How do I get a variable to dislay hello world on the home page when a specific page on the same site is loaded?

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I am creating a website using google sites.The website consists of a main page and a couple of subpages.
I want the code to display 'hello world' on the main page when a specific subpage is loaded.
I have embedded the code bellow on the main page:

<!DOCTYPE html>
<html>
<body>

<h1>The iframe element + CSS</h1>

<p>An iframe with default borders:</p>
<iframe src="https://sites.google.com/view/restocknormal/home/qqq2" id="iframe">
</iframe>

<script>
  iframe.onload = function() {
   
    iframe.contentDocument.body.prepend("Hello, world!");
  };
</script>
</body>
</html>

google shows the error message google.sites.com refused to connect

Thank you in advance. Any tip or advice helps.

What I have tried:

I am just starting to learn javascript. I red about the iframe element on w3schools.com, and I ran this code on their site:

<!DOCTYPE html>
<html>
<body>

<h1>The iframe element + CSS</h1>

<p>An iframe with default borders:</p>
<iframe src="/default.asp" width="100%" height="300">
</iframe>

<p>An iframe with a thin black border:</p>
<iframe src="/default.asp" width="100%" height="300" style="border:1px solid black;">
</iframe>

<p>An iframe with no borders:</p>
<iframe src="/default.asp" width="100%" height="300" style="border:none;">
</iframe>

</body>
</html>

It ran without anyproblems

Posted 10-Feb-22 1:38am

sebastian m 2022

Updated 10-Feb-22 2:11am

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Richard Deeming · Accepted Answer · 2022-02-10T02:11:00

That Google Sites page has a content security policy[^] applied. Unless your page is hosted on either sites.google.com or google-admin.corp.google.com, it cannot include the page from Google Sites in an <iframe>.

Content-Security-Policy: base-uri 'self';object-src 'none';report-uri /_/view/cspreport;script-src 'nonce-kTJrTU3cDGn9YFmKcreUcQ' 'unsafe-inline' 'unsafe-eval';worker-src 'self';frame-ancestors https://google-admin.corp.google.com/

You're also going to hit the same-origin policy: unless your page is hosted on sites.google.com, it won't be able to access or manipulate the DOM of a page loaded from sites.google.com.

If you're in control of both pages, you may be able to use postMessage()[^] to overcome that restriction.