Backed out changeset 4ff8006a80f5 (bug 1557123) for causing a spike in wpts and wpts reftests intermittents.

taskcluster/ci/test/test-sets.yml

@@ -333,8 +333,8 @@ macosx1014-64-tests:
     - test-verify
     - test-verify-gpu
     - test-verify-wpt
-    - web-platform-tests
+    # - web-platform-tests
-    - web-platform-tests-reftests
+    # - web-platform-tests-reftests
     - web-platform-tests-wdspec
     # - xpcshell
 
@@ -356,6 +356,8 @@ macosx64-tests:
     - mochitest-webgl2-core
     # - mochitest-webgl2-ext test timeouts
     - telemetry-tests-client
+    - web-platform-tests
+    - web-platform-tests-reftests
     - xpcshell
 
 macosx64-talos:

testing/web-platform/meta/css/css-text-decor/text-emphasis-style-006.html.ini

@@ -2,4 +2,4 @@
   disabled:
     if (os == "android") and e10s: bug 1550895 (frequently fails on geckoview)
   fuzzy:
-    if os == "mac": maxDifference=0-96;totalPixels=0-12
+    if os == "mac": maxDifference=96;totalPixels=0-12

testing/web-platform/meta/css/css-values/ch-unit-001.html.ini

@@ -0,0 +1,3 @@
+[ch-unit-001.html]
+  expected:
+    if os == "mac": FAIL

testing/web-platform/meta/css/css-values/ch-unit-003.html.ini

@@ -0,0 +1,3 @@
+[ch-unit-003.html]
+  expected:
+    if (os == "mac"): FAIL

testing/web-platform/meta/css/css-values/ch-unit-004.html.ini

@@ -0,0 +1,3 @@
+[ch-unit-004.html]
+  expected:
+    if os == "mac": FAIL

testing/web-platform/meta/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html.ini

@@ -1,6 +1,4 @@
 [iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html]
   [Navigation resulted download in sandbox is blocked.]
-    disabled:
-        if (os == "mac") and (version == "OS X 10.14") and not debug: new os version
     expected: FAIL