Further information:
You can read commentary on this example at the relevant part of the HTML data Attribute article.
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<html>
<body>
<h1>How to embed a webpage using the object element and data attribute</h1>
<object data="https://www.thewebmaster.com/"
type="text/html"
width="500"
height="200">
<p>The resource is not available or offline.</p>
</object>
</body>
</html>
You can read commentary on this example at the relevant part of the HTML data Attribute article.