If your element has an Id, you can just reference it from the window scope. The const page = is useless. Also The body has its own place under document: document.body replaces document.querySelector(‘body’)

If your element has an id, you can just reference it from the window scope

This is brittle, as defining a global variable with the same name (or the browser adding a API with the same name) will override it. This functionality was only kept for backwards compatibility with sites designed for Internet Explorer. The spec says to use getElementById instead.