Use the

In web development, if you want to embed the content of another website into your own page, the <iframe></iframe> tag is a simple and straightforward way. It's like a window that opens another page in your page.

Basic usage

The most basic way to use <iframe></iframe> is to write this tag and specify the URL you want to embed through the src attribute:

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

This way the browser will display content from example.com on the current page. By default, the iframe will have a border. If you don't want the border, you can add style="max-width:90%" to remove it.

Common settings also include width and height, such as:

 <iframe src="https://example.com" width="600"    style="max-width:90%" style="border:none;"></iframe>

Controls the size and responsive layout of the iframe

iframes are fixed-size by default, but responsive layouts are more popular in modern web design. You can use CSS to automatically adapt to the screens of different devices.

A common method is to use percentages to set the width, or to combine the container for responsive processing:

 <div style="position:relative; padding-bottom:56.25%;">
  <iframe 
    src="https://example.com" 
    style="position:absolute; top:0; left:0; width:100%; height:100%; border:none;">
  </iframe>
</div>

This trick uses "padding percentage" to maintain aspect ratio (such as 16:9), which is suitable for embedding content such as videos or maps.

You can also use media queries to adjust the iframe size for different screens:

• Show larger sizes on the desktop
• Reduce width or adjust proportion on mobile

Safety and compatibility considerations

Although iframes are convenient, there are some things to pay attention to:

• Cross-domain restrictions : If you are embedded with content from other websites, you usually cannot manipulate its content through JavaScript.
• Loading performance : iframes will request additional resources, which may affect the page loading speed.
• SEO impact : Search engines do not pay special attention to the content in iframes, which is not conducive to SEO.
• Security Policy : Some websites have X-Frame-Options or Content-Security-Policy , which is prohibited from being embedded in iframes.

Therefore, it is best to confirm whether the target website is allowed to be nested before use. If the other party does not allow it, the iframe may appear blank or report an error.

Common uses examples

Some common iframe usage scenarios include:

• Embed maps (such as Google Maps)
• Insert third-party forms (such as Google forms, Typeform)
• Show ads or social media content (such as Twitter tweets, Facebook posts)
• Internal system integration (such as reports, dashboards)

For example, embed Google Maps:

 <iframe 
  src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3153.096837620503!2d-122.41941548468125!3d37.77492927975973!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x8085809c8a0d0d2b:0x3e82c4da0c5ddba0!2sSan Francisco, CA!5e0!3m2!1sen!2sus!4v1614820000000!5m2!1sen!2sus"
  width="100%" 
  height="450" 
  style="border:0;" 
  allowfullscreen="">
</iframe>

Basically that's it. iframe is a basic but practical HTML element. As long as you pay attention to how to use it, you can complete the content embedding task well.

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