diff --git a/layout/html/tests/block/bugs/185411-1.html b/layout/html/tests/block/bugs/185411-1.html
new file mode 100644
index 000000000000..5f08cece167f
--- /dev/null
+++ b/layout/html/tests/block/bugs/185411-1.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
+	"http://www.w3.org/TR/html4/strict.dtd">
+<html lang="en-US">
+<head>
+	<title></title>
+	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+	<meta http-equiv="Content-Style-Type" content="text/css">
+	<style type="text/css">
+
+	table { margin-left: auto; margin-right: auto; }
+	table:last-child { margin-right: 0; }
+	table:first-child { margin-left: 0; }
+	
+	div.constrained {
+		border: medium solid;
+		width: 20px;
+		margin: auto;
+	}
+
+	</style>
+</head>
+<body>
+
+<div>
+	<table border><tr><td>ABCDE</td></tr></table>
+	<table border><tr><td>ABCDE</td></tr></table>
+	<table border><tr><td>ABCDE</td></tr></table>
+</div>
+
+<div>
+	<table border width="5"><tr><td>ABCDE</td></tr></table>
+	<table border width="5"><tr><td>ABCDE</td></tr></table>
+	<table border width="5"><tr><td>ABCDE</td></tr></table>
+</div>
+
+<div>
+	<table border width="300"><tr><td>ABCDE</td></tr></table>
+	<table border width="300"><tr><td>ABCDE</td></tr></table>
+	<table border width="300"><tr><td>ABCDE</td></tr></table>
+</div>
+
+<div class="constrained">
+	<table border><tr><td>ABCDE</td></tr></table>
+	<table border><tr><td>ABCDE</td></tr></table>
+	<table border><tr><td>ABCDE</td></tr></table>
+</div>
+
+<div class="constrained">
+	<table border width="5"><tr><td>ABCDE</td></tr></table>
+	<table border width="5"><tr><td>ABCDE</td></tr></table>
+	<table border width="5"><tr><td>ABCDE</td></tr></table>
+</div>
+
+<div class="constrained">
+	<table border width="300"><tr><td>ABCDE</td></tr></table>
+	<table border width="300"><tr><td>ABCDE</td></tr></table>
+	<table border width="300"><tr><td>ABCDE</td></tr></table>
+</div>
+
+</body>
+</html>
diff --git a/layout/html/tests/block/bugs/185411-2.html b/layout/html/tests/block/bugs/185411-2.html
new file mode 100644
index 000000000000..3f562b42b957
--- /dev/null
+++ b/layout/html/tests/block/bugs/185411-2.html
@@ -0,0 +1,25 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
+            "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+  <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
+  <title>Inconsistency testcase</title>
+  <style type="text/css">
+div { margin-left: auto; margin-right: auto; margin-top: 1em; }
+  </style>
+</head>
+<body>
+<p>All divs have margin-left and margin-right set to auto.<p>
+<div style="width: 400px; border: 4px dashed green;">
+ <p style="text-align: center; font-weight: bold;">Containing block (400px)</p>
+
+ <div style="width: 500px; border-top: solid thin red; border-bottom: solid thin red;">
+  500px-wide div without left or right border
+ </div>
+
+ <div style="width: 500px; border: solid thin red;">
+  500px-wide div with left and right border
+ </div>
+</div>
+</body>
+</html>
diff --git a/layout/html/tests/block/bugs/185411-3.html b/layout/html/tests/block/bugs/185411-3.html
new file mode 100644
index 000000000000..3c522fd6211d
--- /dev/null
+++ b/layout/html/tests/block/bugs/185411-3.html
@@ -0,0 +1,24 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<title>Apple - iPod</title>
+</head>
+<body>
+
+<table width="100%" border="0" cellpadding="0" cellspacing="0" id="tabs">
+	<tr>
+		<td width="49%"><img src="logo-star.gif" width="1" height="52" alt=""></td>
+		<td width="2%" align="center">
+		<table width="725" border="0" cellpadding="0" cellspacing="0">
+			<tr>
+				<td width="725"><img src="logo-star.gif" width="725" height="32" alt=""></td>
+			</tr>
+		</table>
+		</td>
+		<td width="49%"><img src="logo-star.gif" width="1" height="52" alt=""></td>
+	</tr>
+</table>
+
+
+</body>
+</html>
diff --git a/layout/html/tests/block/bugs/file_list.txt b/layout/html/tests/block/bugs/file_list.txt
index 7713dba5c5ab..24d808359507 100644
--- a/layout/html/tests/block/bugs/file_list.txt
+++ b/layout/html/tests/block/bugs/file_list.txt
@@ -203,6 +203,9 @@ file:///s:/mozilla/layout/html/tests/block/bugs/161644.html
 file:///s:/mozilla/layout/html/tests/block/bugs/169620.html
 file:///s:/mozilla/layout/html/tests/block/bugs/176423.html
 file:///s:/mozilla/layout/html/tests/block/bugs/177331.html
+file:///s:/mozilla/layout/html/tests/block/bugs/185411-1.html
+file:///s:/mozilla/layout/html/tests/block/bugs/185411-2.html
+file:///s:/mozilla/layout/html/tests/block/bugs/185411-3.html
 file:///s:/mozilla/layout/html/tests/block/bugs/196919.html
 file:///s:/mozilla/layout/html/tests/block/bugs/215857.html
 file:///s:/mozilla/layout/html/tests/block/bugs/223394-1.html
