Function closestParent

closestParent(element, selector, includeSelf?): null | HTMLElement
A utility function that traverses up the DOM tree from a given HTML element, returning the closest ancestor that matches a specified CSS selector.

It is a replacement for the jQuery closest() method, providing similar functionality without the need for jQuery.
Parameters
- element: HTMLElement
  
  The starting HTML element from which to begin the search for the closest ancestor.
- selector: string
  
  A string containing a CSS selector. This string is used to match the ancestors of the element parameter.
- Optional includeSelf: boolean
  
  Optional parameter. If set to true, the function will consider the element parameter as a potential match.
Returns null | HTMLElement
The closest HTMLElement that matches the provided CSS selector. If no matching element is found, the function returns null.
Example
```
// Get an element by its GUID
const childElement = ix.api.dom.getHtml("<ELEMENT-GUID>");

// Get the closest "div" ancestor of the element with id "child"
const closestDiv = ix.api.dom.closestParent(childElement, "div#child");

// Get the closest "div" ancestor of the element with id "child", considering "child" as a potential match
const closestDiv = closestParent(childElement, "div#child", true);
```