Which is the difference between srcdoc=“…” and src=“data:text/html,…” in an <iframe>?

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For example, which is the difference between these:
Some HTML</p>\">
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                <span>2020-12-04 16:41</span>
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<p>The main difference is that the 'src' attribute contains the address of the document you are going to embed in the  tag.</p>

<p>On the other hand 'srcdoc'attribute contains the HTML content of the page to show in the inline frame.</p>

<p><em>the main disadvantage of srcdoc is that it is not supported in all browsers whereas src is compatible with all the browsers.</em></p>

<p>for detailed explanation please go through the following link:
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe</p>
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                <span>2020-12-04 16:42</span>
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<p>The other answers list some superficial differences, but really miss the mark of the key difference that explains <em>why</em> browsers/spec writers would essentially duplicate something that already exists:</p>

<p><code>&lt;iframe src="data:...untrusted content" sandbox /&gt;</code> &lt;- Secure in modern browsers, <strong>insecure</strong> in legacy browsers with no sandbox support</p>

<p><code>&lt;iframe srcdoc="...untrusted content"   sandbox /&gt;</code> &lt;- Secure in modern browsers, <strong>secure</strong> (though non-functional) in legacy browsers</p>

<p>This new syntax provides content authors a way to protect their users, even when they may be using legacy browsers. Without it, content authors would be reluctant to use the sandbox feature at all, and it would not see use.</p>
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                <span>2020-12-04 16:43</span>
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<p>From MDN :</p>

<blockquote>
  <p><sup>1.</sup> The content of the page that the embedded context is to contain. This
  attribute is expected to be used together with the sandbox and
  seamless attributes. If a browser supports the srcdoc attribute, it
  will override the content specified in the src attribute (if present).
  If a browser does NOT support the srcdoc attribute, it will show the
  file specified in the src attribute instead (if present).</p>
</blockquote>

<p>So, the <code>srcdoc</code> attribute overrides the content embedded using <code>src</code> attribute.</p>

<p>Demo</p>

<hr>

<p>Also, what you are saying about the following snippet <code>data:text/html</code> is called Data URI and it has limitations..</p>

<blockquote>
  <p><sup>2.</sup> Data URIs cannot be larger than 32,768 characters.</p>
</blockquote>

<p><sup>
1. MDN, 2. MSDN
</sup></p>
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                <span>2020-12-04 16:48</span>
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<p>Another noticeable difference is that <code>src</code> attributes with data-uri support URI percent-encoding rules while <code>srcdoc</code> doesn't as it supports regular html syntax,</p>

<p>these sources will yield differently:</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-html lang-html prettyprint-override"><code>&lt;iframe srcdoc="&lt;p&gt;hello%20world&lt;/p&gt;&lt;h1&gt;give%0D%0Ame%0D%0Asome%24&lt;/h1&gt;"&gt;&lt;/iframe&gt;

&lt;iframe src="data:text/html;charset=UTF-8,&lt;p&gt;hello%20datauri&lt;p&gt;&lt;h1&gt;give%0D%0A me%0D%0Asome%24&lt;/h1&gt;"&gt;&lt;/iframe&gt;</code></pre>
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<p>I also noticed a difference in the parsing of js scripts inside the attributes value( it's probably more than just percentage-encoding ) but didn't figure the rule yet... </p>
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                <span>2020-12-04 16:54</span>
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<p>In your example the two forms are functionally identical. However, you can use both <code>src</code> and <code>srcdoc</code> attributes, allowing non-HTML5 browsers to use the <code>src</code> version, while HTML5 browsers can use the <code>srcdoc</code> version along with the <code>sandbox</code> and <code>seamless</code> attributes which offer more flexibility in how an iFrame is treated.</p>
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                <span>2020-12-04 16:57</span>
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<p>Iframe with <code>src</code> attribute with HTML Content is cross domain,</p>

<p>But iframe with <code>srcDoc</code> attribute with HTML Content is not cross domain</p>
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