scrollTop in Text input

I have a problem that I don’t understand how I can read the scrollTop of the “Text input” object.

For example, to read the scrollTop of an html element (take this html):

<div id='coder' style='overflow-y:scroll;'>
	CODE
</div>

const coder = document.querySelector("#coder");

runtime.globalVars.CoderTop = coder.scrollTop;

const boxSTop = document.getElementById("TextBox");

runtime.globalVars.BoxTop = boxSTop.scrollTop;

First, you need to pick the instance of the TextBox. With the getElement() method, you can get its DOM element. At this point, you can access the scrollTop property.

const textInputInstance = runtime.objects.TextInput.getFirstInstance();
const textInputDOM = textInputInstance.getElement();

runtime.globalVars.BoxTop = textInputDOM.scrollTop;