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diff --git a/layout/reftests/font-features/font-variant-features.js b/layout/reftests/font-features/font-variant-features.js
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+++ b/layout/reftests/font-features/font-variant-features.js
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+
+// data associated with gsubtest test font for testing font features
+
+// prefix
+gPrefix = "";
+
+// equivalent properties
+// setting prop: value should match the specific feature settings listed
+//
+// each of these tests evaluate whether a given feature is enabled as required
+// and also whether features that shouldn't be enabled are or not.
+var gPropertyData = [
+  // font-variant (shorthand)
+  // valid values
+  { prop: "font-variant", value: "normal", features: {"smcp": 0} },
+  { prop: "font-variant", value: "small-caps", features: {"smcp": 1, "c2sc": 0} },
+  { prop: "font-variant", value: "none", features: {"liga": 0, "dlig": 0, "clig": 0, "calt": 0, "hlig": 0} },
+  { prop: "font-variant", value: "all-small-caps", features: {"smcp": 1, "c2sc": 1, "pcap": 0} },
+  { prop: "font-variant", value: "common-ligatures no-discretionary-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant", value: "proportional-nums slashed-zero diagonal-fractions oldstyle-nums ordinal", features: {"frac": 1, "afrc": 0, "tnum": 0, "pnum": 1, "onum": 1, "ordn": 1, "zero": 1} },
+  { prop: "font-variant", value: "all-small-caps traditional", features: {"smcp": 1, "c2sc": 1, "pcap": 0, "trad": 1, "jp04": 0} },
+  { prop: "font-variant", value: "styleset(out-of-bounds1, out-of-bounds2) traditional", features: {"ss00": 0, "ss01": 0, "ss99": 0, "trad": 1} }, // out-of-bounds values but not invalid syntax
+  { prop: "font-variant", value: "styleset(ok-alt-a, ok-alt-b) historical-forms", features: {"ss01": 1, "ss02": 0, "ss03": 1, "ss04": 0, "ss05": 1, "ss19": 1, "ss20": 0, "hist": 1, "hlig": 0} },
+  { prop: "font-variant", value: "traditional historical-forms styleset(ok-alt-a, ok-alt-b)", features: {"trad": 1, "ss01": 1, "ss02": 0, "ss03": 1, "ss04": 0, "ss05": 1, "ss19": 1, "ss20": 0, "hist": 1, "hlig": 0} },
+  { prop: "font-variant", value: "styleset(scope-test2)", features: {"ss23": 0, "ss24": 1, "ss01": 1} },
+  { prop: "font-variant", value: "character-variant(scope-test2)", features: {"cv23": 2, "cv24": 0, "cv01": 0} },
+
+  // invalid values
+  { prop: "font-variant", value: "normal small-caps", features: {"smcp": 0}, invalid: true },
+  { prop: "font-variant", value: "common-ligatures none", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant", value: "none common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant", value: "small-caps potato", features: {"smcp": 0}, invalid: true },
+  { prop: "font-variant", value: "common-ligatures traditional no-common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "trad": 0}, invalid: true },
+  { prop: "font-variant", value: "common-ligatures traditional common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "trad": 0}, invalid: true },
+  { prop: "font-variant", value: "small-caps jis83 all-small-caps", features: {"smcp": 0, "c2sc": 0, "jp83": 0}, invalid: true },
+  { prop: "font-variant", value: "lining-nums traditional slashed-zero ordinal normal", features: {"lnum": 0, "onum": 0, "zero": 0, "trad": 0}, invalid: true },
+  { prop: "font-variant", value: "diagonal-fractions stacked-fractions", features: {"frac": 0, "afrc": 0}, invalid: true },
+  { prop: "font-variant", value: "stacked-fractions diagonal-fractions historical-ligatures", features: {"frac": 0, "afrc": 0, "hlig": 0}, invalid: true },
+  { prop: "font-variant", value: "super sub", features: {"subs": 0, "sups": 0}, invalid: true },
+  { prop: "font-variant", value: "super historical-ligatures sub", features: {"subs": 0, "sups": 0, "hlig": 0}, invalid: true },
+  { prop: "font-variant", value: "annotation(circled) annotation(circled)", features: {"nalt": 0, "lnum": 0, "onum": 0, "pnum": 0}, invalid: true },
+
+  // font-variant-alternates
+  // valid values
+  { prop: "font-variant-alternates", value: "normal", features: {"salt": 0, "swsh": 0} },
+  { prop: "font-variant-alternates", value: "historical-forms", features: {"hist": 1, "hlig": 0} },
+  { prop: "font-variant-alternates", value: "styleset(ok-alt-a, ok-alt-b)", features: {"ss01": 1, "ss02": 0, "ss03": 1, "ss04": 0, "ss05": 1, "ss19": 1, "ss20": 0} },
+  { prop: "font-variant-alternates", value: "styleset(ok-alt-a, ok-alt-b) historical-forms", features: {"ss01": 1, "ss02": 0, "ss03": 1, "ss04": 0, "ss05": 1, "ss19": 1, "ss20": 0, "hist": 1, "hlig": 0} },
+  { prop: "font-variant-alternates", value: "historical-forms styleset(ok-alt-a, ok-alt-b)", features: {"ss01": 1, "ss02": 0, "ss03": 1, "ss04": 0, "ss05": 1, "ss19": 1, "ss20": 0, "hist": 1, "hlig": 0} },
+  { prop: "font-variant-alternates", value: "character-variant(ok-1)", features: {"cv78": 2, "cv79": 0, "cv77": 0} },
+  { prop: "font-variant-alternates", value: "character-variant(ok-1, ok-3)", features: {"cv78": 2, "cv79": 0, "cv77": 0, "cv23": 1, "cv22": 0, "cv24": 0} },
+  { prop: "font-variant-alternates", value: "annotation(circled)", features: {"nalt": 1} },
+  { prop: "font-variant-alternates", value: "styleset(out-of-bounds1, out-of-bounds2)", features: {"ss00": 0, "ss01": 0, "ss99": 0} }, // out-of-bounds values but not invalid syntax
+  { prop: "font-variant-alternates", value: "styleset(circled)", features: {"nalt": 0, "ss00": 0, "ss01": 0} }, // circled defined for annotation not styleset
+  { prop: "font-variant-alternates", value: "styleset(scope-test1)", features: {"ss23": 1, "ss24": 0} },
+  { prop: "font-variant-alternates", value: "character-variant(scope-test1)", features: {"cv23": 0, "cv24": 1} },
+  { prop: "font-variant-alternates", value: "styleset(scope-test2)", features: {"ss23": 0, "ss24": 1, "ss01": 1} },
+  { prop: "font-variant-alternates", value: "character-variant(scope-test2)", features: {"cv23": 2, "cv24": 0, "cv01": 0} },
+  { prop: "font-variant-alternates", value: "character-variant(overlap1, overlap2)", features: {"cv23": 2} },
+  { prop: "font-variant-alternates", value: "character-variant(overlap2, overlap1)", features: {"cv23": 1} },
+
+  // invalid values
+  { prop: "font-variant-alternates", value: "historical-forms normal", features: {"hist": 0}, invalid: true },
+  { prop: "font-variant-alternates", value: "historical-forms historical-forms", features: {"hist": 0}, invalid: true },
+  { prop: "font-variant-alternates", value: "swash", features: {"swsh": 0}, invalid: true },
+  { prop: "font-variant-alternates", value: "swash(3)", features: {"swsh": 0}, invalid: true },
+  { prop: "font-variant-alternates", value: "annotation(a, b)", features: {"nalt": 0}, invalid: true },
+  { prop: "font-variant-alternates", value: "ornaments(a,b)", features: {"ornm": 0, "nalt": 0}, invalid: true },
+
+  // font-variant-caps
+  // valid values
+  { prop: "font-variant-caps", value: "normal", features: {"smcp": 0} },
+  { prop: "font-variant-caps", value: "small-caps", features: {"smcp": 1, "c2sc": 0} },
+  { prop: "font-variant-caps", value: "all-small-caps", features: {"smcp": 1, "c2sc": 1, "pcap": 0} },
+  { prop: "font-variant-caps", value: "petite-caps", features: {"pcap": 1, "smcp": 0} },
+  { prop: "font-variant-caps", value: "all-petite-caps", features: {"c2pc": 1, "pcap": 1, "smcp": 0} },
+  { prop: "font-variant-caps", value: "titling-caps", features: {"titl": 1, "smcp": 0} },
+  { prop: "font-variant-caps", value: "unicase", features: {"unic": 1, "titl": 0} },
+
+  // invalid values
+  { prop: "font-variant-caps", value: "normal small-caps", features: {"smcp": 0}, invalid: true },
+  { prop: "font-variant-caps", value: "small-caps potato", features: {"smcp": 0}, invalid: true },
+  { prop: "font-variant-caps", value: "small-caps petite-caps", features: {"smcp": 0, "pcap": 0}, invalid: true },
+  { prop: "font-variant-caps", value: "small-caps all-small-caps", features: {"smcp": 0, "c2sc": 0}, invalid: true },
+  { prop: "font-variant-caps", value: "small-cap", features: {"smcp": 0}, invalid: true },
+
+  // font-variant-east-asian
+  // valid values
+  { prop: "font-variant-east-asian", value: "jis78", features: {"jp78": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "jis83", features: {"jp83": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "jis90", features: {"jp90": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "jis04", features: {"jp04": 1, "jp78": 0} },
+  { prop: "font-variant-east-asian", value: "simplified", features: {"smpl": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "traditional", features: {"trad": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "full-width", features: {"fwid": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "proportional-width", features: {"pwid": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "ruby", features: {"ruby": 1, "jp04": 0} },
+  { prop: "font-variant-east-asian", value: "jis78 full-width", features: {"jp78": 1, "fwid": 1, "jp83": 0} },
+  { prop: "font-variant-east-asian", value: "jis78 full-width ruby", features: {"jp78": 1, "fwid": 1, "jp83": 0, "ruby": 1} },
+  { prop: "font-variant-east-asian", value: "simplified proportional-width", features: {"smpl": 1, "pwid": 1, "jp83": 0} },
+  { prop: "font-variant-east-asian", value: "ruby simplified", features: {"ruby": 1, "smpl": 1, "trad": 0} },
+
+  // invalid values
+  { prop: "font-variant-east-asian", value: "ruby normal", features: {"ruby": 0}, invalid: true },
+  { prop: "font-variant-east-asian", value: "jis90 jis04", features: {"jp90": 0, "jp04": 0}, invalid: true },
+  { prop: "font-variant-east-asian", value: "simplified traditional", features: {"smpl": 0, "trad": 0}, invalid: true },
+  { prop: "font-variant-east-asian", value: "full-width proportional-width", features: {"fwid": 0, "pwid": 0}, invalid: true },
+  { prop: "font-variant-east-asian", value: "ruby simplified ruby", features: {"ruby": 0, "smpl": 0, "jp04": 0}, invalid: true },
+  { prop: "font-variant-east-asian", value: "jis78 ruby simplified", features: {"ruby": 0, "smpl": 0, "jp78": 0}, invalid: true },
+
+  // font-variant-ligatures
+  // valid values
+  { prop: "font-variant-ligatures", value: "none", features: {"liga": 0, "dlig": 0, "clig": 0, "calt": 0, "hlig": 0} },
+  { prop: "font-variant-ligatures", value: "normal", features: {"liga": 1, "dlig": 0} },
+  { prop: "font-variant-ligatures", value: "common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "no-common-ligatures", features: {"liga": 0, "clig": 0, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "discretionary-ligatures", features: {"liga": 1, "clig": 1, "dlig": 1, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "no-discretionary-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "historical-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 1, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "no-historical-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "contextual", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "no-contextual", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 0} },
+  { prop: "font-variant-ligatures", value: "common-ligatures no-discretionary-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "historical-ligatures no-common-ligatures", features: {"clig": 0, "liga": 0, "dlig": 0, "hlig": 1, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "no-historical-ligatures discretionary-ligatures", features: {"liga": 1, "clig": 1, "dlig": 1, "hlig": 0, "calt": 1} },
+  { prop: "font-variant-ligatures", value: "common-ligatures no-discretionary-ligatures historical-ligatures no-contextual", features: {"clig": 1, "dlig": 0, "hlig": 1, "liga": 1, "calt": 0} },
+
+  // invalid values
+  { prop: "font-variant-ligatures", value: "common-ligatures none", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "none common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "common-ligatures normal", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "common-ligatures no-common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "common-ligatures common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "no-historical-ligatures historical-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "no-contextual contextual", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "no-discretionary-ligatures discretionary-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+  { prop: "font-variant-ligatures", value: "common-ligatures no-discretionary-ligatures no-common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0}, invalid: true },
+
+  // font-variant-numeric
+  // valid values
+  { prop: "font-variant-numeric", value: "normal", features: {"lnum": 0, "tnum": 0, "pnum": 0, "onum": 0} },
+  { prop: "font-variant-numeric", value: "lining-nums", features: {"lnum": 1, "onum": 0, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "oldstyle-nums", features: {"lnum": 0, "onum": 1, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "proportional-nums", features: {"lnum": 0, "onum": 0, "pnum": 1, "tnum": 0} },
+  { prop: "font-variant-numeric", value: "proportional-nums oldstyle-nums", features: {"lnum": 0, "onum": 1, "pnum": 1, "tnum": 0} },
+  { prop: "font-variant-numeric", value: "tabular-nums", features: {"tnum": 1, "onum": 0, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "diagonal-fractions", features: {"frac": 1, "afrc": 0, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "stacked-fractions", features: {"frac": 0, "afrc": 1, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "slashed-zero", features: {"zero": 1, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "ordinal", features: {"ordn": 1, "pnum": 0} },
+  { prop: "font-variant-numeric", value: "lining-nums diagonal-fractions", features: {"frac": 1, "afrc": 0, "lnum": 1} },
+  { prop: "font-variant-numeric", value: "tabular-nums stacked-fractions", features: {"frac": 0, "afrc": 1, "tnum": 1} },
+  { prop: "font-variant-numeric", value: "tabular-nums slashed-zero stacked-fractions", features: {"frac": 0, "afrc": 1, "tnum": 1, "zero": 1} },
+  { prop: "font-variant-numeric", value: "proportional-nums slashed-zero diagonal-fractions oldstyle-nums ordinal", features: {"frac": 1, "afrc": 0, "tnum": 0, "pnum": 1, "onum": 1, "ordn": 1, "zero": 1} },
+
+  // invalid values
+  { prop: "font-variant-numeric", value: "lining-nums normal", features: {"lnum": 0, "onum": 0}, invalid: true },
+  { prop: "font-variant-numeric", value: "lining-nums oldstyle-nums", features: {"lnum": 0, "onum": 0}, invalid: true },
+  { prop: "font-variant-numeric", value: "lining-nums normal slashed-zero ordinal", features: {"lnum": 0, "onum": 0, "zero": 0}, invalid: true },
+  { prop: "font-variant-numeric", value: "proportional-nums tabular-nums", features: {"pnum": 0, "tnum": 0}, invalid: true },
+  { prop: "font-variant-numeric", value: "diagonal-fractions stacked-fractions", features: {"frac": 0, "afrc": 0}, invalid: true },
+  { prop: "font-variant-numeric", value: "slashed-zero diagonal-fractions slashed-zero", features: {"frac": 0, "afrc": 0, "zero": 0}, invalid: true },
+  { prop: "font-variant-numeric", value: "lining-nums slashed-zero diagonal-fractions oldstyle-nums", features: {"frac": 0, "afrc": 0, "zero": 0, "onum": 0}, invalid: true },
+
+  // font-variant-position
+  // valid values
+  { prop: "font-variant-position", value: "normal", features: {"subs": 0, "sups": 0} },
+
+  // note: because of fallback, can *only* test activated features here
+  { prop: "font-variant-position", value: "super", features: {"sups": 1} },
+  { prop: "font-variant-position", value: "sub", features: {"subs": 1} },
+
+  // invalid values
+  { prop: "font-variant-position", value: "super sub", features: {"subs": 0, "sups": 0}, invalid: true },
+];
+
+// note: the code below requires an array "gFeatures" from :
+//   layout/reftests/fonts/gsubtest/gsubtest-features.js
+
+// The font defines feature lookups for all OpenType features for a
+// specific set of PUA codepoints, as listed in the gFeatures array.
+// Using these codepoints and feature combinations, tests can be
+// constructed to detect when certain features are enabled or not.
+
+// return a created table containing tests for a given property
+//
+// Ex: { prop: "font-variant-ligatures", value: "common-ligatures", features: {"liga": 1, "clig": 1, "dlig": 0, "hlig": 0} }
+//
+// This means that for the property 'font-variant-ligatures' with the value 'common-ligatures', the features listed should
+// either be explicitly enabled or disabled.
+
+// propData is the prop/value list with corresponding feature assertions
+// whichProp is either "all" or a specific subproperty (i.e. "font-variant-position")
+// isRef is true when this is the reference
+// debug outputs the prop/value pair along with the tests
+
+// default PASS codepoint used for reference rendering
+// need to use a PUA codepoint to avoid problems related to Freetype auto-hinting
+const kRefCodepoint = 0xe00c;
+
+function createFeatureTestTable(propData, whichProp, isRef, debug)
+{
+  var table = document.createElement("table");
+
+  if (typeof(isRef) == "undefined") {
+    isRef = false;
+  }
+
+  if (typeof(debug) == "undefined") {
+    debug = false;
+  }
+
+  var doAll = (whichProp == "all");
+  for (var i in propData) {
+    var data = propData[i];
+
+    if (!doAll && data.prop != whichProp) continue;
+
+    var row = document.createElement("tr");
+    var invalid = false;
+    if ("invalid" in data) {
+      invalid = true;
+      row.className = "invalid";
+    }
+
+    var cell = document.createElement("td");
+    cell.className = "prop";
+    var styledecl = gPrefix + data.prop + ": " + data.value + ";";
+    cell.innerHTML = styledecl;
+    row.appendChild(cell);
+    if (debug) {
+      table.appendChild(row);
+    }
+
+    row = document.createElement("tr");
+    if (invalid) {
+      row.className = "invalid";
+    }
+
+    cell = document.createElement("td");
+    cell.className = "features";
+    if (!isRef) {
+      cell.style.cssText = styledecl;
+    }
+
+    for (var f in data.features) {
+      var feature = data.features[f];
+
+      var cp, unsupported = "F".charCodeAt(0);
+      var basecp = gFeatures[f];
+
+      if (typeof(basecp) == "undefined") {
+        cp = unsupported;
+      } else {
+        switch(feature) {
+        case 0:
+          cp = basecp;
+          break;
+        case 1:
+          cp = basecp + 1;
+          break;
+        case 2:
+          cp = basecp + 2;
+          break;
+        case 3:
+          cp = basecp + 3;
+          break;
+        default:
+          cp = basecp + 1;
+          break;
+        }
+      }
+
+      var span = document.createElement("span");
+      var cpOut = (isRef ? kRefCodepoint : cp);
+      span.innerHTML = "&#x" + cpOut.toString(16) + ";";
+      span.title = f + "=" + feature;
+      cell.appendChild(span);
+    }
+    row.appendChild(cell);
+    table.appendChild(row);
+  }
+
+  return table;
+}
+
+