How to use iframe margin to call a certain area of ​​other web pages_Experience exchange

While browsing the Internet, I found that I can use the margin function of an iframe to call part of a web page. It is so talented and will be convenient in the future

<meta http-equiv="pragma" content="no-cache"> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>New webpage</title> <style type="text/css"> body{ } </style> <div style="width:246px;height:280px;overflow:hidden;border:1px solid #000000;"> <div style="width:500px;height:800px;margin:-453px 0px 0px -10px;"> <iframe src=".com" width="100%" height="100%"></iframe> </div> <br><input onclick="runEx('runcode41769')" type="button" value="Run code"><input onclick="doCopy('runcode41769')" type="button" value="Copy code"><input onclick="doSave(runcode41769)" type="button" value="Save code">[Ctrl A Select all Note:<a href="/article/23421.htm" title="View specific details" target="_blank">If you need to introduce external Js, you need to refresh it to execute</a>]</div>