html скрыть элемент
document.getElementById('elementId').style.display = "none";
Skynet
document.getElementById('elementId').style.display = "none";display:none;function replaceContentInContainer(target, source) {
document.getElementById(target).innerHTML = document.getElementById(source).innerHTML;
}
function replaceContentInOtherContainer(replace_target, source) {
document.getElementById(replace_target).innerHTML = document.getElementById(source).innerHTML;
}<!DOCTYPE html>
<html>
<body>
<h2>What Can JavaScript Do?</h2>
<p id="demo">JavaScript can hide HTML elements.</p>
<button type="button" onclick="document.getElementById('demo').style.display='none'">Click Me!</button>
</body>
</html>