iframe needs to load src attributes, security policies, loading time and loading status. Detailed introduction: 1. The src attribute is one of the most important attributes in the iframe tag. It specifies the URL of the source web page to be loaded by the iframe. When the src attribute is set, the browser will start loading the web page corresponding to the URL, and in Display its content in an iframe; 2. Security policy. Since an iframe can load any web page content, the browser will impose some security restrictions on it to ensure user safety and so on.

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

As a programmer, I'm happy to answer questions about iframe loading.

First of all, iframe is a tag in HTML that is used to embed other web pages or documents in a web page. It allows developers to display the content of another web page in a web page, which can implement various functions, such as displaying maps, videos, advertisements, etc.

When an iframe element is created and added to a web page, it needs to load some content. This content can be from other pages on the same website or from different websites. The following are several aspects that need to be considered when loading an iframe:

src attribute: This is one of the most important attributes in the iframe tag. It specifies the URL of the source web page to be loaded by the iframe. When the src attribute is set, the browser will start loading the web page corresponding to the URL and display its content in an iframe.

Security policy: Since iframe can load any web page content, the browser will impose some security restrictions on it to ensure user safety. These restrictions include restrictions on cross-domain access, that is, iframes can only load content from the same domain name, unless corresponding configuration is made on the target website's server.

Loading time: Like other web page elements, iframe loading time is affected by the speed of your network connection and the size of the target page. If your landing page is very large or your connection is slow, it may take longer to load.

Loading status: When the iframe starts loading content, the browser will issue a request and wait for the server to respond. The iframe may display a blank page or load animation before loading is complete. Developers can obtain loading status notifications by listening to the iframe's load event and handle them accordingly.

To summarize, when using an iframe, the content it needs to load mainly includes the specified source web page, security policy restrictions, loading time and loading status. Developers should use iframes based on specific needs and scenarios, and ensure that the loaded content meets security requirements. In addition, some technical means can be used to optimize the loading speed of iframe, such as using appropriate caching strategies, asynchronous loading, etc.

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