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why is document.getElementById() not working in VS Code?

why is document.getElementById() not working in VS Code?? I keep getting this error: "Uncaught ReferenceError ReferenceError: document is not defined". I'm new to VS Code but I'm assuming the reason It's not working is that I need to install some extension to make it work. The same code is working on Replit but not VS code. I installed JS(ES6) Snippets, Open-in browser, Live Preview and Live Server. It's very simple 2-line code just to experiment but it's not working. It's driving me crazy!

let head = document.getElementById('change')
head.innerText = 'hello'
Via Active questions tagged javascript - Stack Overflow https://ift.tt/WKON2ns
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