1 files changed, 20 insertions, 0 deletions
diff --git a/chromium/third_party/WebKit/Source/core/dom/DocumentTest.cpp b/chromium/third_party/WebKit/Source/core/dom/DocumentTest.cpp
index 1937e46252a..aadc52838ab 100644
--- a/chromium/third_party/WebKit/Source/core/dom/DocumentTest.cpp
+++ b/chromium/third_party/WebKit/Source/core/dom/DocumentTest.cpp
@@ -916,4 +916,24 @@ TEST_F(DocumentTest,
             GetDocument().Lifecycle().GetState());
 }
 
+// Tests that the difference in computed style of direction on the html and body
+// elements does not trigger a style recalc for viewport style propagation when
+// the computed style for another element in the document is recalculated.
+TEST_F(DocumentTest, ViewportPropagationNoRecalc) {
+  SetHtmlInnerHTML(
+      "<body style='direction:rtl'>"
+      "  <div id=recalc></div>"
+      "</body>");
+
+  int old_element_count = GetDocument().GetStyleEngine().StyleForElementCount();
+
+  Element* div = GetDocument().getElementById("recalc");
+  div->setAttribute("style", "color:green");
+  GetDocument().UpdateStyleAndLayoutTree();
+
+  int new_element_count = GetDocument().GetStyleEngine().StyleForElementCount();
+
+  EXPECT_EQ(1, new_element_count - old_element_count);
+}
+
 }  // namespace blink