first commit

wp-content/themes/twentytwentyone/assets/js/polyfills.js

@@ -0,0 +1,42 @@
+/**
+ * File polyfills.js.
+ *
+ * Polyfills for IE11.
+ */
+
+/**
+ * Polyfill for Element.closest() because we need to support IE11.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Element/closest
+ */
+if ( ! Element.prototype.matches ) {
+	Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
+}
+
+if ( ! Element.prototype.closest ) {
+	Element.prototype.closest = function( s ) {
+		var el = this;
+		do {
+			if ( Element.prototype.matches.call( el, s ) ) {
+				return el;
+			}
+			el = el.parentElement || el.parentNode;
+		} while ( el !== null && el.nodeType === 1 );
+		return null;
+	};
+}
+
+/**
+ * Polyfill for NodeList.foreach() because we need to support IE11.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach
+ */
+if ( window.NodeList && ! NodeList.prototype.forEach ) {
+	NodeList.prototype.forEach = function( callback, thisArg ) {
+		var i;
+		thisArg = thisArg || window;
+		for ( i = 0; i < this.length; i++ ) {
+			callback.call( thisArg, this[i], i, this );
+		}
+	};
+}