what is iframe

iframe is a tag in HTML. It is a technology that allows embedding another HTML document into the current document. It can embed other web pages, documents or media content in web pages. It is widely used, including web pages. Nesting, ad display, loading external content, safe isolation, etc.

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

Iframe (inline frame) is a tag in HTML that allows another HTML document to be embedded into the current document.

Iframe can be used to display other web pages, documents or media content in a web page. When we embed an Iframe in a web page, the browser will create a separate window in the current web page, which displays the embedded document or web page.

The syntax of Iframe is very simple. It is a self-closing tag, similar to a tag. The following is an example of a basic Iframe tag:

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

In the above example, the Iframe's src attribute specifies the URL of the document or web page to be embedded. When the browser parses this tag, it loads the content of the specified URL and displays it in the window.

Iframe has the following main features and application scenarios:

1. Web page nesting: The most common use of Iframe is to embed another web page in a web page. This is great for website design and development as it allows different web pages to be grouped together to form a cohesive web page.

2. Advertisement display: Many websites use Iframe to display advertisements. The advertiser places the advertising content in an Iframe and then embeds it into the target website's page. The benefit of this is that ad content can be updated and managed independently of the target site, while ad content can be loaded without impacting target site performance.

3. Load external content: Sometimes we need to load content from other websites into the web page, such as embedding a map, a video or a social media plug-in. This requirement can be easily achieved using Iframe, we only need to specify the corresponding URL.

4. Security isolation: In some special cases, we may need to load some untrusted content into the web page, but we do not want these content to affect the rest of the web page. Using Iframe, you can put these untrusted contents in a separate window to achieve safe isolation.

In short, Iframe is a powerful and flexible technology that allows us to embed other web pages, documents or media content in web pages. It has a wide range of applications, including web page nesting, ad display, loading external content and security isolation. As a programmer, it is very important to master the use of Iframe, because it can provide more possibilities for our web design and development.

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