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@HadaGunjyo

windowがあればwindow.parentがある。

Last updated at Posted at 2018-04-11

空のhtmlでもwindowがあればwindow.parentがある。

ブラウザ無を考慮するなら、windowの有無だけをチェックしてpostMessageすればよい。

<script>window.onmessage=function(ev){console.log('from child',ev)};</script>
<iframe srcdoc='<body onload="window.parent.postMessage(`xyz`,`*`)"></body>'></iframe>
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