Make sure we handle both getter and setter for scrollTop etc

src/wrappers/HTMLElement.js

@@ -130,11 +130,15 @@
     }
   });
 
-  function getterRequiresRendering(name) {
-    defineGetter(HTMLElement, name, function() {
+  function getter(name) {
+    return function() {
       scope.renderAllPending();
       return this.impl[name];
-     });
+    };
+  }
+
+  function getterRequiresRendering(name) {
+    defineGetter(HTMLElement, name, getter(name));
   }
 
   [
@@ -147,11 +151,26 @@
     'offsetTop',
     'offsetWidth',
     'scrollHeight',
-    'scrollLeft',
-    'scrollTop',
     'scrollWidth',
   ].forEach(getterRequiresRendering);
 
+  function getterAndSetterRequiresRendering(name) {
+    Object.defineProperty(HTMLElement.prototype, name, {
+      get: getter(name),
+      set: function(v) {
+        scope.renderAllPending();
+        this.impl[name] = v;
+      },
+      configurable: true,
+      enumerable: true
+    });
+  }
+
+  [
+    'scrollLeft',
+    'scrollTop',
+  ].forEach(getterAndSetterRequiresRendering);
+
   function methodRequiresRendering(name) {
     Object.defineProperty(HTMLElement.prototype, name, {
       value: function() {

test/js/HTMLElement.js

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2013 The Polymer Authors. All rights reserved.
+ * Use of this source code is goverened by a BSD-style
+ * license that can be found in the LICENSE file.
+ */
+
+suite('HTMLElement', function() {
+
+  var div;
+
+  setup(function() {
+    div = document.body.appendChild(document.createElement('div'));
+    div.style.cssText =
+        'width: 100px; height: 100px; overflow: scroll;' +
+        'position: absolute; top: 100px; left: 100px;' +
+        'border: 10px solid red';
+    var sr = div.createShadowRoot();
+    var div2 = sr.appendChild(document.createElement('div'));
+    div2.style.cssText = 'width: 1000px; height: 1000px';
+  });
+
+  teardown(function() {
+    if (div && div.parentNode)
+      div.parentNode.removeChild(div);
+    div = undefined;
+  });
+
+  test('scrollTop', function() {
+    assert.equal(div.scrollTop, 0);
+    div.scrollTop = 100;
+    assert.equal(div.scrollTop, 100);
+  });
+
+  test('scrollLeft', function() {
+    assert.equal(div.scrollLeft, 0);
+    div.scrollLeft = 100;
+    assert.equal(div.scrollLeft, 100);
+  });
+
+  test('scrollHeight', function() {
+    assert.equal(div.scrollHeight, 1000);
+  });
+
+  test('scrollWidth', function() {
+    assert.equal(div.scrollHeight, 1000);
+  });
+
+  test('clientHeight', function() {
+    div.style.overflow = 'hidden';
+    assert.equal(div.clientHeight, 100);
+  });
+
+  test('clientLeft', function() {
+    div.style.overflow = 'hidden';
+    assert.equal(div.clientLeft, 10);
+  });
+
+  test('clientTop', function() {
+    assert.equal(div.clientTop, 10);
+  });
+
+  test('clientWidth', function() {
+    div.style.overflow = 'hidden';
+    assert.equal(div.clientWidth, 100);
+  });
+
+  test('offsetHeight', function() {
+    assert.equal(div.offsetHeight, 120);
+  });
+
+  test('offsetLeft', function() {
+    assert.equal(div.offsetLeft, 100);
+  });
+
+  test('offsetTop', function() {
+    assert.equal(div.offsetTop, 100);
+  });
+
+  test('offsetWidth', function() {
+    assert.equal(div.offsetWidth, 120);
+  });
+
+});

test/test.main.js

@@ -58,6 +58,7 @@ var modules = [
   'HTMLButtonElement.js',
   'HTMLCanvasElement.js',
   'HTMLContentElement.js',
+  'HTMLElement.js',
   'HTMLFieldSetElement.js',
   'HTMLHeadElement.js',
   'HTMLHtmlElement.js',