6 files changed, 27 insertions, 31 deletions
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 8ff4b84ce3..f784031f6a 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -6187,7 +6187,7 @@ nsGlobalWindow::GetScrollMaxY(ErrorResult& aError)
   FORWARD_TO_OUTER_OR_THROW(GetScrollBoundaryOuter, (eSideBottom), aError, 0);
 }
 
-CSSIntPoint
+CSSPoint
 nsGlobalWindow::GetScrollXY(bool aDoFlush)
 {
   MOZ_ASSERT(IsOuterWindow());
@@ -6211,30 +6211,30 @@ nsGlobalWindow::GetScrollXY(bool aDoFlush)
     return GetScrollXY(true);
   }
 
-  return sf->GetScrollPositionCSSPixels();
+  return CSSPoint::FromAppUnits(scrollPos);
 }
 
-int32_t
+double
 nsGlobalWindow::GetScrollXOuter()
 {
   MOZ_RELEASE_ASSERT(IsOuterWindow());
   return GetScrollXY(false).x;
 }
 
-int32_t
+double
 nsGlobalWindow::GetScrollX(ErrorResult& aError)
 {
   FORWARD_TO_OUTER_OR_THROW(GetScrollXOuter, (), aError, 0);
 }
 
-int32_t
+double
 nsGlobalWindow::GetScrollYOuter()
 {
   MOZ_RELEASE_ASSERT(IsOuterWindow());
   return GetScrollXY(false).y;
 }
 
-int32_t
+double
 nsGlobalWindow::GetScrollY(ErrorResult& aError)
 {
   FORWARD_TO_OUTER_OR_THROW(GetScrollYOuter, (), aError, 0);
diff --git a/dom/base/nsGlobalWindow.h b/dom/base/nsGlobalWindow.h
index eab91c2e4f..dbceeab742 100644
--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -1050,15 +1050,15 @@ public:
   void SetInnerHeight(JSContext* aCx, JS::Handle<JS::Value> aValue,
                       mozilla::dom::CallerType aCallerType,
                       mozilla::ErrorResult& aError);
-  int32_t GetScrollXOuter();
-  int32_t GetScrollX(mozilla::ErrorResult& aError);
-  int32_t GetPageXOffset(mozilla::ErrorResult& aError)
+  double GetScrollXOuter();
+  double GetScrollX(mozilla::ErrorResult& aError);
+  double GetPageXOffset(mozilla::ErrorResult& aError)
   {
     return GetScrollX(aError);
   }
-  int32_t GetScrollYOuter();
-  int32_t GetScrollY(mozilla::ErrorResult& aError);
-  int32_t GetPageYOffset(mozilla::ErrorResult& aError)
+  double GetScrollYOuter();
+  double GetScrollY(mozilla::ErrorResult& aError);
+  double GetPageYOffset(mozilla::ErrorResult& aError)
   {
     return GetScrollY(aError);
   }
@@ -1579,7 +1579,7 @@ public:
   // If aDoFlush is true, we'll flush our own layout; otherwise we'll try to
   // just flush our parent and only flush ourselves if we think we need to.
   // Outer windows only.
-  mozilla::CSSIntPoint GetScrollXY(bool aDoFlush);
+  mozilla::CSSPoint GetScrollXY(bool aDoFlush);
 
   int32_t GetScrollBoundaryOuter(mozilla::Side aSide);
 
diff --git a/dom/base/test/test_viewport_scroll.html b/dom/base/test/test_viewport_scroll.html
index 9b812360b2..7db02b7815 100644
--- a/dom/base/test/test_viewport_scroll.html
+++ b/dom/base/test/test_viewport_scroll.html
@@ -28,10 +28,10 @@ function subtest(winProp, elemProp, win, correctElement, elemToSet, otherElem1,
   win.scrollTo(50, 50);
   elemToSet[elemProp] = 100;
   if (elemToSet == correctElement) {
-    is(win[winProp], 100, "Setting " + elemToSet.name + "." + elemProp + " should scroll");
+    is(Math.round(win[winProp]), 100, "Setting " + elemToSet.name + "." + elemProp + " should scroll");
     is(elemToSet[elemProp], 100, "Reading back " + elemToSet.name + "." + elemProp + " after scrolling");
   } else {
-    is(win[winProp], 50, "Setting " + elemToSet.name + "." + elemProp + " should not scroll");
+    is(Math.round(win[winProp]), 50, "Setting " + elemToSet.name + "." + elemProp + " should not scroll");
     is(elemToSet[elemProp], 0, "Reading back " + elemToSet.name + "." + elemProp + " after not scrolling");
   }
   if (otherElem1 == correctElement) {
diff --git a/dom/browser-element/mochitest/browserElement_ScrollEvent.js b/dom/browser-element/mochitest/browserElement_ScrollEvent.js
index 5c4b4dcf97..06dc91b862 100644
--- a/dom/browser-element/mochitest/browserElement_ScrollEvent.js
+++ b/dom/browser-element/mochitest/browserElement_ScrollEvent.js
@@ -16,8 +16,8 @@ function runTest() {
   iframe.addEventListener("mozbrowserscroll", function(e) {
     ok(true, "got mozbrowserscroll event.");
     ok(e.detail, "event.detail is not null.");
-    ok(e.detail.top === 4000, "top position is correct.");
-    ok(e.detail.left === 4000, "left position is correct.");
+    ok(Math.round(e.detail.top) == 4000, "top position is correct.");
+    ok(Math.round(e.detail.left) == 4000, "left position is correct.");
     SimpleTest.finish();
   });
 
diff --git a/dom/tests/mochitest/general/test_domWindowUtils_scrollXY.html b/dom/tests/mochitest/general/test_domWindowUtils_scrollXY.html
index c6ee89ee35..cf27e5d87f 100644
--- a/dom/tests/mochitest/general/test_domWindowUtils_scrollXY.html
+++ b/dom/tests/mochitest/general/test_domWindowUtils_scrollXY.html
@@ -31,13 +31,13 @@
       function checkGetScrollXYState(flush, vals, testName) {
         let scrollX = {}, scrollY = {};
         domWindowUtils.getScrollXY(flush, scrollX, scrollY);
-        is(scrollX.value, vals[0], "getScrollXY x for test: " + testName);
-        is(scrollY.value, vals[1], "getScrollXY y for test: " + testName);
+        is(Math.round(scrollX.value), vals[0], "getScrollXY x for test: " + testName);
+        is(Math.round(scrollY.value), vals[1], "getScrollXY y for test: " + testName);
       }
 
       function checkWindowScrollState(vals, testName) {
-        is(cwindow.scrollX, vals[0], "scrollX for test: " + testName);
-        is(cwindow.scrollY, vals[1], "scrollY for test: " + testName);
+        is(Math.round(cwindow.scrollX), vals[0], "scrollX for test: " + testName);
+        is(Math.round(cwindow.scrollY), vals[1], "scrollY for test: " + testName);
       }
 
       // Check initial state (0, 0)
@@ -67,8 +67,8 @@
       let scrollX = {}, scrollY = {};
       domWindowUtils.getScrollXY(false, scrollX, scrollY);
 
-      is(scrollX.value, 0, "scrollX is zero for display:none iframe");
-      is(scrollY.value, 0, "scrollY is zero for display:none iframe");
+      is(Math.round(scrollX.value), 0, "scrollX is zero for display:none iframe");
+      is(Math.round(scrollY.value), 0, "scrollY is zero for display:none iframe");
     }
 
     SimpleTest.waitForExplicitFinish();
diff --git a/dom/webidl/Window.webidl b/dom/webidl/Window.webidl
index 055a274cc1..36b1f0313b 100644
--- a/dom/webidl/Window.webidl
+++ b/dom/webidl/Window.webidl
@@ -182,14 +182,10 @@ partial interface Window {
   [ChromeOnly] void mozScrollSnap();
   // The four properties below are double per spec at the moment, but whether
   // that will continue is unclear.
-  //[Replaceable, Throws] readonly attribute double scrollX;
-  //[Replaceable, Throws] readonly attribute double pageXOffset;
-  //[Replaceable, Throws] readonly attribute double scrollY;
-  //[Replaceable, Throws] readonly attribute double pageYOffset;
-  [Replaceable, Throws] readonly attribute long scrollX;
-  [Replaceable, Throws] readonly attribute long pageXOffset;
-  [Replaceable, Throws] readonly attribute long scrollY;
-  [Replaceable, Throws] readonly attribute long pageYOffset;
+  [Replaceable, Throws] readonly attribute double scrollX;
+  [Throws] readonly attribute double pageXOffset;
+  [Replaceable, Throws] readonly attribute double scrollY;
+  [Throws] readonly attribute double pageYOffset;
 
   // client
   // These are writable because we allow chrome to write them.  And they need