diff --git a/mozilla/layout/reftests/bugs/347912-1-ref.html b/mozilla/layout/reftests/bugs/347912-1-ref.html
new file mode 100644
index 00000000000..1d50b9f6123
--- /dev/null
+++ b/mozilla/layout/reftests/bugs/347912-1-ref.html
@@ -0,0 +1,14 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase, bug 347912</title>
+<style type="text/css">
+
+body { background: green; }
+
+</style>
+</head>
+<body>
+
+</body>
+</html>
diff --git a/mozilla/layout/reftests/bugs/347912-1.html b/mozilla/layout/reftests/bugs/347912-1.html
new file mode 100644
index 00000000000..19d3d7026f4
--- /dev/null
+++ b/mozilla/layout/reftests/bugs/347912-1.html
@@ -0,0 +1,40 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Testcase, bug 347912</title>
+<style type="text/css">
+
+body { background: green; }
+
+div { height: 10px; margin: 1em; }
+
+</style>
+</head>
+<body>
+
+<div style="background: red; background: transparent"></div>
+<div style="color: red; color: transparent">This is text</div>
+<div style="border: medium solid red; border-color: transparent"></div>
+<div style="border: medium solid red; border: medium solid transparent"></div>
+
+<div style="background: red; background: rgba(7, 35, 210, 0)"></div>
+<div style="color: red; color: rgba(7, 35, 210, 0)">This is text</div>
+<div style="border: medium solid red; border-color: rgba(7, 35, 210, 0)"></div>
+<div style="border: medium solid red; border: medium solid rgba(7, 35, 210, 0)"></div>
+
+<div style="color: red; color: rgba(7, 35, 210, 0.0)">This is text</div>
+<div style="color: red; color: rgba(7, 35, 210, .0)">This is text</div>
+<div style="color: red; color: rgba(7, 35, 210, .00000000000)">This is text</div>
+<div style="color: red; color: rgba(7, 35, 210, +.000)">This is text</div>
+<div style="color: red; color: rgba(7, 35, 210, +0.0)">This is text</div>
+<div style="color: red; color: rgba(7, 35, 210, +0)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, 0)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, 0.0)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, .0)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, .0000000000000)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, +.000)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, +0.0)">This is text</div>
+<div style="color: red; color: hsla(240, 40%, 20%, +0)">This is text</div>
+
+</body>
+</html>
diff --git a/mozilla/layout/reftests/reftest.list b/mozilla/layout/reftests/reftest.list
index bcadce8588f..3fe1e6c18b0 100644
--- a/mozilla/layout/reftests/reftest.list
+++ b/mozilla/layout/reftests/reftest.list
@@ -6,6 +6,7 @@
 # bugs/
 == bugs/142233-1.html bugs/142233-1-ref.html
 == bugs/339289-1.html bugs/339289-1-ref.html
+== bugs/347912-1.html bugs/347912-1-ref.html
 == bugs/351641-1a.html bugs/351641-1-ref.html
 == bugs/351641-1b.html bugs/351641-1-ref.html
 == bugs/351641-2a.html bugs/351641-2-ref.html
