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iframe.contentWindow

A Pen By SkyRoxas

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CSS

            
              body{
 background:gray;
}

iframe{
  background:#fff;
}
!

JS

            
              const iframeWindow = document.getElementsByTagName('iframe')[0].contentWindow

iframeWindow.document.body.innerHTML = 'Hello World !!!!!!!!'
!
999px
Loading ..................

Console