Userscript to add a "Dismiss All" button to the Blackboard Learn updates page

BlackboardDismissAll.user.js

// ==UserScript==
// @name         Blackboard Dismiss All Updates
// @namespace    https://github.com/G33kDude
// @version      0.1
// @description  Adds a "Dismiss All" button to the Blackboard Learn updates page
// @author       GeekDude
// @match        *://*.blackboard.com/webapps/streamViewer/streamViewer*
// @grant        none
// @update       https://gist.github.com/G33kDude/4ef48d78fde6cb07490a1c1de3ba79d0/raw/BlackboardDismissAll.user.js
// ==/UserScript==

var dismiss = document.createElement("a");
dismiss.href = "#";
dismiss.innerText = "Dismiss All";
dismiss.style.marginLeft = "1em";
dismiss.style.position = "absolute";
dismiss.style.top = "23px";
dismiss.style.right = "60px";
dismiss.style.zIndex = 13;
dismiss.onclick = function(e){
	e.preventDefault();

	if (!confirm("Are you sure you want to dismiss all notifications?"))
		return;

	var dis = document.querySelectorAll("a.browse[title=Dismiss]");

	for (var i = 0; i < dis.length; i++) {
		dis[i].click();
	}
};

var settings = document.getElementById("openSettings_alerts");
settings.parentNode.insertBefore(dismiss, settings);