How to get coords of the text

Question

I know how to get node coordinates using HTMLElement.offsetParent. but how to get the text coordinates?

For example, the #t element coordinates:

getCoords(document.getElementById('t')) 

How to get the exact coordinates of the text elements question and another using JS?

<div style="padding: 30px 0 0 30px;">
  <textarea style="width: 400px;height: 300px; line-height: 180%;" id="t">
    Be specific and imagine you’re asking a question to another person. 
  </textarea>
</div>

let getCoords=function (node){
    var x = node.offsetLeft;
    var y = node.offsetTop;
    var parent = node.offsetParent;
    while (parent != null){
        x += parent.offsetLeft;
        y += parent.offsetTop;
        parent = parent.offsetParent;
    }
    return {x: x, y: y};
}