new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-properties-values-api/at-property-cssom.html.ini
@@ -0,0 +1,181 @@
+[at-property-cssom.html]
+  [Rule for --no-descriptors returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --valid returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --initial-value-only returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --no-syntax returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --valid returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --initial-value-only returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --valid-whitespace returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --valid-universal returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --valid-universal returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --valid-universal returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --valid-whitespace returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --no-syntax has expected cssText]
+    expected: FAIL
+
+  [Rule for --syntax-only returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --no-syntax returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --initial-value-only returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --no-initial-value has expected cssText]
+    expected: FAIL
+
+  [Rule for --no-syntax returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --no-initial-value returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --valid-whitespace has expected cssText]
+    expected: FAIL
+
+  [Rule for --syntax-only returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --no-descriptors returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --syntax-only returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --no-inherits returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --valid-whitespace returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --valid-reverse has expected cssText]
+    expected: FAIL
+
+  [Rule for --valid-reverse returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --no-inherits returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --vALId returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --no-inherits has expected cssText]
+    expected: FAIL
+
+  [Rule for --valid-reverse returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --vALId has expected cssText]
+    expected: FAIL
+
+  [Rule for --no-descriptors has expected cssText]
+    expected: FAIL
+
+  [Rule for --syntax-only has expected cssText]
+    expected: FAIL
+
+  [Rule for --valid-universal returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --initial-value-only has expected cssText]
+    expected: FAIL
+
+  [Rule for --syntax-only returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --no-syntax returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --inherits-only returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --no-initial-value returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --initial-value-only returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --inherits-only has expected cssText]
+    expected: FAIL
+
+  [Rule for --vALId returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --valid returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --no-initial-value returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --valid returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --valid-universal has expected cssText]
+    expected: FAIL
+
+  [Rule for --valid has expected cssText]
+    expected: FAIL
+
+  [Rule for --inherits-only returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --valid-reverse returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --no-descriptors returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --no-inherits returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --inherits-only returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --inherits-only returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --valid-whitespace returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --vALId returns expected value for CSSPropertyRule.name]
+    expected: FAIL
+
+  [Rule for --no-descriptors returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --valid-reverse returns expected value for CSSPropertyRule.initialValue]
+    expected: FAIL
+
+  [Rule for --vALId returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+
+  [Rule for --no-inherits returns expected value for CSSPropertyRule.syntax]
+    expected: FAIL
+
+  [Rule for --no-initial-value returns expected value for CSSPropertyRule.inherits]
+    expected: FAIL
+

new file mode 100644
--- /dev/null
+++ b/testing/web-platform/meta/css/css-properties-values-api/at-property.html.ini
@@ -0,0 +1,151 @@
+[at-property.html]
+  [Rule applied [<transform-list>, rotateX(0deg), false\]]
+    expected: FAIL
+
+  [Rule applied [<color>, rgb(1, 2, 3), false\]]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for ["false"\]]
+    expected: FAIL
+
+  [Rule applied [<number>, 2.5, false\]]
+    expected: FAIL
+
+  [Rule applied [<angle>, 42deg, false\]]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for [0\]]
+    expected: FAIL
+
+  [Rule applied [<angle>, 1turn, false\]]
+    expected: FAIL
+
+  [Rule applied [<length-percentage>, 10px, false\]]
+    expected: FAIL
+
+  [Rule applied [<length-percentage>, 10%, false\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for [rgb(255, 0, 0)\]]
+    expected: FAIL
+
+  [Rule applied [<integer>, 5, false\]]
+    expected: FAIL
+
+  [Attribute 'initial-value' returns expected value for [red\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for ["<color># | <image> | none"\]]
+    expected: FAIL
+
+  [Rule applied [*, if(){}, false\]]
+    expected: FAIL
+
+  [Rule applied [<color>, green, false\]]
+    expected: FAIL
+
+  [Inherited properties inherit]
+    expected: FAIL
+
+  [Attribute 'initial-value' returns expected value for [rgb(1, 2, 3)\]]
+    expected: FAIL
+
+  [Rule applied [<resolution>, 96dpi, false\]]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for [none\]]
+    expected: FAIL
+
+  [Non-inherited properties do not inherit]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for ["true"\]]
+    expected: FAIL
+
+  [Rule applied [<color>, tomato, false\]]
+    expected: FAIL
+
+  [Rule applied [<time>, 10s, false\]]
+    expected: FAIL
+
+  [Rule applied [<length>, 10px, false\]]
+    expected: FAIL
+
+  [Attribute 'initial-value' returns expected value for [var(--x)\]]
+    expected: FAIL
+
+  [Rule applied [<transform-list>, rotateX(0deg) translateX(10px), false\]]
+    expected: FAIL
+
+  [Rule applied [<length-percentage>, calc(10% + 10px), false\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for ["notasyntax"\]]
+    expected: FAIL
+
+  [Rule applied [<time>, 1000ms, false\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for ["foo | bar | baz"\]]
+    expected: FAIL
+
+  [Attribute 'initial-value' returns expected value for [if(){}\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for [foo | bar\]]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for [1\]]
+    expected: FAIL
+
+  [Rule applied [<image>, url("http://a/"), false\]]
+    expected: FAIL
+
+  [Attribute 'initial-value' returns expected value for [10px\]]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for [true\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for ["*"\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for ["<color>"\]]
+    expected: FAIL
+
+  [Attribute 'initial-value' returns expected value for [foo\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for [red\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for [<color>\]]
+    expected: FAIL
+
+  [Rule applied [<percentage>, 10%, false\]]
+    expected: FAIL
+
+  [Rule applied [<url>, url("http://a/"), false\]]
+    expected: FAIL
+
+  [Rule applied [<color>, tomato, true\]]
+    expected: FAIL
+
+  [Attribute 'syntax' returns expected value for ["<color> | none"\]]
+    expected: FAIL
+
+  [Rule applied [<resolution>, 50dppx, false\]]
+    expected: FAIL
+
+  [Initial values substituted as computed value]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for [calc(0)\]]
+    expected: FAIL
+
+  [Attribute 'inherits' returns expected value for [false\]]
+    expected: FAIL
+
+  [Rule applied [<transform-function>, rotateX(0deg), false\]]
+    expected: FAIL
+