This is a testharness.js-based test. Found 48 FAIL, 0 TIMEOUT, 0 NOTRUN. [FAIL] FontFace interface: attribute features assert_true: The prototype object must have a property "features" expected true got false [FAIL] FontFace interface: attribute variations assert_true: The prototype object must have a property "variations" expected true got false [FAIL] FontFace interface: attribute palettes assert_true: The prototype object must have a property "palettes" expected true got false [FAIL] FontFace interface: fontFace must inherit property "features" with the proper type assert_inherits: property "features" not found in prototype chain [FAIL] FontFace interface: fontFace must inherit property "variations" with the proper type assert_inherits: property "variations" not found in prototype chain [FAIL] FontFace interface: fontFace must inherit property "palettes" with the proper type assert_inherits: property "palettes" not found in prototype chain [FAIL] FontFaceFeatures interface: existence and properties of interface object assert_own_property: self does not have own property "FontFaceFeatures" expected property "FontFaceFeatures" missing [FAIL] FontFaceFeatures interface object length assert_own_property: self does not have own property "FontFaceFeatures" expected property "FontFaceFeatures" missing [FAIL] FontFaceFeatures interface object name assert_own_property: self does not have own property "FontFaceFeatures" expected property "FontFaceFeatures" missing [FAIL] FontFaceFeatures interface: existence and properties of interface prototype object assert_own_property: self does not have own property "FontFaceFeatures" expected property "FontFaceFeatures" missing [FAIL] FontFaceFeatures interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "FontFaceFeatures" expected property "FontFaceFeatures" missing [FAIL] FontFaceFeatures interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "FontFaceFeatures" expected property "FontFaceFeatures" missing [FAIL] FontFaceVariationAxis interface: existence and properties of interface object assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface object length assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface object name assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: existence and properties of interface prototype object assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: attribute name assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: attribute axisTag assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: attribute minimumValue assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: attribute maximumValue assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariationAxis interface: attribute defaultValue assert_own_property: self does not have own property "FontFaceVariationAxis" expected property "FontFaceVariationAxis" missing [FAIL] FontFaceVariations interface: existence and properties of interface object assert_own_property: self does not have own property "FontFaceVariations" expected property "FontFaceVariations" missing [FAIL] FontFaceVariations interface object length assert_own_property: self does not have own property "FontFaceVariations" expected property "FontFaceVariations" missing [FAIL] FontFaceVariations interface object name assert_own_property: self does not have own property "FontFaceVariations" expected property "FontFaceVariations" missing [FAIL] FontFaceVariations interface: existence and properties of interface prototype object assert_own_property: self does not have own property "FontFaceVariations" expected property "FontFaceVariations" missing [FAIL] FontFaceVariations interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "FontFaceVariations" expected property "FontFaceVariations" missing [FAIL] FontFaceVariations interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "FontFaceVariations" expected property "FontFaceVariations" missing [FAIL] FontFaceVariations interface: setlike Cannot read properties of undefined (reading 'prototype') [FAIL] FontFacePalette interface: existence and properties of interface object assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface object length assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface object name assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface: existence and properties of interface prototype object assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface: iterable Cannot read properties of undefined (reading 'prototype') [FAIL] FontFacePalette interface: attribute length assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface: attribute usableWithLightBackground assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalette interface: attribute usableWithDarkBackground assert_own_property: self does not have own property "FontFacePalette" expected property "FontFacePalette" missing [FAIL] FontFacePalettes interface: existence and properties of interface object assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing [FAIL] FontFacePalettes interface object length assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing [FAIL] FontFacePalettes interface object name assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing [FAIL] FontFacePalettes interface: existence and properties of interface prototype object assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing [FAIL] FontFacePalettes interface: existence and properties of interface prototype object's "constructor" property assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing [FAIL] FontFacePalettes interface: existence and properties of interface prototype object's @@unscopables property assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing [FAIL] FontFacePalettes interface: iterable Cannot read properties of undefined (reading 'prototype') [FAIL] FontFacePalettes interface: attribute length assert_own_property: self does not have own property "FontFacePalettes" expected property "FontFacePalettes" missing Harness: the test ran to completion.