From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 .../at-media-whitespace-optional-001.html          | 17 ++++++++
 .../at-media-whitespace-optional-002.html          | 17 ++++++++
 .../css-conditional-3/at-supports-001-ref.html     | 19 +++++++++
 .../css-conditional-3/at-supports-001.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-002.html         | 27 +++++++++++++
 .../css-conditional-3/at-supports-003.html         | 27 +++++++++++++
 .../css-conditional-3/at-supports-004.html         | 28 ++++++++++++++
 .../css-conditional-3/at-supports-005.html         | 28 ++++++++++++++
 .../css-conditional-3/at-supports-006.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-007.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-008.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-009.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-010.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-011.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-012.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-013.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-014.html         | 28 ++++++++++++++
 .../css-conditional-3/at-supports-015.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-016.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-017.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-018.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-019.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-020.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-021.html         | 24 ++++++++++++
 .../css-conditional-3/at-supports-022.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-023.html         | 27 +++++++++++++
 .../css-conditional-3/at-supports-024.html         | 24 ++++++++++++
 .../css-conditional-3/at-supports-025.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-026.html         | 26 +++++++++++++
 .../css-conditional-3/at-supports-027-ref.html     | 19 +++++++++
 .../css-conditional-3/at-supports-027.html         | 23 +++++++++++
 .../css-conditional-3/at-supports-028.html         | 24 ++++++++++++
 .../css-conditional-3/at-supports-029.html         | 23 +++++++++++
 .../css-conditional-3/at-supports-030.html         | 25 ++++++++++++
 .../css-conditional-3/at-supports-031.html         | 24 ++++++++++++
 .../css-conditional-3/at-supports-032.html         | 24 ++++++++++++
 .../css-conditional-3/at-supports-033.html         | 24 ++++++++++++
 .../css-conditional-3/at-supports-034.html         | 42 ++++++++++++++++++++
 .../css-conditional-3/at-supports-035.html         | 42 ++++++++++++++++++++
 .../css-conditional-3/at-supports-036.html         | 45 ++++++++++++++++++++++
 .../css-conditional-3/at-supports-037.html         | 43 +++++++++++++++++++++
 .../css-conditional-3/at-supports-038.html         | 42 ++++++++++++++++++++
 .../css-conditional-3/at-supports-039.html         | 42 ++++++++++++++++++++
 .../reference/background-lime.html                 | 14 +++++++
 44 files changed, 1179 insertions(+)
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-001.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-002.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-001-ref.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-001.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-002.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-003.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-004.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-005.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-006.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-007.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-008.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-009.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-010.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-011.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-012.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-013.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-014.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-015.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-016.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-017.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-018.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-019.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-020.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-021.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-022.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-023.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-024.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-025.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-026.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-027-ref.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-027.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-028.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-029.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-030.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-031.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-032.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-033.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-034.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-035.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-036.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-037.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-038.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/at-supports-039.html
 create mode 100644 layout/reftests/w3c-css/received/css-conditional-3/reference/background-lime.html

(limited to 'layout/reftests/w3c-css/received/css-conditional-3')

diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-001.html b/layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-001.html
new file mode 100644
index 000000000..49fd608dd
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-001.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+ <head>
+  <title>CSS Test: DESCRIPTION OF TEST</title>
+  <link rel="author" title="L. David Baron" href="https://dbaron.org/">
+  <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/">
+  <link rel="match" href="reference/background-lime.html">
+  <link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-media">
+  <meta name="assert" content="Whitespace after the MEDIA_SYM token is optional (S*).">
+  <style>
+   @media{ body { background: lime; color: black; } }
+  </style>
+ </head>
+ <body>
+   This page should have a light green background.
+ </body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-002.html b/layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-002.html
new file mode 100644
index 000000000..7ae37f5bf
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-media-whitespace-optional-002.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+ <head>
+  <title>CSS Test: DESCRIPTION OF TEST</title>
+  <link rel="author" title="L. David Baron" href="https://dbaron.org/">
+  <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/">
+  <link rel="match" href="reference/background-lime.html">
+  <link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-media">
+  <meta name="assert" content="Whitespace after the MEDIA_SYM token is optional (S*).">
+  <style>
+   @media(min-width:0px){ body { background: lime; color: black; } }
+  </style>
+ </head>
+ <body>
+   This page should have a light green background.
+ </body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-001-ref.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-001-ref.html
new file mode 100644
index 000000000..a8157aa75
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-001-ref.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Reftest Reference</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<style>
+			div {
+				background-color:green;
+				height:100px;
+				width:100px;
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-001.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-001.html
new file mode 100644
index 000000000..7e6b21f6d
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-001.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<head>
+	<title>CSS Test (Conditional Rules): Support for simple passing conditions in @supports</title>
+	<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+	<link rel="author" href="http://opera.com" title="Opera Software ASA">
+	<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+	<link rel="match" href="at-supports-001-ref.html">
+	<meta name="flags" content="">
+	<style>
+		div {
+			background-color:red;
+			height:100px;
+			width:100px;
+		}
+		@supports (margin: 0) {
+			div { background-color:green; }
+		}
+	</style>
+</head>
+<body>
+	<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+	<div>
+	</div>
+</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-002.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-002.html
new file mode 100644
index 000000000..d4b59ff36
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-002.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Support for @supports within @media</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@media all {
+				@supports (margin: 0) {
+					div { background-color:green; }
+				}
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-003.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-003.html
new file mode 100644
index 000000000..c138bbc30
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-003.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Support for @media within @supports</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 0) {
+				@media all{
+					div { background-color:green; }
+				}
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-004.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-004.html
new file mode 100644
index 000000000..6b9cf6f6b
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-004.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): @supports within non-matching @media should not apply</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin:0) { div { background-color:green; } }
+			@media not all {
+				@supports (margin: 0) {
+					div { background-color:red; }
+				}
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-005.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-005.html
new file mode 100644
index 000000000..67329e365
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-005.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): non-matching @media within @supports should not apply</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin:0) { div { background-color:green; } }
+			@supports (margin: 0) {
+				@media not all {
+					div { background-color:red; }
+				}
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-006.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-006.html
new file mode 100644
index 000000000..f5c646106
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-006.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Nested parens around conditions in @supports should work</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((margin: 0)) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-007.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-007.html
new file mode 100644
index 000000000..a8184274f
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-007.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Conjunctions of passing simple conditions in @supports should pass</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((margin: 0) and (display:inline-block !important)) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-008.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-008.html
new file mode 100644
index 000000000..f53b40c82
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-008.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Disjunctions with at least a passing simple condition in @supports should pass</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((margin: 0) or (foo: 15em)) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-009.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-009.html
new file mode 100644
index 000000000..ffe96f61a
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-009.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Negations of failing simple conditions in @supports should pass</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (not (yadayada: x, calc( 2/3 ))) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-010.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-010.html
new file mode 100644
index 000000000..d3716718c
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-010.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Combinations of conjuctions, disjunctions, and negations of simple conditions in @supports should work</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((yada: 2kg !trivial) or ((not (foo:bar)) and (((visibility:hidden))))) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-011.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-011.html
new file mode 100644
index 000000000..02e744e4b
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-011.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Conditions not enclosed in parens in @supports should not work</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin:0) { div { background-color:green; } }
+			@supports margin: 0 {
+				div { background-color:red; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-012.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-012.html
new file mode 100644
index 000000000..8a30ead2f
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-012.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Conjunctions with more than two terms in @supports should work</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((margin: 0) and (background: blue) and (padding:inherit)) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-013.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-013.html
new file mode 100644
index 000000000..619da8411
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-013.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Disjunction with more than two terms in @supports should work</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((yoyo: yaya) or (margin: 0) or (answer: 42)) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-014.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-014.html
new file mode 100644
index 000000000..c26d8057d
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-014.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Negations in @supports should not work if "not" isn't follow by a space</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (width: 0) {
+				div { background-color:green; }
+			}
+			@supports not(foo: baz) {
+				div { background-color:red; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-015.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-015.html
new file mode 100644
index 000000000..fe3d5e561
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-015.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Bizarre syntax that still conforms to the core grammar should succesfully parse in @supports</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (not (foo: baz !unrelated $ ,/[&])) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-016.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-016.html
new file mode 100644
index 000000000..f8feaa470
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-016.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): In @supports, parens are required to mix conjunctions with disjunctions</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div{
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin:0) { div { background-color:green; } }
+			@supports ((margin: 0) and (display: inline) or (width:1em)) {
+				div { background-color:red; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-017.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-017.html
new file mode 100644
index 000000000..81cbe4553
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-017.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): In @supports, functions can be parsed successfully</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (background: url("http://www.example.com/foo.jpg")) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-018.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-018.html
new file mode 100644
index 000000000..88bcedec9
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-018.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): In @supports conditions, the arguments of a function can begin with spaces</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="">
+		<style>
+			div {
+				background:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (not (width:compute( 2px + 2px ))) {
+				div { background-color:green; }
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-019.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-019.html
new file mode 100644
index 000000000..7e6bf448d
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-019.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: ) {
+				div { background-color:red !important; }
+			}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-020.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-020.html
new file mode 100644
index 000000000..eed31e5ea
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-020.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 2px) ) {
+				div { background-color:red !important; }
+			}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-021.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-021.html
new file mode 100644
index 000000000..a3fdc83cc
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-021.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin:0 );
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-022.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-022.html
new file mode 100644
index 000000000..ec41734b4
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-022.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports [margin: 0] {
+				div { background-color:red !important; }
+			}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-023.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-023.html
new file mode 100644
index 000000000..e3df4f6f7
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-023.html
@@ -0,0 +1,27 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in nested @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@media all {
+				@supports (width: 0)) {}
+				@supports (margin:0) { div { background-color:green !important; } }
+			}
+			div { background-color:red; }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-024.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-024.html
new file mode 100644
index 000000000..94827ff53
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-024.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports;
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-025.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-025.html
new file mode 100644
index 000000000..e7079ee5c
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-025.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ((margin:0) and [padding:0]) {
+				div { background-color:red !important; }
+			}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-026.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-026.html
new file mode 100644
index 000000000..842a0ad66
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-026.html
@@ -0,0 +1,26 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 0]) {
+				div { background-color:red !important; }
+			}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-027-ref.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-027-ref.html
new file mode 100644
index 000000000..9d1fbaaf4
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-027-ref.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Reftest Reference</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<style>
+			div {
+				background-color:green;
+				height:100px;
+				width:100px;
+			}
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-027.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-027.html
new file mode 100644
index 000000000..11a0ed1f0
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-027.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-027-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			@supports (margin:0) { div { background-color:green; } }
+			div {
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 0)
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-028.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-028.html
new file mode 100644
index 000000000..3abc95ebd
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-028.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 0)) {}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-029.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-029.html
new file mode 100644
index 000000000..b78a711fe
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-029.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-027-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			@supports (margin:0) { div { background-color:green; } }
+			div {
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 0) !
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-030.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-030.html
new file mode 100644
index 000000000..a2b66cfa6
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-030.html
@@ -0,0 +1,25 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin:0) { div { background-color:green; } }
+			@supports ((margin: 0) and ;
+			div { background-color:red; }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-031.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-031.html
new file mode 100644
index 000000000..2b4621d49
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-031.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports (margin: 0)) ;
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-032.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-032.html
new file mode 100644
index 000000000..d53deb175
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-032.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports {}
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-033.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-033.html
new file mode 100644
index 000000000..d2c682fb8
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-033.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html>
+	<head>
+		<title>CSS Test (Conditional Rules): Incorrect syntax in @supports recovers properly</title>
+		<link rel="author" title="Florian Rivoal" href="http://florian.rivoal.net/">
+		<link rel="author" href="http://opera.com" title="Opera Software ASA">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<style>
+			div {
+				background-color:red;
+				height:100px;
+				width:100px;
+			}
+			@supports ;
+			@supports (margin:0) { div { background-color:green; } }
+		</style>
+	</head>
+	<body>
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+		<div></div>
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-034.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-034.html
new file mode 100644
index 000000000..d9b9612ee
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-034.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>CSS Test (Conditional Rules): Incorrect syntax of supports condition</title>
+		<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports" title="6. Feature queries: the '@supports' rule">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<meta name="assert" content="Each individual single supports condition must be enclosed by one opening parenthesis '(' and one closing parenthesis ')'.">
+
+    <!--
+
+    supports_condition_in_parens
+      : ( '(' S* supports_condition ')' S* ) | supports_declaration_condition |
+        general_enclosed
+      ;
+
+    -->
+
+		<style>
+			div
+			{
+				background-color: red;
+				height: 100px;
+				width: 100px;
+			}
+
+			@supports (margin: 0 or padding: 0) {	div {background-color: red !important;} }
+
+			@supports (margin: 0) { div {background-color: green;} }
+		</style>
+	</head>
+
+	<body>
+
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+
+		<div></div>
+
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-035.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-035.html
new file mode 100644
index 000000000..23a706b32
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-035.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>CSS Test (Conditional Rules): Incorrect syntax of supports condition</title>
+		<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports" title="6. Feature queries: the '@supports' rule">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<meta name="assert" content="Each individual single supports condition must be enclosed by one opening parenthesis '(' and one closing parenthesis ')'.">
+
+    <!--
+
+    supports_condition_in_parens
+      : ( '(' S* supports_condition ')' S* ) | supports_declaration_condition |
+        general_enclosed
+      ;
+
+    -->
+
+		<style>
+			div
+			{
+				background-color: red;
+				height: 100px;
+				width: 100px;
+			}
+
+			@supports (margin: 0) { div {background-color: green;} }
+
+			@supports (margin: 0 or padding: 0) {	div {background-color: red;} }
+		</style>
+	</head>
+
+	<body>
+
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+
+		<div></div>
+
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-036.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-036.html
new file mode 100644
index 000000000..f352d5dbc
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-036.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>CSS Test (Conditional Rules): Incorrect syntax of supports condition</title>
+		<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports" title="6. Feature queries: the '@supports' rule">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<meta name="assert" content="Each individual single supports condition must be enclosed by one opening parenthesis '(' and one closing parenthesis ')'.">
+
+    <!--
+
+    supports_condition_in_parens
+      : ( '(' S* supports_condition ')' S* ) | supports_declaration_condition |
+        general_enclosed
+      ;
+
+    -->
+
+		<style>
+			div
+			{
+				background-color: red;
+				height: 100px;
+				width: 100px;
+			}
+
+			@supports (margin: 0 and padding: 0)
+			{
+				div {background-color: red !important;}
+			}
+
+			@supports (margin: 0) { div {background-color: green;} }
+		</style>
+	</head>
+
+	<body>
+
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+
+		<div></div>
+
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-037.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-037.html
new file mode 100644
index 000000000..7f23db6fd
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-037.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>CSS Test (Conditional Rules): Incorrect syntax of supports condition</title>
+		<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports" title="6. Feature queries: the '@supports' rule">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<meta name="assert" content="Each individual single supports condition must be enclosed by one opening parenthesis '(' and one closing parenthesis ')'.">
+
+    <!--
+
+    supports_condition_in_parens
+      : ( '(' S* supports_condition ')' S* ) | supports_declaration_condition |
+        general_enclosed
+      ;
+
+    -->
+
+		<style>
+			div
+			{
+				background-color: red;
+				height: 100px;
+				width: 100px;
+			}
+
+			@supports (margin: 0) { div {background-color: green;} }
+
+			@supports (margin: 0 and padding: 0) {	div {background-color: red;}	}
+
+		</style>
+	</head>
+
+	<body>
+
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+
+		<div></div>
+
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-038.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-038.html
new file mode 100644
index 000000000..868a1e1f9
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-038.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>CSS Test (Conditional Rules): a supports condition declaration can not end with a semi-colon</title>
+		<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports" title="6. Feature queries: the '@supports' rule">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<meta name="assert" content="Each individual single supports condition declaration can not end up with a semi-colon ';'. A semi-colon is a punctuation separator of multiple CSS declarations and thus is not part of an individual CSS declaration per se.">
+
+    <!--
+
+    supports_condition_in_parens
+      : ( '(' S* supports_condition ')' S* ) | supports_declaration_condition |
+        general_enclosed
+      ;
+
+    -->
+
+		<style>
+			div
+			{
+				background-color: red;
+				height: 100px;
+				width: 100px;
+			}
+
+			@supports (margin: 0;) { div {background-color: red !important;} }
+
+			@supports (margin: 0) { div {background-color: green;} }
+		</style>
+	</head>
+
+	<body>
+
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+
+		<div></div>
+
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/at-supports-039.html b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-039.html
new file mode 100644
index 000000000..58e7ac2f0
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/at-supports-039.html
@@ -0,0 +1,42 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>CSS Test (Conditional Rules): a supports condition declaration can not end with a semi-colon</title>
+		<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+		<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports" title="6. Feature queries: the '@supports' rule">
+		<link rel="match" href="at-supports-001-ref.html">
+		<meta name="flags" content="invalid">
+		<meta name="assert" content="Each individual single supports condition declaration can not end up with a semi-colon ';'. A semi-colon is a punctuation separator of multiple CSS declarations and thus is not part of an individual CSS declaration per se.">
+
+    <!--
+
+    supports_condition_in_parens
+      : ( '(' S* supports_condition ')' S* ) | supports_declaration_condition |
+        general_enclosed
+      ;
+
+    -->
+
+		<style>
+			div
+			{
+				background-color: red;
+				height: 100px;
+				width: 100px;
+			}
+
+			@supports (margin: 0) { div {background-color: green;} }
+
+			@supports (margin: 0;) { div {background-color: red;}	}
+		</style>
+	</head>
+
+	<body>
+
+		<p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p>
+
+		<div></div>
+
+	</body>
+</html>
diff --git a/layout/reftests/w3c-css/received/css-conditional-3/reference/background-lime.html b/layout/reftests/w3c-css/received/css-conditional-3/reference/background-lime.html
new file mode 100644
index 000000000..fcb243c7f
--- /dev/null
+++ b/layout/reftests/w3c-css/received/css-conditional-3/reference/background-lime.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html>
+ <head>
+  <title>CSS Test Reference</title>
+  <link rel="author" title="L. David Baron" href="https://dbaron.org/">
+  <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/">
+  <style>
+   body { background: lime; color: black; }
+  </style>
+ </head>
+ <body>
+   This page should have a light green background.
+ </body>
+</html>
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