Merge branch 'develop' into css-variables

# Conflicts:
#	src/js/captions.js
#	src/js/config/defaults.js
#	src/js/fullscreen.js
#	src/js/listeners.js
#	src/js/plyr.js

src/js/utils/elements.js

@@ -237,6 +237,26 @@ export function matches(element, selector) {
   return method.call(element, selector);
 }
 
+// Closest ancestor element matching selector (also tests element itself)
+export function closest(element, selector) {
+  const { prototype } = Element;
+
+  // https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
+  function closestElement() {
+    let el = this;
+
+    do {
+      if (matches.matches(el, selector)) return el;
+      el = el.parentElement || el.parentNode;
+    } while (el !== null && el.nodeType === 1);
+    return null;
+  }
+
+  const method = prototype.closest || closestElement;
+
+  return method.call(element, selector);
+}
+
 // Find all elements
 export function getElements(selector) {
   return this.elements.container.querySelectorAll(selector);