Iframe content URL disappear after 3 second - javascript

I'm trying to dynamically change the iframe URL, for doing so I'm calling to the window.onmessage = (event) => function and fire the URL as event.data variable, this happened from external button.
When I click on the external button the iframe is shown the right URL but after 3 seconds change to black (blank URL), why does it happen, and how to solve it?
**
The ifame code
**
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8">
<link rel="mask-icon" href="https://assets-cdn.github.com/pinned-octocat.svg" color="#000000">
<link rel="icon" type="image/x-icon" href="https://assets-cdn.github.com/favicon.ico">
<link rel="shortcut icon" type="image/x-icon" href="https://assets-cdn.github.com/favicon.ico">
<style>
body { background: #232323; width: 95%; margin: 0 auto; }
/* Responsive Container for iFrame */
.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; }
.embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
</style>
<title>Tech Ops PH | your < IT / design < partner </title>
<script type="text/javascript">
window.onmessage = (event) => {
if (event.data) {
document.getElementById("myIframe").src=event.data
}
}
</script>
</head>
<body>
<div class='embed-container embed-responsive embed-responsive-4by3'>
<iframe id="myIframe" width="600" height="9000" frameborder="0" style="border:0" allowfullscreen></iframe>
</div>
</body>
</html>

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I Made a button using html, css and js which occurs randomly on the page.But i want the button inside the body tag and it keeps getting out.
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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*{
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padding:0%;
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temp.addEventListener("click",change);
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<!DOCTYPE HTML>
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