From c50365b1b5c05ca6c77386bac07547c4f08d6072 Mon Sep 17 00:00:00 2001
From: Richard Leon <rleon@somersicom>
Date: Tue, 29 Sep 2020 09:52:14 -0400
Subject: [PATCH 1/2] Calculate iframe offset using el.getBoundingClientRect()

---
 src/DragDropTouch.js | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/src/DragDropTouch.js b/src/DragDropTouch.js
index fafa035..8a52107 100644
--- a/src/DragDropTouch.js
+++ b/src/DragDropTouch.js
@@ -298,18 +298,14 @@ export default () => {
         // if target element is an iframe, try propagating event to child element
         if (el && el.nodeName === 'IFRAME') {
           try {
-            var iframeDocument = el.contentWindow.document;
-            // get iframe absolute offset
-            var iframeAbsoluteOffset = { x: 0, y: 0 };
-            do {
-              iframeAbsoluteOffset.x += el.offsetLeft || 0;
-              iframeAbsoluteOffset.y += el.offsetTop || 0;
-              el = el.offsetParent;
-            } while (el);
+            // get iframe absolute offset relative to viewport
+            var rect = el.getBoundingClientRect();
+            var iframeAbsoluteOffset = { x: rect.x, y: rect.y };
             // remove iframe absolute offset from touch position
             var x = pt.x - iframeAbsoluteOffset.x,
               y = pt.y - iframeAbsoluteOffset.y;
             // get element on that position from iframe document
+            var iframeDocument = el.contentWindow.document;
             el = iframeDocument.elementFromPoint(x, y);
           } catch (e) {
             // iframe origin don't allow access

From 0330d3ef4a15b9f96d3bad5e511f4c1bb7be7e60 Mon Sep 17 00:00:00 2001
From: Richard Leon <rleon@somersicom>
Date: Tue, 29 Sep 2020 09:58:28 -0400
Subject: [PATCH 2/2] Remove unnecessary variable declaration

---
 src/DragDropTouch.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/DragDropTouch.js b/src/DragDropTouch.js
index 8a52107..a59fcbd 100644
--- a/src/DragDropTouch.js
+++ b/src/DragDropTouch.js
@@ -300,10 +300,9 @@ export default () => {
           try {
             // get iframe absolute offset relative to viewport
             var rect = el.getBoundingClientRect();
-            var iframeAbsoluteOffset = { x: rect.x, y: rect.y };
             // remove iframe absolute offset from touch position
-            var x = pt.x - iframeAbsoluteOffset.x,
-              y = pt.y - iframeAbsoluteOffset.y;
+            var x = pt.x - rect.x,
+              y = pt.y - rect.y;
             // get element on that position from iframe document
             var iframeDocument = el.contentWindow.document;
             el = iframeDocument.elementFromPoint(x, y);