what's wrong with this code

Question

<span id="four">
</span > in HTML

document.getElementById('four').style.backgroundColor='grey'
in JS

Answer 1

This Lgtm, try posting the whole code for context

Answer 2

Hi, there's not much context, but maybe your js is executing before span element's rendering.
So you can try using window.onload like this:

window.onload = function() {
document.getElementById('four').style.backgroundColor='grey';
}

Then add something to your spam to see the change, like:

<span id="four"> Hello! </span>

Good luck!