How to restrict loading of an image in iframe?

@larissa 

To restrict loading of an image in an iframe, you can use the sandbox attribute in the iframe tag along with the restrictions that you want to apply. Here is an example:

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

In this example, the sandbox attribute restricts the iframe from executing scripts and restricts it to the same origin as the parent page. You can add more restrictions as needed to prevent loading of the image. Some other restrictions that can be added include allow-forms, allow-popups, and allow-top-navigation.

Alternatively, you could also use Content Security Policy (CSP) headers on the server to restrict loading of specific images from external sources in iframes. By setting up a CSP policy with appropriate directives, you can prevent loading of images from unauthorized sources.