Auto merge of #5905 - Ms2ger:css, r=jdm

<!-- Reviewable:start -->
[<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/5905)
<!-- Reviewable:end -->

tests/ref/basic.list

@@ -38,9 +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
 
-== 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
 == acid1_a.html acid1_b.html
 == acid2_noscroll.html acid2_ref_broken.html
 == after_block_iteration.html after_block_iteration_ref.html

tests/wpt/mozilla/meta/MANIFEST.json

@@ -27,6 +27,42 @@
             "url": "/_mozilla/css/abs_float_pref_width.html"
           }
         ],
+        "css/absolute_clipping_of_own_contents.html": [
+          {
+            "path": "css/absolute_clipping_of_own_contents.html",
+            "references": [
+              [
+                "/_mozilla/css/absolute_clipping_of_own_contents_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/absolute_clipping_of_own_contents.html"
+          }
+        ],
+        "css/absolute_content_height.html": [
+          {
+            "path": "css/absolute_content_height.html",
+            "references": [
+              [
+                "/_mozilla/css/absolute_content_height_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/absolute_content_height.html"
+          }
+        ],
+        "css/absolute_hypothetical_float.html": [
+          {
+            "path": "css/absolute_hypothetical_float.html",
+            "references": [
+              [
+                "/_mozilla/css/absolute_hypothetical_float_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/absolute_hypothetical_float.html"
+          }
+        ],
         "css/class-namespaces.html": [
           {
             "path": "css/class-namespaces.html",
@@ -536,18 +572,6 @@
       }
     },
     "reftest_nodes": {
-      "css/class-namespaces.html": [
-        {
-          "path": "css/class-namespaces.html",
-          "references": [
-            [
-              "/_mozilla/css/class-namespaces-ref.html",
-              "=="
-            ]
-          ],
-          "url": "/_mozilla/css/class-namespaces.html"
-        }
-      ],
       "css/abs_float_pref_width.html": [
         {
           "path": "css/abs_float_pref_width.html",
@@ -559,6 +583,54 @@
           ],
           "url": "/_mozilla/css/abs_float_pref_width.html"
         }
+      ],
+      "css/absolute_clipping_of_own_contents.html": [
+        {
+          "path": "css/absolute_clipping_of_own_contents.html",
+          "references": [
+            [
+              "/_mozilla/css/absolute_clipping_of_own_contents_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/absolute_clipping_of_own_contents.html"
+        }
+      ],
+      "css/absolute_content_height.html": [
+        {
+          "path": "css/absolute_content_height.html",
+          "references": [
+            [
+              "/_mozilla/css/absolute_content_height_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/absolute_content_height.html"
+        }
+      ],
+      "css/absolute_hypothetical_float.html": [
+        {
+          "path": "css/absolute_hypothetical_float.html",
+          "references": [
+            [
+              "/_mozilla/css/absolute_hypothetical_float_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/absolute_hypothetical_float.html"
+        }
+      ],
+      "css/class-namespaces.html": [
+        {
+          "path": "css/class-namespaces.html",
+          "references": [
+            [
+              "/_mozilla/css/class-namespaces-ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/class-namespaces.html"
+        }
       ]
     }
   },

tests/wpt/mozilla/tests/css/absolute_clipping_of_own_contents.html

@@ -2,6 +2,7 @@
 <html>
 <head>
 <!-- Tests that clipping is preserved properly for nested `position: absolute` elements. -->
+<link rel=match href=absolute_clipping_of_own_contents_ref.html>
 <style>
 body, html {
     margin: 0;

tests/wpt/mozilla/tests/css/absolute_content_height.html

@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html>
 <head>
+<link rel=match href=absolute_content_height_ref.html>
 <style>
 section {
     position: absolute;

tests/wpt/mozilla/tests/css/absolute_hypothetical_float.html

@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <html>
 <head>
+<link rel=match href=absolute_hypothetical_float_ref.html>
 <style>
 #a {
     float: right;