diff --git a/tests/wpt/metadata/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html.ini b/tests/wpt/metadata/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html.ini
index c65930090be..53ab4250231 100644
--- a/tests/wpt/metadata/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html.ini
+++ b/tests/wpt/metadata/css/compositing/mix-blend-mode/mix-blend-mode-both-parent-and-blended-with-3D-transform.html.ini
@@ -1,3 +1,4 @@
 [mix-blend-mode-both-parent-and-blended-with-3D-transform.html]
   type: reftest
-  expected: FAIL
+  expected:
+    if os == "linux": FAIL
diff --git a/tests/wpt/mozilla/meta/css/text_decoration_underline_subpx_a.html.ini b/tests/wpt/mozilla/meta/css/text_decoration_underline_subpx_a.html.ini
new file mode 100644
index 00000000000..fb0e61c9144
--- /dev/null
+++ b/tests/wpt/mozilla/meta/css/text_decoration_underline_subpx_a.html.ini
@@ -0,0 +1,4 @@
+[text_decoration_underline_subpx_a.html]
+  bug: https://github.com/servo/servo/issues/23569
+  expected:
+    if os == "linux": FAIL