diff --git a/layout/html/tests/formctls/bugs/bug48237.html b/layout/html/tests/formctls/bugs/bug48237.html
new file mode 100644
index 000000000000..e0f853ca7877
--- /dev/null
+++ b/layout/html/tests/formctls/bugs/bug48237.html
@@ -0,0 +1,36 @@
+<html>
+<head>
+<title>Testcase, bug 48237</title>
+<style type="text/css">
+
+div {
+  float: right;
+  border: 1px solid red;
+  width: 40%;
+}
+
+</style>
+</head>
+
+<body>
+
+<div>This is a float:right div.</div>
+
+<select>
+    <option>one</option>
+    <option>two</option>
+    <option>three</option>
+</select>
+
+<hr clear="all">
+
+<div>This is a float:right div.</div>
+
+<select size=3>
+    <option>one</option>
+    <option>two</option>
+    <option>three</option>
+</select>
+
+</body>
+</html>
diff --git a/layout/html/tests/formctls/bugs/file_list.txt b/layout/html/tests/formctls/bugs/file_list.txt
index 7daf9a4fc16f..aa69772144dd 100644
--- a/layout/html/tests/formctls/bugs/file_list.txt
+++ b/layout/html/tests/formctls/bugs/file_list.txt
@@ -28,6 +28,7 @@ file:///s|/mozilla/layout/html/tests/formctls/bugs/bug45562.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug45625.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug46099.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug46224.html
+file:///s|/mozilla/layout/html/tests/formctls/bugs/bug48237.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug50419.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug55063.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug58190.html
@@ -55,4 +56,4 @@ file:///s|/mozilla/layout/html/tests/formctls/bugs/bug94268.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug95703.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug95937.html
 file:///s|/mozilla/layout/html/tests/formctls/bugs/bug96604.html
-file:///s|/mozilla/layout/html/tests/formctls/bugs/bug98918.html
\ No newline at end of file
+file:///s|/mozilla/layout/html/tests/formctls/bugs/bug98918.html
