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child.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Child iFrame</title>
<style>
* {
font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
body {
background-color: rgb(224, 233, 255);
}
code {
font-family: monospace;
background-color: rgb(87, 87, 87);
color: white;
padding: 5px;
border-radius: 10px;
}
p {
color: rgb(54, 54, 54);
}
#parentReceivedMessage {
margin-top: 10px;
padding: 10px;
border: 1px solid rgb(54, 54, 54);
border-radius: 5px;
background-color: rgb(255, 255, 255);
}
</style>
</head>
<body>
<h1>Child HTML</h1>
<h3>This is the child HTML that is enclosed in the <code>index.html</code> (parent) iframe</h3>
<p>The message sent by <code>index.html</code>(parent) will be shown here</p>
<div id="parentReceivedMessage"> </div>
<script>
const messageDiv = document.getElementById("parentReceivedMessage");
window.addEventListener('message', (event) => {
messageDiv.textContent = event.data.message;
});
</script>
</body>
</html>