An HTML iframe is used to display a web page within another page by using the <iframe> tag, which specifies an inline frame for embedding external content. The height and width attributes determine the iframe size in pixels, and an iframe can be targeted by links using the target attribute referring to the iframe's name.

1. HTML iframe

2. <iframe>
 An HTML iframe is used to display a web page within a web page.
 The HTML <iframe> tag specifies an inline frame.
An inline frame is used to embed another document within the current HTML
document.
 Syntax:
<iframe src="url" title="description"></iframe>

3. Iframe Attributes - Height and Width
 Use the height and width attributes to specify the size of the iframe.
 The height and width are specified in pixels by default:
 Example
<iframe src="demo_iframe.htm" height="200" width="300" title="Iframe
Example"></iframe>

4. Iframe - Target for a Link
 An iframe can be used as the target frame for a link.
The target attribute of the link must refer to the name attribute of the iframe:
Example
<iframe src="demo_iframe.htm" name="iframe_a" title="Iframe
Example"></iframe>
<p><a href=“www.google.com"target="iframe_a">Google</a></p>