How to close the new html <dialog> tag by clicking on its ::backdrop

Issue

I didn't find any built in solution or workaround for closing the html5 element by clicking on its background(::backdrop), although it's clearly a basic functionality.

Solution

Backdrop clicks can be detected using the dialog bounding rect.

var dialog = document.getElementByTagName('dialog');
dialog.showModal();
dialog.addEventListener('click', function (event) {
    var rect = dialog.getBoundingClientRect();
    var isInDialog=(rect.top <= event.clientY && event.clientY <= rect.top + rect.height
      && rect.left <= event.clientX && event.clientX <= rect.left + rect.width);
    if (!isInDialog) {
        dialog.close();
    }
});

Answered By - Seralo