The <iframe> tag in HTML is used to embed another HTML document within the current document. It creates an inline frame that can display a separate web page or content from a different source. The embedded content is treated as a separate browsing context, allowing for the inclusion of external resources or applications.

Syntax:

<iframe src="https://www.example.com" width="600" height="400" frameborder="0">
  <!-- Fallback content if the iframe is not supported -->
</iframe>

Key Attributes:

1. src:

   • Specifies the URL of the document to embed in the iframe.

   <iframe src="https://www.example.com"></iframe>
   

2. width and height:

   • Define the dimensions of the iframe in pixels.

   <iframe src="https://www.example.com" width="800" height="600"></iframe>
   

3. frameborder:

   • Specifies whether or not to display a border around the iframe. It is deprecated in HTML5 and should be replaced with CSS for styling.

   <iframe src="https://www.example.com" frameborder="0"></iframe>
   

4. allow:

   • Provides permissions for certain features such as microphone, camera, fullscreen, and more. It enhances security and privacy by specifying what the embedded content is allowed to do.

   <iframe src="https://www.example.com" allow="fullscreen; microphone"></iframe>
   

5. sandbox:

   • Enables a set of restrictions on the iframe's content, such as disabling scripts or forms. It can take a list of values to apply specific restrictions.

   <iframe src="https://www.example.com" sandbox="allow-scripts"></iframe>
   

6. title:

   • Provides a title for the iframe content, which can be useful for accessibility purposes.

   <iframe src="https://www.example.com" title="Example Site"></iframe>
   

Example Usage:

Basic Example:

<iframe src="https://www.example.com" width="600" height="400"></iframe>

In this example, the iframe embeds the content from "https://www.example.com" with a width of 600 pixels and a height of 400 pixels.

Example with Attributes:

<iframe src="https://www.example.com" width="800" height="600" frameborder="0" allow="fullscreen" title="Example Site"></iframe>

In this example:

• The iframe displays content from "https://www.example.com".
• It has no border (frameborder="0").
• It allows fullscreen mode.
• The title attribute provides a description for accessibility.

Accessibility and Security Considerations:

• Accessibility: Providing a meaningful title attribute helps users who rely on screen readers understand the purpose of the iframe. Ensure that the content inside the iframe is accessible and usable.

• Security: Using the sandbox attribute helps restrict what the iframe content can do, enhancing security. For example, sandbox="allow-scripts" allows scripts but prevents other actions such as form submissions or navigation. Be cautious with the allow attribute to ensure that only the necessary permissions are granted.