Why does iframe have no web page?

The reasons include src attribute errors, same-origin policy restrictions, web page loading problems, content being blocked, etc. Detailed introduction: 1. src attribute error: Please ensure that the src attribute of the iframe points to the correct web page URL. Check whether the URL is spelled correctly and confirm whether the target webpage exists; 2. Same-origin policy restrictions: The browser's same-origin policy requires that the iframe can only load content with the same protocol, domain name, and port as the parent page. If the src of the iframe and the URL of the parent page do not comply with the same origin policy, the browser will prevent loading and so on.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

If an iframe does not display web page content, there may be several reasons:

1. Src attribute error: Please ensure that the src attribute of the iframe points to the correct web page URL. Check that the URL is spelled correctly and that the target page exists.

2. Same-origin policy restrictions: The browser's same-origin policy requires that iframes can only load content with the same protocol, domain name, and port as the parent page. If the src of the iframe and the URL of the parent page do not comply with the same-origin policy, the browser will prevent loading.

3. Web page loading problem: If there is a loading problem on the target web page, it may cause the iframe to be unable to display the content. You can try to access the target webpage directly in the browser to check whether it can load normally.

4. Content blocked: Sometimes, a web page may be blocked from loading in an iframe via the X-Frame-Options header or Content Security Policy (CSP) configuration. This is to prevent security issues such as clickjacking. If the target page has these security restrictions set, the browser will prevent the iframe from loading the content.

If none of the above solutions solve the problem, you may need to further check the browser console for error messages to determine the specific cause of the problem.

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