diff --git a/layout/html/tests/formctls/bugs/bug79927-3.html b/layout/html/tests/formctls/bugs/bug79927-3.html
new file mode 100644
index 00000000000..a1379ee0270
--- /dev/null
+++ b/layout/html/tests/formctls/bugs/bug79927-3.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<html>
+<head>
+<title>Button sizing testcase -- strict</title>
+</head>
+<body>
+<p>
+<input type="submit" value="l" disabled><select /><input type="file"><input type="submit" value="l">
+<input type="submit" value="aaaaaaaaaaaaaaaaaaaa">
+</p>
+<p>
+<input type="reset" value="l">
+<input type="reset" value="aaaaaaaaaaaaaaaaaaaa">
+</p>
+<p>
+<input type="button" value="l">
+<input type="button" value="aaaaaaaaaaaaaaaaaaaa">
+</p>
+<p>
+<button>l</button>
+<button>aaaaaaaaaaaaaaaaaaaa</button>
+</p>
+</body>
+</html>
\ No newline at end of file
diff --git a/layout/html/tests/formctls/bugs/rtest.lst b/layout/html/tests/formctls/bugs/rtest.lst
index 6f8abc4ca0b..2d4d7f2fe00 100644
--- a/layout/html/tests/formctls/bugs/rtest.lst
+++ b/layout/html/tests/formctls/bugs/rtest.lst
@@ -102,6 +102,7 @@ bug77068.html
 bug79863.html
 bug79927-1.html
 bug79927-2.html
+bug79927-3.html
 bug81448.html
 bug8665.html
 bug88849.html
