From a6ee639ecaf758fbe4652b5d70beaa607821ca04 Mon Sep 17 00:00:00 2001
From: gdh1995
Date: Thu, 22 Dec 2016 22:28:24 +0800
Subject: take documentElement's border into consideration

---
 lib/dom_utils.coffee | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'lib')

diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index 7232bb45..e6616f51 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -289,13 +289,14 @@ DomUtils =
     setTimeout((-> DomUtils.removeElement flashEl), 400)
 
   getViewportTopLeft: ->
-    style = getComputedStyle document.documentElement
+    box = document.documentElement
+    style = getComputedStyle box
     if style.position == "static" and not /content|paint|strict/.test(style.contain or "")
       zoom = +style.zoom || 1
       top: Math.ceil(window.scrollY / zoom), left: Math.ceil(window.scrollX / zoom)
     else
-      rect = document.documentElement.getBoundingClientRect()
-      top: -rect.top, left: -rect.left
+      rect = box.getBoundingClientRect()
+      top: -rect.top - box.clientTop, left: -rect.left - box.clientLeft
 
   suppressPropagation: (event) ->
     event.stopImmediatePropagation()
-- 
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