diff --git a/layout/reftests/bugs/1419820-1-ref.html b/layout/reftests/bugs/1419820-1-ref.html
new file mode 100644
index 000000000000..070ce888f3de
--- /dev/null
+++ b/layout/reftests/bugs/1419820-1-ref.html
@@ -0,0 +1,6 @@
+<!doctype html>
+<html>
+<div>
+  <div style="width:100px; height:100px; background-color:green"></div>
+</html>
+
diff --git a/layout/reftests/bugs/1419820-1.html b/layout/reftests/bugs/1419820-1.html
new file mode 100644
index 000000000000..560d0c116048
--- /dev/null
+++ b/layout/reftests/bugs/1419820-1.html
@@ -0,0 +1,30 @@
+<!doctype html>
+<html>
+<body>
+<style>
+body
+{
+  transform-style: preserve-3d;
+}
+.absolute
+{
+  position: absolute;
+  width: 100px;
+  height: 100px;
+  transform: translateX(0%);
+  background-color: red;
+}
+.relative
+{
+  position: relative;
+  background-color: green;
+  width: 100px;
+  height: 100px;
+}
+</style>
+  <div>
+    <div class="absolute"></div>
+    <div class="relative"></div>
+  </div>
+</body>
+</html>
diff --git a/layout/reftests/bugs/reftest.list b/layout/reftests/bugs/reftest.list
index 28bc9ddf2ab3..ac1c70b375ae 100644
--- a/layout/reftests/bugs/reftest.list
+++ b/layout/reftests/bugs/reftest.list
@@ -2048,3 +2048,4 @@ needs-focus != 1377447-1.html 1377447-2.html
 == 1406183-1.html 1406183-1-ref.html
 == 1410028.html 1410028-ref.html
 test-pref(font.size.systemFontScale,200) == 1412743.html 1412743-ref.html
+== 1419820-1.html 1419820-1-ref.html
