How to replace a name for a JavaScript code? or a name for a php code.

Question

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Answer 1

To replace a name in Html using JavaScript:

Try following in CodePlayground
Html:
<div>Welcome <span id="name">John</span></div>

JavaScript:
var name=prompt ("Enter your name.");

window.onload = function() {
document.getElementById("name").innerText = name;
}

Answer 2

I have a website where there is a specific name in almost half of the website's pages but it's without id, but with a div so I wanted to change this specific name and put a JavaScript code instead or a Php File.