[jquery] Catch error if iframe src fails to load . Error :-"Refused to display 'http://www.google.co.in/' in a frame.."

I solved it with window.length. But with this solution you can take current error (X-Frame or 404).

iframe.onload = event => {
   const isLoaded = event.target.contentWindow.window.length // 0 or 1
}

MSDN

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