how to know iframe is loaded in js

how to know iframe is loaded in js

???

https://codepen.io/xgqfrms/full/oOEbvQ

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iframe & HTTPS & CORS

https://iframe.xgqfrms.xyz/eapp/index.html#blog.sina.cn

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how to know a url is loaded in iframe

window.location !== window.parent.location

https://www.geeksforgeeks.org/how-to-check-a-webpage-is-loaded-inside-an-iframe-or-into-the-browser-window-using-javascript/

https://tommcfarlin.com/check-if-a-page-is-in-an-iframe/

https://www.codeproject.com/Questions/213344/Find-current-url-loaded-into-iFrame-inside-html-pa

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