[javascript] Show/hide 'div' using JavaScript

A simple example with a Button to scroll up. It will only scroll if the javascript is active, which is an event listening to the scroll type.

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document.getElementById('btn').style.display='none'

window.addEventListener('scroll', (event) => {
    console.log(scrollY)
    document.getElementById('btn').style.display='inline'
})
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a
long<br>
text<br>
comes<br>
long<br>
text<br>
again

<button id=btn class = 'btn btn-primary' onclick='window.scrollTo({top: 0, behavior: "smooth"});'>Scroll to Top</button>
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Live in action here

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