diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index aa20b7fb70e..7c343382004 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -38,7 +38,6 @@ fragment=top != ../html/acid2.html acid2_ref.html
 == 2dcontext/lineto_a.html 2dcontext/lineto_ref.html
 == 2dcontext/transform_a.html 2dcontext/transform_ref.html
 
-== abs_float_pref_width_a.html abs_float_pref_width_ref.html
 == absolute_clipping_of_own_contents_a.html absolute_clipping_of_own_contents_ref.html
 == absolute_content_height_a.html absolute_content_height_ref.html
 == absolute_hypothetical_float_a.html absolute_hypothetical_float_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 110dd12da11..1386dc24326 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -15,6 +15,18 @@
     "deleted": [],
     "items": {
       "reftest": {
+        "css/abs_float_pref_width.html": [
+          {
+            "path": "css/abs_float_pref_width.html",
+            "references": [
+              [
+                "/_mozilla/css/abs_float_pref_width-ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/abs_float_pref_width.html"
+          }
+        ],
         "css/class-namespaces.html": [
           {
             "path": "css/class-namespaces.html",
@@ -535,6 +547,18 @@
           ],
           "url": "/_mozilla/css/class-namespaces.html"
         }
+      ],
+      "css/abs_float_pref_width.html": [
+        {
+          "path": "css/abs_float_pref_width.html",
+          "references": [
+            [
+              "/_mozilla/css/abs_float_pref_width-ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/abs_float_pref_width.html"
+        }
       ]
     }
   },
diff --git a/tests/ref/abs_float_pref_width_ref.html b/tests/wpt/mozilla/tests/css/abs_float_pref_width-ref.html
similarity index 100%
rename from tests/ref/abs_float_pref_width_ref.html
rename to tests/wpt/mozilla/tests/css/abs_float_pref_width-ref.html
diff --git a/tests/ref/abs_float_pref_width_a.html b/tests/wpt/mozilla/tests/css/abs_float_pref_width.html
similarity index 90%
rename from tests/ref/abs_float_pref_width_a.html
rename to tests/wpt/mozilla/tests/css/abs_float_pref_width.html
index 65714506722..2bd75d4da7b 100644
--- a/tests/ref/abs_float_pref_width_a.html
+++ b/tests/wpt/mozilla/tests/css/abs_float_pref_width.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html>
     <head>
+    <link rel=match href="abs_float_pref_width-ref.html">
     <style type="text/css">
         @font-face {
             font-family: 'ahem';
diff --git a/tests/wpt/mozilla/tests/css/fonts/ahem/COPYING b/tests/wpt/mozilla/tests/css/fonts/ahem/COPYING
new file mode 100644
index 00000000000..6327b904bed
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/fonts/ahem/COPYING
@@ -0,0 +1,36 @@
+The Ahem font in this directory belongs to the public domain. In
+jurisdictions that do not recognize public domain ownership of these
+files, the following Creative Commons Zero declaration applies:
+
+<http://labs.creativecommons.org/licenses/zero-waive/1.0/us/legalcode>
+
+which is quoted below:
+
+  The person who has associated a work with this document (the "Work")
+  affirms that he or she (the "Affirmer") is the/an author or owner of
+  the Work. The Work may be any work of authorship, including a
+  database.
+
+  The Affirmer hereby fully, permanently and irrevocably waives and
+  relinquishes all of her or his copyright and related or neighboring
+  legal rights in the Work available under any federal or state law,
+  treaty or contract, including but not limited to moral rights,
+  publicity and privacy rights, rights protecting against unfair
+  competition and any rights protecting the extraction, dissemination
+  and reuse of data, whether such rights are present or future, vested
+  or contingent (the "Waiver"). The Affirmer makes the Waiver for the
+  benefit of the public at large and to the detriment of the Affirmer's
+  heirs or successors.
+
+  The Affirmer understands and intends that the Waiver has the effect
+  of eliminating and entirely removing from the Affirmer's control all
+  the copyright and related or neighboring legal rights previously held
+  by the Affirmer in the Work, to that extent making the Work freely
+  available to the public for any and all uses and purposes without
+  restriction of any kind, including commercial use and uses in media
+  and formats or by methods that have not yet been invented or
+  conceived. Should the Waiver for any reason be judged legally
+  ineffective in any jurisdiction, the Affirmer hereby grants a free,
+  full, permanent, irrevocable, nonexclusive and worldwide license for
+  all her or his copyright and related or neighboring legal rights in
+  the Work.
diff --git a/tests/wpt/mozilla/tests/css/fonts/ahem/README b/tests/wpt/mozilla/tests/css/fonts/ahem/README
new file mode 100644
index 00000000000..7a4fcea05a1
--- /dev/null
+++ b/tests/wpt/mozilla/tests/css/fonts/ahem/README
@@ -0,0 +1,30 @@
+The Ahem font was developed by Todd Fahrner to help test writers
+develop predictable tests. The font's em square is exactly square.
+Its ascent and descent is exactly the size of the em square. This
+means that the font's extent is exactly the same as its line-height,
+meaning that it can be exactly aligned with padding, borders, margins,
+and so forth.
+
+The font's alphabetic baseline is 0.2em above its bottom, and 0.8em
+below its top. The font has an x-height of 0.8em.
+
+The font has four glyphs:
+
+  'X' U+0058 A square exactly 1em in height and width.
+
+  'p' U+0070 A rectangle exactly 0.2em high, 1em wide, and aligned so
+             that its top is flush with the baseline.
+
+  'É' U+00C9 A rectangle exactly 0.8em high, 1em wide, and aligned so
+             that its bottom is flush with the baseline.
+
+  ' ' U+0020 A transparent space exactly 1em high and wide.
+
+Most other US-ASCII characters in the font have the same glyph as X.
+
+The Ahem font belongs to the public domain as described in COPYING.
+
+Acknowledgements: The font was originally created by Todd Fahrner in
+the late 90s, and was updated by Paul Nelson in the mid 2000s. The
+changes were the introduction of x-height information to the OS/2
+table and the addition of the space and non-breaking space glyphs.
diff --git a/tests/wpt/mozilla/tests/css/fonts/ahem/ahem.ttf b/tests/wpt/mozilla/tests/css/fonts/ahem/ahem.ttf
new file mode 100644
index 00000000000..ac81cb03165
Binary files /dev/null and b/tests/wpt/mozilla/tests/css/fonts/ahem/ahem.ttf differ
