Writing to a new tab

Hi all

I’m pretty new to this so this is going to sound very basic to most of you. Please excuse my ignorance.

I’ve created a new tab but can’t seem to be able to use this line to write some text to it. These are the relevant lines:

var OrderPage = window.open(“Order.html”,“_blank”);

OrderPage.document.getElementById(“test”).innerHTML = “Hello”;

where “test” is the id for a paragraph element in Order.html

The new tab (Order.html) opens ok but the text does not appear at all on it. Can someone please tell me what I’m doing wrong?

is the js file linked in Order.html? if it’s not linked it can’t affect it