in the parent of the iframe?

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I would like to create an iframe inside an element. The iframe should fill the whole element.
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                <span>2020-12-22 08:05</span>
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<p>Do you mean the scrolling attribute? Replace your code with the below.</p>

<pre><code>&lt;div class="parent"&gt;
  &lt;iframe class="child" src="https://example.com" scrolling=no&gt;&lt;/iframe&gt;
&lt;/div&gt;
</code></pre>
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                <span>2020-12-22 08:25</span>
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<p>Make the iframe a block element. By default its computed value of display is inline so you will face a whitespace issue at the bottom which will create the overflow:</p>

<p></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-css lang-css prettyprint-override"><code>.parent {
  background: red;
  width: 200px;
  height: 200px;
  overflow:auto;
}

.child {
  display:block;
  width:100%;
  height:100%;
  border: 0;
  
  margin: 0;
  padding: 0;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="parent"&gt;
  &lt;iframe class="child" src="https://example.com"&gt;&lt;/iframe&gt;
&lt;/div&gt;</code></pre>
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