It can be implemented by using the iframe element, which will create a nested browsing window.
<h1>iFrame practice</h1>
<iframe src="01-html-practice-3.html" width="600" height="300">Read the <a href="01-html-practice-3.html">html page</a>.</iframe>If the browser do not support iframe elements, the content between the <iframe> and </iframe> tags will be displayed.
The iframe element can present security concerns due to the fact that scripts can be executed thought them. This is why we should use the sandbox attribute to prevent this from happening: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe