From 693f9e4e28704577e93d3200bc4d8fdc80d32047 Mon Sep 17 00:00:00 2001
From: James Garbutt <43081j@users.noreply.github.com>
Date: Thu, 18 Oct 2018 22:53:06 +0100
Subject: [PATCH] Make toggleAttribute match with native signature (#5372)

---
 lib/legacy/legacy-element-mixin.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/legacy/legacy-element-mixin.js b/lib/legacy/legacy-element-mixin.js
index 151a13fa56..a6d00c1671 100644
--- a/lib/legacy/legacy-element-mixin.js
+++ b/lib/legacy/legacy-element-mixin.js
@@ -816,11 +816,13 @@ export const LegacyElementMixin = dedupingMixin((base) => {
      * @param {string} name HTML attribute name
      * @param {boolean=} bool Boolean to force the attribute on or off.
      *    When unspecified, the state of the attribute will be reversed.
-     * @param {Element=} node Node to target.  Defaults to `this`.
      * @return {boolean} true if the attribute now exists
      */
-    toggleAttribute(name, bool, node) {
-      node = /** @type {Element} */ (node || this);
+    toggleAttribute(name, bool) {
+      let node = /** @type {Element} */ this;
+      if (arguments.length === 3) {
+        node = /** @type {Element} */ arguments[2];
+      }
       if (arguments.length == 1) {
         bool = !node.hasAttribute(name);
       }