How to force close an opened download file (pdf) tab or page that opened by a link?

CloseAfterDownload.js

function openPage(url) {	
	window.setTimeout(function () {
		openWindow(url);
	} ,500);
}

function openWindow(url) {
	var tab = window.open(url);
	if (!url.location.pathname.includes('pdf')){
		setTimeout(function () {
			tab.close();
		}, 3000);
	}
}

I have written this short js code that makes the job. The script can be editable with how much time to delay the open and close of the page. Also i have added an ‘if’ condition that if the file opened is a pdf file, it will not close the tab.
instructions:

1. First include it to the html.
2. Add an onclick attr to the tag. inside, you put the “openPage()” function with the url (with single quotes surrounding it!);
3. In the href attribute put “javascript:void(0);”;