JavaScript allows you to access the contents of an iframe

I was trying to load the content of a URL in an iframe and made sure that it didn't have x-frame-options set to SAMEORIGIN. However, I encountered the following error: Blocked a frame with origin "null" from accessing a cross-origin frame.

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<body>
<iframe id="TView"
        src="https://s.tradingview.com/mediumwidgetembed/?symbols=BTCusdt&amp;BTCusdt=BINANCE%3ABTCUSDT%7C12M&amp;topColor=%23EFE7FF&amp;lineColor=%23784ED1&amp;chartType=area&amp;locale=en&amp;fontColor=%23787B86&amp;gridLineColor=%23D3BDFF&amp;width=100%25&amp;height=100%25&amp;colorTheme=light&amp;&amp;utm_medium=widget_new&amp;utm_campaign=symbol-overview&amp;showFloatingTooltip=1&amp;showVolume=1"
        style="margin:0 !important; padding: 0 !important; width: 100%; height: 450px;" frameborder="0"
        allowtransparency="true" scrolling="no"></iframe>
</body>
<script>
    let iframe = document.getElementById('TView');
    setTimeout(()=>{
        let iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
        console.log(iframeDocument)
    },1000)
</script>

javascriptvue.jsiframenuxt.js

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