MouseDown and MouseUp events for button in UI Toolkit?

Question

Unity

I’ll immediately note that the button was created not in Canvas, but through UI Builder.

I figured out the lesson how to catch a button click:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UIElements;

public class UIButtons : MonoBehaviour
{

    public Button delete;

    // Start is called before the first frame update
    void Start()
    {
        var root = GetComponent<UIDocument>().rootVisualElement;

        delete = root.Q<Button>("Delete");

        delete.clicked += Clicked;

    }

    // Update is called once per frame
    void Clicked()
    {
        Debug.Log("CLICKED");
    }
}

And how to catch the MouseDown and MouseUp events for the same button?