1 files changed, 19 insertions, 0 deletions
diff --git a/content/assets/javascripts/closest-polyfill.js b/content/assets/javascripts/closest-polyfill.js
new file mode 100644
index 00000000..6a10a113
--- /dev/null
+++ b/content/assets/javascripts/closest-polyfill.js
@@ -0,0 +1,19 @@
+/*
+ * Polyfill for browsers that do not support 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 (el.matches(s)) return el;
+      el = el.parentElement || el.parentNode;
+    } while (el !== null && el.nodeType === 1);
+    return null;
+  };
+}