diff --git a/src/test/ref/basic.list b/src/test/ref/basic.list
index ba962ad1a82..e9140ef13d4 100644
--- a/src/test/ref/basic.list
+++ b/src/test/ref/basic.list
@@ -1 +1,2 @@
+== basic_width_px.html basic_width_em.html
 == hello_a.html hello_b.html
diff --git a/src/test/ref/basic_width_em.html b/src/test/ref/basic_width_em.html
new file mode 100644
index 00000000000..160e2fa1ecb
--- /dev/null
+++ b/src/test/ref/basic_width_em.html
@@ -0,0 +1,16 @@
+<html>
+  <head>
+    <style>
+      html {
+        font-size: 20px;
+      }
+      p {
+        width: 10em;
+        border: solid 1px black;
+      }
+    </style>
+  </head>
+  <body>
+    <p>hello, wide world</p>
+  </body>
+</html>
diff --git a/src/test/ref/basic_width_px.html b/src/test/ref/basic_width_px.html
new file mode 100644
index 00000000000..660fa676246
--- /dev/null
+++ b/src/test/ref/basic_width_px.html
@@ -0,0 +1,16 @@
+<html>
+  <head>
+    <style>
+      html {
+        font-size: 20px;
+      }
+      p {
+        width: 200px;
+        border: solid 1px black;
+      }
+    </style>
+  </head>
+  <body>
+    <p>hello, wide world</p>
+  </body>
+</html>
