const container = document.querySelector('.container')
const child = document.querySelector('.child')
container.addEventListener('dragstart', event => {
console.log(event.target, event, '~~~~~~');
})
<div class="container" draggable="true">
<div class="child"></div>
</div>
div {
border: 1px solid green;
}
.container {
width: 100px;
height: 100px;
}
.child {
width: 50px;
height: 50px;
}