From ed2a46b22e9c2a03392127bb9a85f67b88d790cc Mon Sep 17 00:00:00 2001
From: mrmr1993
Date: Mon, 7 Sep 2015 00:53:36 +0100
Subject: Traverse shadow DOMs when looking for scrollable elements

---
 lib/dom_utils.coffee | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'lib')

diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index ad88deae..ee7d415f 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -370,5 +370,11 @@ DomUtils =
           text
       texts.join " "
 
+  # Get the element in the DOM hierachy that contains `element`.
+  # If the element is rendered in a shadow DOM via a <content> element, the <content> element will be
+  # returned, so the shadow DOM is traversed rather than passed over.
+  getContainingElement: (element) ->
+    element.getDestinationInsertionPoints()[0] or element.parentElement
+
 root = exports ? window
 root.DomUtils = DomUtils
-- 
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