From 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:47:29 +0200
Subject: Adding upstream version 115.8.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../tests/css/css-fonts/variations/META.yml        |   5 +
 .../variations/at-font-face-descriptors.html       | 174 ++++++++++++++++++
 .../variations/at-font-face-font-matching.html     | 195 +++++++++++++++++++++
 .../font-descriptor-range-reversed-ref.html        |  39 +++++
 .../variations/font-descriptor-range-reversed.html |  56 ++++++
 .../variations/font-opentype-collections.html      |  41 +++++
 .../font-parse-numeric-stretch-style-weight.html   | 146 +++++++++++++++
 .../css/css-fonts/variations/font-shorthand.html   |  69 ++++++++
 .../css/css-fonts/variations/font-slant-1-ref.html |  20 +++
 .../css/css-fonts/variations/font-slant-1.html     |  23 +++
 .../css/css-fonts/variations/font-slant-2-ref.html |  18 ++
 .../css/css-fonts/variations/font-slant-2a.html    |  22 +++
 .../css/css-fonts/variations/font-slant-2b.html    |  23 +++
 .../css/css-fonts/variations/font-slant-2c.html    |  23 +++
 .../css/css-fonts/variations/font-slant-3-ref.html |  23 +++
 .../css/css-fonts/variations/font-slant-3.html     |  27 +++
 .../css/css-fonts/variations/font-stretch.html     |  84 +++++++++
 .../variations/font-style-interpolation.html       |  89 ++++++++++
 .../css-fonts/variations/font-style-parsing.html   |  60 +++++++
 .../font-variation-settings-inherit.html           |  48 +++++
 .../variations/font-weight-interpolation.html      |  84 +++++++++
 .../variations/font-weight-lighter-bolder.html     |  58 ++++++
 .../font-weight-matching-installed-fonts.html      | 114 ++++++++++++
 .../css-fonts/variations/font-weight-matching.html | 135 ++++++++++++++
 .../variations/font-weight-metrics-ref.html        |  29 +++
 .../css-fonts/variations/font-weight-metrics.html  |  45 +++++
 .../css-fonts/variations/font-weight-parsing.html  |  53 ++++++
 .../resources/FontStyleTest-slnt-VF.woff2          | Bin 0 -> 20348 bytes
 .../FontStyleTest-slnt_backslant-VF.woff2          | Bin 0 -> 25612 bytes
 .../variations/resources/Inter.no-var.subset.ttf   | Bin 0 -> 2184 bytes
 .../variations/resources/Inter.var.subset.ttf      | Bin 0 -> 5080 bytes
 .../css/css-fonts/variations/resources/ahem.ttc    | Bin 0 -> 16028 bytes
 .../resources/csstest-weights-100-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-1479-w1-kerned.ttf   | Bin 0 -> 9296 bytes
 .../resources/csstest-weights-1479-w4-kerned.ttf   | Bin 0 -> 9232 bytes
 .../resources/csstest-weights-1479-w7-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-1479-w9-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-15-w1-kerned.ttf     | Bin 0 -> 9252 bytes
 .../resources/csstest-weights-15-w5-kerned.ttf     | Bin 0 -> 9200 bytes
 .../resources/csstest-weights-200-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-24-w2-kerned.ttf     | Bin 0 -> 9200 bytes
 .../resources/csstest-weights-24-w4-kerned.ttf     | Bin 0 -> 9188 bytes
 .../resources/csstest-weights-2569-w2-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-2569-w5-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-2569-w6-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-2569-w9-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-258-w2-kerned.ttf    | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-258-w5-kerned.ttf    | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-258-w8-kerned.ttf    | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-300-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-3589-w3-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-3589-w5-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-3589-w8-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-3589-w9-kerned.ttf   | Bin 0 -> 9240 bytes
 .../resources/csstest-weights-400-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-47-w4-kerned.ttf     | Bin 0 -> 9188 bytes
 .../resources/csstest-weights-47-w7-kerned.ttf     | Bin 0 -> 9200 bytes
 .../resources/csstest-weights-500-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-600-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-700-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-800-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-900-kerned.ttf       | Bin 0 -> 9044 bytes
 .../resources/csstest-weights-full-w1-kerned.ttf   | Bin 0 -> 9272 bytes
 .../resources/csstest-weights-full-w2-kerned.ttf   | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-full-w3-kerned.ttf   | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-full-w4-kerned.ttf   | Bin 0 -> 9212 bytes
 .../resources/csstest-weights-full-w5-kerned.ttf   | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-full-w6-kerned.ttf   | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-full-w7-kerned.ttf   | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-full-w8-kerned.ttf   | Bin 0 -> 9220 bytes
 .../resources/csstest-weights-full-w9-kerned.ttf   | Bin 0 -> 9220 bytes
 .../variations/resources/variabletest_box.ttf      | Bin 0 -> 4032 bytes
 .../variations/slnt-backslant-variable-ref.html    |  30 ++++
 .../variations/slnt-backslant-variable.html        |  41 +++++
 .../css-fonts/variations/slnt-variable-ref.html    |  25 +++
 .../css/css-fonts/variations/slnt-variable.html    |  36 ++++
 .../variations/variable-box-font-ref.html          |  20 +++
 .../css-fonts/variations/variable-box-font.html    |  31 ++++
 .../variations/variable-gpos-m2b-ref.html          |  21 +++
 .../css-fonts/variations/variable-gpos-m2b.html    |  45 +++++
 .../css-fonts/variations/variable-gsub-ref.html    |  21 +++
 .../css/css-fonts/variations/variable-gsub.html    |  34 ++++
 .../css-fonts/variations/variable-opsz-ref.html    |  27 +++
 .../variations/variable-opsz-size-adjust-ref.html  |  31 ++++
 .../variations/variable-opsz-size-adjust.html      |  39 +++++
 .../css/css-fonts/variations/variable-opsz.html    |  34 ++++
 86 files changed, 2138 insertions(+)
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/META.yml
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/at-font-face-descriptors.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/at-font-face-font-matching.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-opentype-collections.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-parse-numeric-stretch-style-weight.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-shorthand.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-1-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-1.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-2-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-2a.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-2b.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-2c.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-3-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-slant-3.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-stretch.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-style-interpolation.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-style-parsing.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-variation-settings-inherit.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-interpolation.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-lighter-bolder.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-matching-installed-fonts.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-matching.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/font-weight-parsing.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/FontStyleTest-slnt-VF.woff2
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/FontStyleTest-slnt_backslant-VF.woff2
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/Inter.no-var.subset.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/Inter.var.subset.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/ahem.ttc
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-100-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-1479-w1-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-1479-w4-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-1479-w7-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-1479-w9-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-15-w1-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-15-w5-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-200-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-24-w2-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-24-w4-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-2569-w2-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-2569-w5-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-2569-w6-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-2569-w9-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-258-w2-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-258-w5-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-258-w8-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-300-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-3589-w3-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-3589-w5-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-3589-w8-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-3589-w9-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-400-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-47-w4-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-47-w7-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-500-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-600-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-700-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-800-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-900-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w1-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w2-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w3-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w4-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w5-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w6-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w7-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w8-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/csstest-weights-full-w9-kerned.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/resources/variabletest_box.ttf
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/slnt-variable-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/slnt-variable.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-box-font-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-box-font.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-gsub-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-opsz-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust-ref.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust.html
 create mode 100644 testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html

(limited to 'testing/web-platform/tests/css/css-fonts/variations')

diff --git a/testing/web-platform/tests/css/css-fonts/variations/META.yml b/testing/web-platform/tests/css/css-fonts/variations/META.yml
new file mode 100644
index 0000000000..53487a6d85
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/META.yml
@@ -0,0 +1,5 @@
+suggested_reviewers:
+  - drott
+  - fantasai
+  - litherum
+  - svgeesus
diff --git a/testing/web-platform/tests/css/css-fonts/variations/at-font-face-descriptors.html b/testing/web-platform/tests/css/css-fonts/variations/at-font-face-descriptors.html
new file mode 100644
index 0000000000..1935422d7c
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/at-font-face-descriptors.html
@@ -0,0 +1,174 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing @font-face descriptor values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-face-rule" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style id="testStyle">
+        @font-face { font-family: Test; src: local('Courier New'), local('Courier'); }
+    </style>
+</head>
+<body>
+    <div>@font-face descriptor tests</div>
+    <script>
+
+        function updateFontFaceRule(descriptorName, descriptorValue) {
+            let testRule = document.getElementById("testStyle").sheet.cssRules[0];
+
+            testRule.style.fontWeight = "normal";
+            testRule.style.fontStyle = "normal";
+            testRule.style.fontStretch = "normal";
+            assert_equals(testRule.style.fontWeight, "normal", "Can't clear @font-face.");
+            assert_equals(testRule.style.fontStyle, "normal", "Can't clear @font-face.");
+            assert_equals(testRule.style.fontStretch,  "normal", "Can't clear @font-face.");
+
+            testRule.style.fontWeight = "";
+            testRule.style.fontStyle = "";
+            testRule.style.fontStretch = "";
+            assert_true(!testRule.style.fontWeight, "", "Can't clear @font-face.");
+            assert_true(!testRule.style.fontStyle, "", "Can't clear @font-face.");
+            assert_true(!testRule.style.fontStretch,  "", "Can't clear @font-face.");
+
+            testRule.style[descriptorName] = descriptorValue;
+
+            return testRule;
+        }
+
+        function testDescriptor(descriptorName, testCases) {
+            var propertyName = { 'font-weight':'fontWeight', 'font-stretch':'fontStretch', 'font-style':'fontStyle' }[descriptorName];
+            testCases.forEach(function (testCase) {
+                test(() => {
+                    let rule = updateFontFaceRule(descriptorName, testCase.value);
+
+                    if (testCase.isValid) {
+                        assert_not_equals(rule.style[propertyName], "", "Valid value should be accepted.");
+
+                        let expectedValue = (testCase.expectedValue) ? testCase.expectedValue : testCase.value;
+                        assert_equals(rule.style[propertyName], expectedValue, "Unexpected resulting value.");
+                    }
+                    else {
+                        assert_equals(rule.style[propertyName], "", "No properties should be set.");
+                    }
+                }, descriptorName + (testCase.isValid ? "(valid): " : "(invalid): ") + testCase.description + ": " + testCase.value);
+
+            });
+        }
+
+        testDescriptor("font-weight", [
+            // Single value, keyword
+            { value: "normal",                  isValid: true,  description: "'normal' keyword" },
+            { value: "bold",                    isValid: true,  description: "'bold' keyword" },
+            { value: "auto",                    isValid: true,  description: "'auto' keyword inside @font-face" },
+            { value: "lighter",                 isValid: false, description: "'lighter' keyword inside @font-face" },
+            { value: "bolder",                  isValid: false, description: "'bolder' keyword inside @font-face" },
+            { value: "bold a",                  isValid: false, description: "Extra content after keyword" },
+
+            // Single value, number
+            { value: "401",                     isValid: true,  description: "Values that are not multiple of 100 should be parsed successfully" },
+            { value: "400.1",                   isValid: true,  description: "Non-integer values should be parsed successfully" },
+            { value: "1",                       isValid: true,  description: "Minimum allowed value should be parsed successfully" },
+            { value: "0.999",                   isValid: false, description: "Values below minimum should be rejected" },
+            { value: "-100",                    isValid: false, description: "Values below zero should be rejected" },
+            { value: "1000",                    isValid: true,  description: "Maximum allowed value should be parsed successfully" },
+            { value: "1000.001",                isValid: false, description: "Values above maximum should be rejected" },
+            { value: "100 a",                   isValid: false, description: "Extra content after value" },
+
+            // Single value, calc
+            { value: "calc(100.5)",             isValid: true,  expectedValue: "100.5", description: "Simple calc value" },
+            { value: "calc(1001)",              isValid: true, description: "Out-of-range simple calc value (should be clamped)" },
+            { value: "calc(100.5*3 + 50.5)",    isValid: true,  expectedValue: "352", description: "Valid calc expression" },
+            { value: "calc(100.5*3 + 800)",     isValid: true, description: "Valid calc expression with out-of-range value (should be clamped)" },
+            { value: "calc(100.5px + 50.5px)",  isValid: false, description: "Valid calc expression with units" },
+
+            // Value range
+            { value: "100 900",                         isValid: true,  description: "Simple range" },
+            { value: "500 500",                         isValid: true,  expectedValue: "500", description: "Simple range with equal upper and lower bounds" },
+            { value: "0.9 100",                         isValid: false, description: "Lower bound out of range" },
+            { value: "100 1001",                        isValid: false, description: "Upper bound out of range" },
+            { value: "calc(100 + 100) 400",             isValid: true,  expectedValue: "200 400", description: "Lower bound calc()" },
+            { value: "200 calc(200 + 200)",             isValid: true,  expectedValue: "200 400", description: "Upper bound calc()" },
+            { value: "calc(100 + 100) calc(200 + 200)", isValid: true,  expectedValue: "200 400", description: "Both bounds are calc()" },
+            { value: "400 200",                         isValid: true,  expectedValue: "400 200", description: "Bounds out of order are valid" },
+            { value: "100 200 300",                     isValid: false, description: "Extra content after upper bound" },
+        ]);
+
+        testDescriptor("font-stretch", [
+            // Single value, keyword
+            { value: "ultra-condensed",         isValid: true,  description: "'ultra-condensed' keyword" },
+            { value: "extra-condensed",         isValid: true,  description: "'extra-condensed' keyword" },
+            { value: "condensed",               isValid: true,  description: "'condensed' keyword" },
+            { value: "semi-condensed",          isValid: true,  description: "'semi-condensed' keyword" },
+            { value: "normal",                  isValid: true,  description: "'normal' keyword" },
+            { value: "semi-expanded",           isValid: true,  description: "'semi-expanded' keyword" },
+            { value: "expanded",                isValid: true,  description: "'expanded' keyword" },
+            { value: "extra-expanded",          isValid: true,  description: "'extra-expanded' keyword" },
+            { value: "ultra-expanded",          isValid: true,  description: "'ultra-expanded' keyword" },
+            { value: "expanded a",              isValid: false, description: "Extra content after value" },
+            { value: "auto",                    isValid: true,  description: "'auto' keyword inside @font-face" },
+
+            // Single value, number
+            { value: "1%",                      isValid: true,  description:"Legal percentage" },
+            { value: "10.5%",                   isValid: true,  description:"Legal percentage" },
+            { value: "100%",                    isValid: true,  description:"Legal percentage" },
+            { value: "1000%",                   isValid: true,  description:"Legal percentage" },
+            { value: "100",                     isValid: false, description:"Only percentages, not numbers allowed" },
+            { value: "-1%",                     isValid: false, description:"Negative values are illegal" },
+            { value: "0%",                      isValid: true,  description:"Zero is legal" },
+            { value: "100% a",                  isValid: false, description:"Extra content after value" },
+
+            // Single value, calc
+            { value: "calc(200.5%)",            isValid: true,  expectedValue: "200.5%", description: "Simple calc value" },
+            { value: "calc(50%*2 - 20%)",       isValid: true,  expectedValue: "80%", description: "Valid calc expression" },
+            { value: "calc(-100%)",             isValid: true,  description: "Negative calc value (to be clamped)" },
+            { value: "calc(50% - 50%*2)",       isValid: true,  expectedValue: "calc(-50%)", description: "Negative calc expression (to be clamped)" },
+            { value: "calc(100)",               isValid: false, description: "Unit-less calc value" },
+            { value: "calc(100px)",             isValid: false, description: "Calc value with units" },
+
+            // Value range
+            { value: "100% 200%",                       isValid: true,  description: "Simple range" },
+            { value: "100% 100%",                       isValid: true,  expectedValue: "100%", description: "Simple range with equal upper and lower bounds" },
+            { value: "-100% 100%",                      isValid: false, description: "Lower bound out of range" },
+            { value: "calc(10% + 10%) 30%",             isValid: true,  expectedValue: "20% 30%", description: "Lower bound calc()" },
+            { value: "10% calc(10% + 10%)",             isValid: true,  expectedValue: "10% 20%", description: "Upper bound calc()" },
+            { value: "calc(10% + 10%) calc(20% + 20%)", isValid: true,  expectedValue: "20% 40%", description: "Both bounds are calc()" },
+            { value: "200% 100%",                       isValid: true,  expectedValue: "200% 100%", description: "Bounds out of order" },
+            { value: "100% 200% 300%",                  isValid: false, description: "Extra content after upper bound" },
+        ]);
+
+        testDescriptor("font-style", [
+            // Single value, keyword
+            { value: "normal",                  isValid: true,  description: "'normal' keyword" },
+            { value: "italic",                  isValid: true,  description: "'italic' keyword" },
+            { value: "oblique",                 isValid: true,  description: "'oblique' keyword" },
+            { value: "auto",                    isValid: true,  description: "'auto' keyword inside @font-face" },
+
+            // Single value
+            { value: "italic 20deg",            isValid: false, description: "'italic' followed by angle" },
+            { value: "italic a",                isValid: false, description: "Extra content after keyword" },
+            { value: "oblique 0deg",            isValid: true,  description: "'oblique' followed by zero degrees" },
+            { value: "oblique 20deg",           isValid: true,  description: "'oblique' followed by former default 20deg angle" },
+            { value: "oblique 90deg",           isValid: true,  description: "'oblique' followed by maxumum 90 degree angle" },
+            { value: "oblique -90deg",          isValid: true,  description: "'oblique' followed by minimum -90 degree angle" },
+            { value: "oblique calc(91deg)",     isValid: true,  description: "'oblique' followed by calc with out of range value (should be clamped)" },
+            { value: "oblique calc(-91deg)",    isValid: true,  description: "'oblique' followed by calc with out of range value (should be clamped)" },
+            { value: "oblique 0rad",            isValid: true,  expectedValue: "oblique 0deg", description: "'oblique' followed by angle in radians" },
+            { value: "oblique 20",              isValid: false, description: "'oblique' followed by unit-less number" },
+            { value: "oblique 20px",            isValid: false, description: "'oblique' followed by non-angle" },
+            { value: "oblique a",               isValid: false, description: "'oblique' followed by non-number" },
+            { value: "oblique -",               isValid: false, description: "'oblique' followed by isolated minus" },
+            { value: "oblique - 20deg",         isValid: false, description: "'oblique' followed by minus and angle separated by space" },
+            { value: "oblique -a",              isValid: false, description: "'oblique' followed by minus and non-number" },
+
+            // Value range
+            { value: "oblique 10deg 20deg",         isValid: true,  description: "Simple range" },
+            { value: "oblique 10deg 10deg",         isValid: true,  expectedValue: "oblique 10deg", description: "Simple range with equal upper and lower bounds" },
+            { value: "oblique 20deg 20deg",         isValid: true,  description: "Simple range with former default angle for both bounds" },
+            { value: "oblique 20deg 10deg",         isValid: true,  expectedValue: "oblique 20deg 10deg", description: "Bounds out of order" },
+            { value: "oblique -100deg 20deg",       isValid: false, description: "Lower bound out of range" },
+            { value: "oblique 20deg 100deg",        isValid: false, description: "Upper bound out of range" },
+            { value: "oblique 10deg 20deg 30deg",   isValid: false, description: "Extra content after upper bound" },
+        ]);
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/at-font-face-font-matching.html b/testing/web-platform/tests/css/css-fonts/variations/at-font-face-font-matching.html
new file mode 100644
index 0000000000..e56334f2da
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/at-font-face-font-matching.html
@@ -0,0 +1,195 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing @font-face font matching logic introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-matching-algorithm" />
+    <meta name="timeout" content="long">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+        .test
+        {
+            float:left;
+            border:1px solid red;
+            font-size:24pt;
+            white-space: nowrap;
+            clear:both;
+        }
+
+        @font-face { font-family: W100; src: url('./resources/csstest-weights-100-kerned.ttf'); }
+        @font-face { font-family: W200; src: url('./resources/csstest-weights-200-kerned.ttf'); }
+        @font-face { font-family: W300; src: url('./resources/csstest-weights-300-kerned.ttf'); }
+
+
+        @font-face { font-family: descriptorPriorityTest; src: url('./resources/csstest-weights-100-kerned.ttf'); font-stretch : 125%; }
+        @font-face { font-family: descriptorPriorityTest; src: url('./resources/csstest-weights-200-kerned.ttf'); font-style: italic; }
+        @font-face { font-family: descriptorPriorityTest; src: url('./resources/csstest-weights-300-kerned.ttf'); font-weight: 350; }
+    </style>
+    <style id="dynamicStyles">
+    </style>
+</head>
+<body>
+
+    <span style="position: absolute; top: -100vh;">
+        <span style="font-family: 'W100';">A</span>
+        <span style="font-family: 'W200';">A</span>
+        <span style="font-family: 'W300';">A</span>
+        <span style="font-family: 'descriptorPriorityTest'; font-stretch: 125%;">A</span>
+        <span style="font-family: 'descriptorPriorityTest'; font-style: italic;">A</span>
+        <span style="font-family: 'descriptorPriorityTest'; font-weight: 350;">A</span>
+    </span>
+
+    <div id="master" class="test">A1 A2 A2 A3 A3 A3</div>
+    <div id="test" class="test">A1 A2 A2 A3 A3 A3</div>
+    <div style="clear:both"></div>
+    <script>
+
+        // wait for the fonts to load
+        // -- this should not be necessary if the fonts are installed as required
+        // -- but if they are not, the test is otherwise unstable
+        var once_fonts_are_ready = (document.fonts ? document.fonts.ready : new Promise(function(ready) { window.onload = time => [...document.querySelectorAll('body > span:nth-child(1) > span')].every(e => e.offsetWidth > 20) ? ready() : requestAnimationFrame(window.onload) }));
+
+        var masterElement = document.getElementById("master");
+        var testElement = document.getElementById("test");
+        var dynamicStyles = document.getElementById("dynamicStyles");
+
+        function verifyFont(testFamily, testWeight, testStyle, testStretch, expectedFamily) {
+
+            testElement.style.fontWeight  = "normal";
+            testElement.style.fontStyle   = "normal";
+            testElement.style.fontStretch = "normal";
+
+            masterElement.style.fontFamily = expectedFamily;
+            let masterWidth = masterElement.offsetWidth;
+
+            testElement.style.fontFamily = expectedFamily;
+            assert_equals(masterWidth, testElement.offsetWidth, "Sanity test: same family name gets same width" + dynamicStyles.innerHTML);
+
+            testElement.style.fontFamily = "serif";
+            assert_not_equals(masterWidth, testElement.offsetWidth, "Sanity test: different family get different width");
+
+            testElement.style.fontWeight = testWeight;
+            testElement.style.fontStyle  = testStyle;
+            testElement.style.fontStretch = testStretch;
+            testElement.style.fontFamily = testFamily;
+
+            assert_equals(masterWidth, testElement.offsetWidth, "Unexpected font on test element");
+        }
+
+        var descriptorPriorityCases = [
+            { weight: "normal", style: "oblique -5deg", stretch: "125%",   expectedFamily: "'W100'", description: "Stretch has higher priority than style"},
+            { weight: "350",    style: "normal",        stretch: "125%",   expectedFamily: "'W100'", description: "Stretch has higher priority than weight"},
+            { weight: "350",    style: "oblique -5deg", stretch: "normal", expectedFamily: "'W200'", description: "Style has higher priority than weight"}
+        ];
+
+        descriptorPriorityCases.forEach(function (testCase) {
+            promise_test(() => {
+                return once_fonts_are_ready
+                    .then(() => verifyFont("descriptorPriorityTest", testCase.weight, testCase.style, testCase.stretch, testCase.expectedFamily));
+                },
+                "Descriptor matching priority: " + testCase.description
+            );
+        });
+
+        function load(family, name, value) {
+            const el1 = document.createElement("span");
+            const el2 = document.createElement("span");
+            el1.innerText = "A";
+            el2.innerText = "A";
+            let value1, value2;
+            if (value.indexOf("deg") > 0) {
+                value1 = "oblique " + value.split(" ")[1];
+                value2 = "oblique " + (value.split(" ")[2] || value.split(" ")[1]);
+            } else {
+                value1 = value.split(" ")[0];
+                value2 = value.split(" ")[1] || value1;
+            }
+            el1.style[name] = value1;
+            el2.style[name] = value2;
+            document.body.appendChild(el1);
+            document.body.appendChild(el2);
+            const initialWidth1 = el1.offsetWidth;
+            const initialWidth2 = el2.offsetWidth;
+            return new Promise((resolve) => {
+                el1.style.fontFamily = family;
+                el2.style.fontFamily = family;
+                (function check() {
+                    if (el1.offsetWidth !== initialWidth1 && el2.offsetWidth !== initialWidth2) {
+                        el1.remove();
+                        el2.remove();
+                        resolve();
+                    } else {
+                        requestAnimationFrame(check);
+                    }
+                }());
+            });
+        }
+        function createFontFaceRules(fontFaceFamily, descriptorName, expectedMatch, unexpectedMatch) {
+            dynamicStyles.innerHTML =
+                "@font-face { font-family: " + fontFaceFamily + "; src: url('./resources/csstest-weights-100-kerned.ttf'); "+ descriptorName + ": " + expectedMatch   + "; }" +
+                "@font-face { font-family: " + fontFaceFamily + "; src: url('./resources/csstest-weights-200-kerned.ttf'); " + descriptorName + ": " + unexpectedMatch + "; }";
+
+            return Promise.all([
+                load(fontFaceFamily, descriptorName, expectedMatch),
+                load(fontFaceFamily, descriptorName, unexpectedMatch)
+            ]);
+        }
+
+        let familyId = 0;
+
+        function testDescriptor(descriptorName, testCases) {
+            testCases.forEach(function (testCase) {
+                    // Go though test cases, checking each descriptor has higher priority than next in the list
+                    for(let i = 0; i < testCase.testDescriptors.length - 1; i++) {
+                        let expectedMatch   = testCase.testDescriptors[i];
+                        let unexpectedMatch = testCase.testDescriptors[i + 1];
+                        familyId += 1;
+                        const family = "MatchTestFamily" + familyId;
+
+                        promise_test(
+                            () => {
+                                return createFontFaceRules(family, descriptorName, expectedMatch, unexpectedMatch)
+                                    .then(() => {
+                                        let testWeight  = (descriptorName == "font-weight")  ? testCase.value : "normal";
+                                        let testStyle   = (descriptorName == "font-style")   ? testCase.value : "normal";
+                                        let testStretch = (descriptorName == "font-stretch") ? testCase.value : "normal";
+
+                                        verifyFont(family, testWeight, testStyle, testStretch, "'W100'");
+                                    });
+                            },
+                            "Matching " + descriptorName + ": '" + testCase.value + "' should prefer '" + expectedMatch + "' over '" + unexpectedMatch + "'");
+                    }
+            });
+        }
+
+        // Each case defines property value being tested and set of descriptor values in order of matching priority from highest to lowest
+
+        testDescriptor("font-weight", [
+            { value: "400", testDescriptors: ["400", "450 460", "500", "350 399", "351 398", "501 550", "502 560"] },
+            { value: "430", testDescriptors: ["420 440", "450 460", "500", "400 425", "350 399", "340 398", "501 550", "502 560"] },
+            { value: "500", testDescriptors: ["500", "450 460", "400", "350 399", "351 398", "501 550", "502 560"] },
+            { value: "501", testDescriptors: ["501", "502 510", "503 520", "500", "450 460", "390 410", "300 350"] },
+            { value: "399", testDescriptors: ["350 399", "340 360", "200 300", "400", "450 460", "500 501", "502 510"] }
+        ]);
+
+        testDescriptor("font-stretch", [
+            { value: "100%", testDescriptors: ["100%", "110% 120%", "115% 116%"] },
+            { value: "110%", testDescriptors: ["110% 120%", "115% 116%", "105%", "100%", "50% 80%", "60% 70%"] },
+            { value: "90%",  testDescriptors: ["90% 100%", "50% 80%", "60% 70%", "110% 140%", "120% 130%"] },
+        ]);
+
+        testDescriptor("font-style", [
+            { value: "normal",         testDescriptors: ["normal", "oblique 0deg", "oblique 10deg 40deg", "oblique 20deg 30deg", "oblique -50deg -20deg", "oblique -40deg -30deg" ] },
+            { value: "italic",         testDescriptors: ["italic", "oblique 20deg", "oblique 30deg 60deg", "oblique 40deg 50deg", "oblique 5deg 10deg", "oblique 5deg", "normal", "oblique 0deg", "oblique -60deg -30deg", "oblique -50deg -40deg" ] },
+            { value: "oblique 20deg",  testDescriptors: ["oblique 20deg", "oblique 30deg 60deg", "oblique 40deg 50deg", "oblique 10deg", "italic", "oblique 0deg", "oblique -50deg -20deg", "oblique -40deg -30deg" ] },
+            { value: "oblique 21deg",  testDescriptors: ["oblique 21deg", "oblique 30deg 60deg", "oblique 40deg 50deg", "oblique 20deg", "oblique 10deg", "italic", "oblique 0deg",  "oblique -50deg -20deg", "oblique -40deg -30deg" ] },
+            { value: "oblique 10deg",  testDescriptors: ["oblique 10deg", "oblique 5deg", "oblique 15deg 20deg", "oblique 30deg 60deg", "oblique 40deg 50deg", "italic", "oblique 0deg", "oblique -50deg -20deg", "oblique -40deg -30deg" ] },
+            { value: "oblique 0deg",   testDescriptors: ["oblique 0deg", "oblique 5deg", "oblique 15deg 20deg", "oblique 30deg 60deg", "oblique 40deg 50deg", "italic", "oblique -50deg -20deg", "oblique -40deg -30deg" ] },
+            { value: "oblique -10deg", testDescriptors: ["oblique -10deg", "oblique -5deg", "oblique -1deg 0deg", "oblique -20deg -15deg", "oblique -60deg -30deg", "oblique -50deg -40deg", "italic", "oblique 0deg 10deg", "oblique 40deg 50deg" ] },
+            { value: "oblique -20deg", testDescriptors: ["oblique -20deg", "oblique -60deg -40deg", "oblique -10deg", "italic", "oblique 0deg", "oblique 30deg 60deg", "oblique 40deg 50deg"] },
+            { value: "oblique -21deg", testDescriptors: ["oblique -21deg", "oblique -60deg -40deg", "oblique -10deg", "italic", "oblique 0deg", "oblique 30deg 60deg", "oblique 40deg 50deg"] },
+        ]);
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed-ref.html b/testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed-ref.html
new file mode 100644
index 0000000000..fc2b7aca29
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed-ref.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<title>CSS Reference</title>
+
+<style>
+@font-face {
+  font-family: TestWeight;
+  src: url(resources/csstest-weights-100-kerned.ttf);
+  font-weight: 200 300;
+}
+@font-face {
+  font-family: TestWeight;
+  src: url(resources/csstest-weights-900-kerned.ttf);
+  font-weight: 300 400;
+}
+@font-face {
+  font-family: TestStyle;
+  src: url(resources/csstest-weights-100-kerned.ttf);
+  font-style: oblique 20deg 30deg;
+}
+@font-face {
+  font-family: TestStyle;
+  src: url(resources/csstest-weights-900-kerned.ttf);
+  font-style: oblique 30deg 40deg;
+}
+@font-face {
+  font-family: TestStretch;
+  src: url(resources/csstest-weights-100-kerned.ttf);
+  font-stretch: 110% 120%;
+}
+@font-face {
+  font-family: TestStretch;
+  src: url(resources/csstest-weights-900-kerned.ttf);
+  font-stretch: 120% 130%;
+}
+</style>
+
+<p style="font-family: TestWeight; font-weight: 250;">A</p>
+<p style="font-family: TestStyle; font-style: oblique 25deg;">A</p>
+<p style="font-family: TestStretch; font-stretch: 115%;">A</p>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed.html b/testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed.html
new file mode 100644
index 0000000000..14d426245d
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-descriptor-range-reversed.html
@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<title>CSS Test: Matching @font-face font-weight, font-style, and font-stretch descriptors with reversed ranges</title>
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-prop-desc">
+<link rel="match" href="font-descriptor-range-reversed-ref.html">
+
+<!-- Using csstest-weights-{100,900}-kerned.ttf just as two convenient
+     different fonts here with different "A" glyphs -->
+
+<style>
+@font-face {
+  font-family: TestWeight;
+  src: url(resources/csstest-weights-100-kerned.ttf);
+  font-weight: 300 200;
+}
+@font-face {
+  font-family: TestWeight;
+  src: url(resources/csstest-weights-900-kerned.ttf);
+  font-weight: 300 400;
+}
+@font-face {
+  font-family: TestStyle;
+  src: url(resources/csstest-weights-100-kerned.ttf);
+  font-style: oblique 30deg 20deg;
+}
+@font-face {
+  font-family: TestStyle;
+  src: url(resources/csstest-weights-900-kerned.ttf);
+  font-style: oblique 30deg 40deg;
+}
+@font-face {
+  font-family: TestStretch;
+  src: url(resources/csstest-weights-100-kerned.ttf);
+  font-stretch: 120% 110%;
+}
+@font-face {
+  font-family: TestStretch;
+  src: url(resources/csstest-weights-900-kerned.ttf);
+  font-stretch: 120% 130%;
+}
+</style>
+
+<!-- Matches `font-weight: 300 200;` -->
+<p style="font-family: TestWeight; font-weight: 250;">A</p>
+
+<!-- Matches `font-style: oblique 30deg 20deg;` -->
+<p style="font-family: TestStyle; font-style: oblique 25deg;">A</p>
+
+<!-- Matches `font-style: oblique 120% 110%;` -->
+<p style="font-family: TestStretch; font-stretch: 115%;">A</p>
+
+<script>
+document.fonts.ready.then(function() {
+  document.documentElement.className = "";
+});
+</script>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-opentype-collections.html b/testing/web-platform/tests/css/css-fonts/variations/font-opentype-collections.html
new file mode 100644
index 0000000000..1b403b3246
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-opentype-collections.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing support for OpenType collections in @font-face rules</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#src-desc" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+      @font-face {
+          font-family: OpenType;
+          src: url(/fonts/Ahem.ttf);
+      }
+
+      @font-face {
+          font-family: OpenType-Collection;
+          src: url(./resources/ahem.ttc);
+        }
+    </style>
+</head>
+<body onload="test()">
+    <div id="opentype" style="display:inline-block; font-family:OpenType,Georgia;">Test</div><br>
+    <div id="collection" style="display:inline-block; font-family:OpenType-Collection,Verdana;">Test</div>
+    <script>
+
+        var opentypeElement = document.getElementById("opentype");
+        var collectionElement = document.getElementById("collection");
+
+        var loadTest = async_test("Verify that collection font is loaded");
+
+        function test() {
+            if (opentypeElement.offsetWidth == collectionElement.offsetWidth) {
+                loadTest.done();
+            }
+            else {
+                window.requestAnimationFrame(test);
+            }
+        }
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-parse-numeric-stretch-style-weight.html b/testing/web-platform/tests/css/css-fonts/variations/font-parse-numeric-stretch-style-weight.html
new file mode 100644
index 0000000000..19c0ded19e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-parse-numeric-stretch-style-weight.html
@@ -0,0 +1,146 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<script>
+setup({explicit_done : true});
+
+var styleValidTests = {
+  'weight': [
+    'bold',
+    '700',
+    '900',
+    '850',
+    '850.3',
+    'calc(100 + 300)',
+    'calc(0.2 + 205.5)',
+    'calc(0 - 100)',
+    'calc(200 + 801)',
+  ],
+  'stretch': ['51%', '199%', 'calc(10% + 20%)', '0%'],
+  'style' : [ 'normal', 'italic', 'oblique', 'oblique 50deg', 'oblique -90deg', 'oblique 90deg',
+              'oblique calc(90deg + 20deg)', 'oblique calc(30deg + 20deg)' ]
+};
+
+var styleInvalidTests = {
+  'weight': ['100 400'],
+  'stretch': ['100% 110%', '100% 150%', 'calc(1 + 10%)'],
+  'style' : [ 'normal 10deg', 'italic 10deg', 'oblique -91deg', 'oblique 91deg' ]
+};
+
+function testParseStyle() {
+  for (validStyleTestCategory of Object.keys(styleValidTests)) {
+    for (validStyleTest of styleValidTests[validStyleTestCategory]) {
+      test(
+          function() {
+            assert_true(
+                CSS.supports('font-' + validStyleTestCategory, validStyleTest));
+          },
+          'Valid value ' + validStyleTest + ' for font property ' +
+              validStyleTestCategory + ' used for styling.')
+    }
+  }
+  for (invalidStyleTestCategory of Object.keys(styleInvalidTests)) {
+    for (invalidStyleTest of styleInvalidTests[invalidStyleTestCategory]) {
+      test(
+          function() {
+            assert_false(CSS.supports(
+                'font-' + invalidStyleTestCategory, invalidStyleTest));
+          },
+          'Invalid value ' + invalidStyleTest + ' for font property ' +
+              invalidStyleTestCategory + ' used for styling.')
+    }
+  }
+}
+
+var faceTests = {
+  'weight': [
+    ['100', '100'], ['700', '700'], ['900', '900'], ['bold', 'bold'],
+    ['normal', 'normal'], ['100 400', '100 400'], ['100 101.5', '100 101.5'],
+    ['999.8 999.9', '999.8 999.9'],
+    [ '500 400', '500 400']
+  ],
+  'stretch': [
+    ['0%', '0%'],
+    ['calc(0% - 10%)', 'calc(-10%)' ],
+    ['100%', '100%'],
+    ['110%', '110%'],
+    ['111.5%', '111.5%'],
+    [ "50% 200%", "50% 200%" ],
+    [ "0.1% 1%", "0.1% 1%" ],
+    [ "900% 901%", "900% 901%" ],
+    ['ultra-condensed', 'ultra-condensed'],
+    ['ultra-expanded', 'ultra-expanded'],
+  ],
+  'style' : [
+    [ "normal", "normal" ],
+    [ "italic", "italic" ],
+    [ "oblique", "oblique" ],
+    [ "oblique 10deg", "oblique 10deg" ],
+    [ "oblique 10deg 20deg", "oblique 10deg 20deg" ]
+  ]
+};
+
+var faceInvalidTests = {
+  'weight': [
+    '0',
+    '0.9',
+    '-100 200',
+    '100 -200',
+    '100 1001',
+    '1001',
+    '1000.5',
+    '100 200 300',
+    'a',
+    'a b c',
+  ],
+  'stretch': [
+    '-0.5%', '-1%', '60% 70% 80%', 'a%', 'a b c', '0.1',
+    '-60% 80%', 'ultra-expannnned', '50% 0'
+  ],
+  'style' : [ 'oblique 100deg', 'oblique italic', 'oblique -91deg', 'oblique 0',
+              'oblique 10', 'iiitalic', '90deg', '11', 'italic 90deg' ]
+};
+
+function testParseFace() {
+  for (var theProperty of Object.keys(faceTests)) {
+    for (var faceTest of faceTests[theProperty]) {
+      test(
+          () => {
+            var fontFace = new FontFace('testfont', 'url()');
+            assert_equals(fontFace[theProperty], 'normal');
+            fontFace[theProperty] = faceTest[0];
+            assert_equals(fontFace[theProperty], faceTest[1]);
+          },
+          'Valid value ' + faceTest[0] + ' matches ' + faceTest[1] + ' for ' +
+              theProperty + ' in @font-face.');
+    }
+  }
+
+  for (var theProperty of Object.keys(faceInvalidTests)) {
+    for (var faceTest of faceInvalidTests[theProperty]) {
+      test(
+          () => {
+            var fontFace = new FontFace('testfont', 'url()');
+            assert_throws_dom('SyntaxError', () => {
+              fontFace[theProperty] = faceTest;
+            }, 'Value must not be accepted as weight value.');
+          },
+          'Value ' + faceTest + ' must not be accepted as ' + theProperty +
+              ' in @font-face.')
+    }
+  }
+}
+
+window.addEventListener('load', function() {
+  testParseStyle();
+  testParseFace();
+  done();
+});
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-shorthand.html b/testing/web-platform/tests/css/css-fonts/variations/font-shorthand.html
new file mode 100644
index 0000000000..c0f1f54196
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-shorthand.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing font shorthand for new values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="shorthand-test">Shorthand test</div>
+
+    <script>
+
+        testFontShorthand = [
+            { value: "calc(24px) Arial",                                    isValid:true,   message: "Font size specified as calc()" },
+
+            // font-weight as number
+            { value: "700.5 24px Arial",                                    isValid:true,   expectedWeight:"700.5", message: "Font weight specified as number" },
+            { value: "0.9 24px Arial",                                      isValid:false,  message: "Font weight specified as number, value less than 1" },
+            { value: "1700.5 24px Arial",                                   isValid:false,  message: "Font weight specified as number, value greater than 1000" },
+
+            // font-weight as calc()
+            { value: "calc(900.7 - 200.1 * 2) calc(12px + 12px) Arial",     isValid:true,   expectedWeight:"500.5", message: "Font weight specified as calc()" },
+            { value: "calc(400.5 - 200.1 * 2) 24px Arial",                  isValid:true,   expectedWeight:"1",     message: "Font weight specified as calc(), value smaller than 1" },
+            { value: "calc(400.5 + 300.1 * 2) 24px Arial",                  isValid:true,   expectedWeight:"1000",  message: "Font weight specified as calc(), value greater than 1000" },
+
+            // font-style
+            { value: "oblique 45deg 24px Arial",                            isValid:true,   expectedStyle: "oblique 45deg",  message: "'oblique' with positive angle" },
+            { value: "oblique -45deg 24px Arial",                           isValid:true,   expectedStyle: "oblique -45deg", message: "'oblique' with negative angle" },
+            { value: "oblique 24px Arial",                                  isValid:true,   expectedStyle: "oblique",        message: "'oblique' without slant angle" },
+            { value: "oblique 100deg 24px Arial",                           isValid:false,                                   message: "'oblique' with positive angle, value out of range" },
+            { value: "oblique -100deg 24px Arial",                          isValid:false,                                   message: "'oblique' with negative angle, value out of range" },
+
+            // font-weight and font-style combined
+            { value: "oblique 50 24px Arial",                               isValid:true,   expectedStyle: "oblique",        expectedWeight:"50",    message: "'oblique' followed by valid small weight" },
+            { value: "oblique 500 24px Arial",                              isValid:true,   expectedStyle: "oblique",        expectedWeight:"500",   message: "'oblique' followed by valid large weight" },
+            { value: "oblique 45deg 500 24px Arial",                        isValid:true,   expectedStyle: "oblique 45deg",  expectedWeight:"500",   message: "'oblique' with positive angle followed by valid weight" },
+            { value: "oblique -45deg 500 24px Arial",                       isValid:true,   expectedStyle: "oblique -45deg", expectedWeight:"500",   message: "'oblique' with negative angle followed by valid weight" },
+
+            // font-weight and font-style combined, with calc()
+            { value: "oblique calc(200 + 300) 24px Arial",                  isValid:true,  expectedStyle: "oblique",         expectedWeight:"500",   message: "'oblique' followed by valid calc() weight" },
+            { value: "oblique 30deg calc(200 + 300) 24px Arial",            isValid:true,  expectedStyle: "oblique 30deg",   expectedWeight:"500",   message: "'oblique' with angle followed by valid calc() weight" },
+            { value: "oblique calc(900 + 300) 24px Arial",                  isValid:true,  expectedStyle: "oblique",         expectedWeight:"1000",  message: "'oblique' followed by a to-be-clamped calc() weight" },
+            { value: "calc(200 + 300) oblique 24px Arial",                  isValid:true,  expectedStyle: "oblique",         expectedWeight:"500",   message: "calc() weight folowed by 'oblique'" },
+            { value: "calc(200 + 300) oblique 45deg 24px Arial",            isValid:true,  expectedStyle: "oblique 45deg",   expectedWeight:"500",   message: "calc() weight folowed by 'oblique' and slant angle" },
+            { value: "calc(900 + 300) oblique 45deg 24px Arial",            isValid:true,  expectedStyle: "oblique 45deg",   expectedWeight:"1000",  message: "To-be-clamped calc() weight folowed by 'oblique' and slant angle" },
+        ];
+
+        testFontShorthand.forEach(function (testCase) {
+            test(() => {
+                assert_equals(window.CSS.supports("font", testCase.value), testCase.isValid, "Font shorthand: " + testCase.message);
+
+                let expectedStyle  = (testCase.expectedStyle) ? testCase.expectedStyle : "normal";
+                let expectedWeight = (testCase.expectedWeight) ? testCase.expectedWeight : "400";
+                let expectedSize = (testCase.isValid) ? "24px" : "16px";
+
+                var testElement = document.getElementById("shorthand-test");
+                testElement.setAttribute("style", "font:" + testCase.value);
+                var style = window.getComputedStyle(testElement);
+                assert_equals(style.fontStyle, expectedStyle, "Font shorthand expected style: " + testCase.message);
+                assert_equals(style.fontWeight, expectedWeight, "Font shorthand expected weight: " + testCase.message);
+                assert_equals(style.fontSize, expectedSize, "Font shorthand expected size: " + testCase.message);
+            }, "Font shorthand: " + testCase.message);
+
+        });
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-1-ref.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-1-ref.html
new file mode 100644
index 0000000000..7b819bfa56
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-1-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS reference file: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<style>
+@font-face {
+  font-family: test;
+  font-style: oblique 10deg;
+  src: url(resources/Inter.var.subset.ttf);
+}
+.test {
+  font: 32px/1.5 test;
+  font-variation-settings: 'slnt' -10;
+}
+</style>
+<body>
+<p>Test passes if all the following lines are displayed with a 10-degree rightward slant.</p>
+<div class="test">slant</div>
+<div class="test">slant</div>
+<div class="test">slant</div>
+<div class="test">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-1.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-1.html
new file mode 100644
index 0000000000..f3985defde
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-1.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS test: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts/#valdef-font-style-oblique-angle"/>
+<link rel="match" href="font-slant-1-ref.html"/>
+<style>
+@font-face {
+  font-family: test;
+  font-style: oblique 0deg 10deg;
+  src: url(resources/Inter.var.subset.ttf);
+}
+.test {
+  font-synthesis: none;
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if all the following lines are displayed with a 10-degree rightward slant.</p>
+<div class="test" style="font-variation-settings: 'slnt' -10">slant</div>
+<div class="test" style="font-style: oblique">slant</div>
+<div class="test" style="font-style: oblique 10deg">slant</div>
+<div class="test" style="font-style: italic">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-2-ref.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2-ref.html
new file mode 100644
index 0000000000..4f109aa219
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2-ref.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS reference file: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<style>
+@font-face {
+  font-family: test;
+  src: url(resources/Inter.var.subset.ttf);
+}
+.test {
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if none of the following lines are displayed with a slanted font.</p>
+<div class="test">slant</div>
+<div class="test">slant</div>
+<div class="test">slant</div>
+<div class="test">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-2a.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2a.html
new file mode 100644
index 0000000000..386ff83f8d
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2a.html
@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS test: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts/#valdef-font-style-oblique-angle"/>
+<link rel="match" href="font-slant-2-ref.html"/>
+<style>
+@font-face {
+  font-family: test;
+  font-style: oblique 0deg 10deg;
+  src: url(resources/Inter.var.subset.ttf);
+}
+.test {
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if none of the following lines are displayed with a slanted font.</p>
+<div class="test">slant</div>
+<div class="test" style="font-variation-settings: 'slnt' 10">slant</div>
+<div class="test" style="font-style: oblique 0deg">slant</div>
+<div class="test" style="font-style: oblique -10deg">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-2b.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2b.html
new file mode 100644
index 0000000000..0fb280827e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2b.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS test: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts/#valdef-font-style-oblique-angle"/>
+<link rel="match" href="font-slant-2-ref.html"/>
+<style>
+@font-face {
+  font-family: test;
+  font-style: oblique -10deg 0deg;
+  src: url(resources/Inter.var.subset.ttf);
+}
+.test {
+  font-synthesis: none;
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if none of the following lines are displayed with a slanted font.</p>
+<div class="test">slant</div>
+<div class="test" style="font-variation-settings: 'slnt' 10">slant</div>
+<div class="test" style="font-style: oblique">slant</div>
+<div class="test" style="font-style: italic">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-2c.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2c.html
new file mode 100644
index 0000000000..5436fc1b67
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-2c.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS test: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts/#valdef-font-style-oblique-angle"/>
+<link rel="match" href="font-slant-2-ref.html"/>
+<style>
+@font-face {
+  font-family: test;
+  font-style: normal;
+  src: url(resources/Inter.var.subset.ttf);
+}
+.test {
+  font-synthesis: none;
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if none of the following lines are displayed with a slanted font.</p>
+<div class="test" style="font-style: oblique">slant</div>
+<div class="test" style="font-style: oblique 10deg">slant</div>
+<div class="test" style="font-style: oblique -10deg">slant</div>
+<div class="test" style="font-style: italic">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-3-ref.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-3-ref.html
new file mode 100644
index 0000000000..542479db51
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-3-ref.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS reference file: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<style>
+@font-face {
+  font-family: test;
+  /* Version of Inter subset with OpenType tables stripped,
+     so the browser's synthetic styling should take effect. */
+  src: url(resources/Inter.no-var.subset.ttf);
+  font-style: normal;
+  font-weight: normal;
+  font-stretch: normal;
+}
+.test {
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if the following lines are displayed with a variety of synthetic slants.</p>
+<div class="test" style="font-style: oblique 10deg">slant</div>
+<div class="test" style="font-style: oblique 20deg">slant</div>
+<div class="test" style="font-style: oblique -10deg">slant</div>
+<div class="test" style="font-style: oblique 14deg">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-slant-3.html b/testing/web-platform/tests/css/css-fonts/variations/font-slant-3.html
new file mode 100644
index 0000000000..047409ec35
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-slant-3.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS test: mapping of font-style:oblique to opentype 'slnt' axis</title>
+<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts/#valdef-font-style-oblique-angle"/>
+<link rel="match" href="font-slant-3-ref.html"/>
+<style>
+@font-face {
+  font-family: test;
+  /* The font resource includes a 'slnt' axis, but our font-style descriptor
+     should prevent it being used to render oblique/italic styles. */
+  src: url(resources/Inter.var.subset.ttf);
+  font-style: normal;
+  font-weight: normal;
+  font-stretch: normal;
+}
+.test {
+  font-synthesis: style;
+  font: 32px/1.5 test;
+}
+</style>
+<body>
+<p>Test passes if the following lines are displayed with a variety of synthetic slants.</p>
+<div class="test" style="font-style: oblique 10deg">slant</div>
+<div class="test" style="font-style: oblique 20deg">slant</div>
+<div class="test" style="font-style: oblique -10deg">slant</div>
+<div class="test" style="font-style: italic">slant</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-stretch.html b/testing/web-platform/tests/css/css-fonts/variations/font-stretch.html
new file mode 100644
index 0000000000..a27b251f48
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-stretch.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing new font-stretch values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-stretch-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="computedStyleTest">Abc</span></div>
+    <div id="inheritanceTest"><span style="font-stretch:125%;">Abc</span><span style="font-stretch:expanded;">Abc</span><span style="font-weight: 700;">Abc</span></div>
+    <script>
+
+        testStretchValues = [
+            { stretch: "100",               expectedComputedStretch: "100%" ,   expectedIsSupported: false, message: "only percentages, not numbers allowed" },
+            { stretch: "-1%",               expectedComputedStretch: ""  ,      expectedIsSupported: false, message: "negative values are illegal" },
+            { stretch: "0%",                expectedComputedStretch: "0%",      expectedIsSupported: true,  message: "zero is legal" },
+            { stretch: "1%",                expectedComputedStretch: "1%",      expectedIsSupported: true,  message: "legal percentage" },
+            { stretch: "10%",               expectedComputedStretch: "10%",     expectedIsSupported: true,  message: "legal percentage" },
+            { stretch: "100%",              expectedComputedStretch: "100%",    expectedIsSupported: true,  message: "legal percentage" },
+            { stretch: "1000%",             expectedComputedStretch: "1000%",   expectedIsSupported: true,  message: "legal percentage" },
+            { stretch: "1e9%",              expectedComputedStretch: "1e+009%", expectedIsSupported: true,  message: "huge legal percentage" },
+            { stretch: "ultra-condensed",   expectedComputedStretch: "50%",     expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "extra-condensed",   expectedComputedStretch: "62.5%",   expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "condensed",         expectedComputedStretch: "75%",     expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "semi-condensed",    expectedComputedStretch: "87.5%",   expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "normal",            expectedComputedStretch: "100%",    expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "semi-expanded",     expectedComputedStretch: "112.5%",  expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "expanded",          expectedComputedStretch: "125%",    expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "extra-expanded",    expectedComputedStretch: "150%",    expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "ultra-expanded",    expectedComputedStretch: "200%",    expectedIsSupported: true,  message: "legal enum" },
+            { stretch: "narrower",          expectedComputedStretch: "",        expectedIsSupported: false, message: "deprecated" },
+            { stretch: "wider",             expectedComputedStretch: "",        expectedIsSupported: false, message: "deprecated" },
+            { stretch: "calc(200.5%)",      expectedComputedStretch: "200.5%",  expectedIsSupported: true,  message: "Simple calc value" },
+            { stretch: "calc(50%*2 - 20%)", expectedComputedStretch: "80%",     expectedIsSupported: true,  message: "Valid calc expression" },
+            { stretch: "calc(-100%)",       expectedComputedStretch: "0%",      expectedIsSupported: true,  message: "Negative calc value (to be clamped)" },
+            { stretch: "calc(50% - 50%*2)", expectedComputedStretch: "0%",      expectedIsSupported: true,  message: "Negative calc expression (to be clamped)" },
+            { stretch: "calc(100)",         expectedComputedStretch: "",        expectedIsSupported: false, message: "Unit-less calc value" },
+            { stretch: "calc(100px)",       expectedComputedStretch: "",        expectedIsSupported: false, message: "Calc value with units" },
+            { stretch: "100% 700%",         expectedComputedStretch: "",        expectedIsSupported: false, message: "Extra percentage after numeric value" },
+            { stretch: "100% 100",          expectedComputedStretch: "",        expectedIsSupported: false, message: "Extra content after numeric value" },
+            { stretch: "condensed expanded",expectedComputedStretch: "",        expectedIsSupported: false, message: "Extra content after keyword value" },
+            { stretch: "calc(100%) 100%",   expectedComputedStretch: "",        expectedIsSupported: false, message: "Extra content after calc value" }
+        ];
+
+        testStretchValues.forEach(function (element) {
+            test(() => { assert_equals(window.CSS.supports("font-stretch", element.stretch), element.expectedIsSupported, element.message); }, "@supports: " + element.stretch + " - " + element.message);
+
+            // If supported, verify the computed style.
+            if (element.expectedIsSupported)
+            {
+                var testSpan = document.getElementById("computedStyleTest");
+                testSpan.style.fontStretch = element.stretch;
+                var actualStretch = window.getComputedStyle(testSpan).fontStretch;
+
+                test(() => { assert_equals(actualStretch, element.expectedComputedStretch, element.message); }, "@getComputedStyle: " + element.stretch + " - " + element.message);
+            }
+        });
+
+        // Verify computed inheritance of nested elements.
+        {
+            var base = document.getElementById("inheritanceTest");
+            var parentStretch = "condensed";
+            base.style.fontStretch = parentStretch;
+
+            test(() => {
+                var actualStretch = window.getComputedStyle(base.children[0]).fontStretch;
+                assert_equals(actualStretch, "125%", "Overridden value for " + parentStretch + " should match expected value.");
+            }, "Test font-stretch for overridden number " + parentStretch);
+
+            test(() => {
+                var actualStretch = window.getComputedStyle(base.children[1]).fontStretch;
+                assert_equals(actualStretch, "125%", "Inherited value " + parentStretch + " should match expected value.");
+            }, "Test font-stretch for overridden enum name resolved to number " + parentStretch);
+
+            test(() => {
+                var actualStretch = window.getComputedStyle(base.children[2]).fontStretch;
+                assert_equals(actualStretch, "75%", "Inherited value " + parentStretch + " should match expected value.");
+            }, "Test font-stretch for inherited named enum resolved to number " + parentStretch);
+        }
+
+   </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-style-interpolation.html b/testing/web-platform/tests/css/css-fonts/variations/font-style-interpolation.html
new file mode 100644
index 0000000000..0fb8850c4a
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-style-interpolation.html
@@ -0,0 +1,89 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing the interpolation of new font-style values introduced in CSS Fonts level 4</title>
+    <meta name="timeout" content="long">
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-style-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+        @keyframes fontStyleAnimation {
+            from { font-style: oblique -12deg; }
+            to   { font-style: oblique  12deg; }
+        }
+
+        #animation-test.animate {
+            animation: fontStyleAnimation 1s infinite alternate;
+        }
+
+        #transition-test {
+            font-style: oblique -12deg;
+            transition-property: font-style;
+            transition-duration: 10s;
+        }
+
+        #transition-test.animate {
+            font-style: oblique 12deg;
+        }
+
+    </style>
+</head>
+<body>
+    <div style="font-family: serif;">
+        <div id="animation-test">Animation test</div>
+        <div id="transition-test">Transition test</div>
+    </div>
+
+    <script>
+
+        async_test(function (test) {
+            var animationElement = document.getElementById("animation-test");
+
+            // Verify starting value
+            assert_equals(window.getComputedStyle(animationElement).fontStyle, "normal", "Font style before animation");
+
+            // Start animation
+            animationElement.classList.add("animate");
+
+            var waitForAnimationStep = test.step_func(function() {
+                var computedFontStyle = window.getComputedStyle(animationElement).fontStyle;
+                if (computedFontStyle != "normal" &&
+                    computedFontStyle != "oblique -12deg" &&
+                    computedFontStyle != "oblique 12deg") {
+                    test.done();
+                }
+                else {
+                    window.requestAnimationFrame(waitForAnimationStep);
+                }
+            });
+            waitForAnimationStep();
+
+        }, "font-style animation");
+
+        async_test(function (test) {
+            var transitionElement = document.getElementById("transition-test");
+
+            // Verify starting value
+            assert_equals(window.getComputedStyle(transitionElement).fontStyle, "oblique -12deg", "Font style before transition");
+
+            // Start transition
+            transitionElement.classList.add("animate");
+
+            var waitForTransitionStep = test.step_func(function() {
+                var computedFontStyle = window.getComputedStyle(transitionElement).fontStyle;
+                if (computedFontStyle != "normal" &&
+                    computedFontStyle != "oblique -12deg" &&
+                    computedFontStyle != "oblique 12deg") {
+                    test.done();
+                }
+                else {
+                    window.requestAnimationFrame(waitForTransitionStep);
+                }
+            });
+            waitForTransitionStep();
+
+        }, "font-style transition");
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-style-parsing.html b/testing/web-platform/tests/css/css-fonts/variations/font-style-parsing.html
new file mode 100644
index 0000000000..57384eaba3
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-style-parsing.html
@@ -0,0 +1,60 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing the new font-style values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-style-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="test"></div>
+    <script>
+        var testFontStyle = [
+            { style: "italic",                      expectedResult: true,   message: "'italic' is valid" },
+            { style: "italic 20deg",                expectedResult: false,  message: "'italic' followed by angle is invalid" },
+            { style: "italic a",                    expectedResult: false,  message: "'italic' followed by non-number is invalid" },
+            { style: "oblique",                     expectedResult: true,   message: "'oblique' is valid" },
+            { style: "oblique 0deg",                expectedResult: true,   message: "'oblique' followed by zero degrees is valid" },
+            { style: "oblique 20deg",               expectedResult: true,   message: "'oblique' followed by positive angle in degrees is valid" },
+            { style: "oblique 0.5rad",              expectedResult: true,   message: "'oblique' followed by positive angle in radians is valid",    expectedValue: "oblique 28.6479deg" },
+            { style: "oblique 20grad",              expectedResult: true,   message: "'oblique' followed by positive angle in gradians is valid",   expectedValue: "oblique 18deg" },
+            { style: "oblique 0.1turn",             expectedResult: true,   message: "'oblique' followed by positive angle in turns is valid",      expectedValue: "oblique 36deg" },
+            { style: "oblique 20px",                expectedResult: false,  message: "'oblique' followed by number with invalid unit type is in valid" },
+            { style: "oblique -20deg",              expectedResult: true,   message: "'oblique' followed by negative angle is valid" },
+            { style: "oblique 20.5deg",             expectedResult: true,   message: "'oblique' followed by fractional angle is valid" },
+            { style: "oblique 90deg",               expectedResult: true,   message: "'oblique' followed by maxumum 90 degree angle is valid" },
+            { style: "oblique -90deg",              expectedResult: true,   message: "'oblique' followed by minimum -90 degree angle is valid" },
+            { style: "oblique 90.01deg",            expectedResult: false,  message: "'oblique' followed by positive out of range angle is in invalid" },
+            { style: "oblique -90.01deg",           expectedResult: false,  message: "'oblique' followed by negative out of range angle is in invalid" },
+            { style: "oblique 10",                  expectedResult: false,  message: "'oblique' followed by unit-less value is invalid" },
+            { style: "oblique 30deg",               expectedResult: true,   message: "'oblique' followed by positive angle is valid" },
+            { style: "oblique a",                   expectedResult: false,  message: "'oblique' followed by non-number is invalid" },
+            { style: "oblique 20deg a",             expectedResult: false,  message: "'oblique' and angle followed by non-number is invalid" },
+            { style: "oblique -",                   expectedResult: false,  message: "'oblique' followed by isolated minus is invalid" },
+            { style: "oblique - 20deg",             expectedResult: false,  message: "'oblique' followed by minus and angle separated by space is invalid" },
+            { style: "oblique -a",                  expectedResult: false,  message: "'oblique' followed by minus and non-number is invalid" },
+            { style: "oblique calc(50deg)",         expectedResult: true,   message: "'oblique' followed by calc is valid",                         expectedValue: "oblique 50deg" },
+            { style: "oblique calc(-120deg)",       expectedResult: true,   message: "'oblique' followed by calc is valid even if it must be clamped (no computation)",     expectedValue: "oblique -90deg" },
+            { style: "oblique calc(6 * 20deg)",     expectedResult: true,   message: "'oblique' followed by calc is valid even if it must be clamped (with computation)",   expectedValue: "oblique 90deg" },
+            { style: "oblique calc(10grad + 5deg)", expectedResult: true,   message: "'oblique' followed by calc is valid even if it mixes units (with computation)",       expectedValue: "oblique" }
+        ];
+
+        testFontStyle.forEach(function (testCase) {
+            test(() => {
+                assert_equals(window.CSS.supports("font-style", testCase.style), testCase.expectedResult, "Font-style supports: " + testCase.message);
+            }, "Font-style (supports): " + testCase.message);
+        });
+
+        testFontStyle.forEach(function (testCase) {
+            if (testCase.expectedResult) {
+                test(() => {
+                    let element = document.getElementById("test");
+                    element.style = "font-style: " + testCase.style;
+                    let expectedValue = (testCase.expectedValue) ? testCase.expectedValue : testCase.style;
+                    assert_equals(window.getComputedStyle(element).fontStyle, expectedValue, "Font-style computed style: " + testCase.message);
+                }, "Font-style (computed): " + testCase.message);
+            }
+        });
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-variation-settings-inherit.html b/testing/web-platform/tests/css/css-fonts/variations/font-variation-settings-inherit.html
new file mode 100644
index 0000000000..f0d8f0b2a5
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-variation-settings-inherit.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing the inheritance of the font-variation-settings property</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#propdef-font-variation-settings" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+    <div id="inheritanceTestParent" style="font-variation-settings: 'xxxx' 1, 'xxxx' 2;">
+        <span id="inheritanceTestChildInherited">Abc</span>
+        <span id="inheritanceTestChildOverride" style="font-variation-settings: 'cccc' 1, 'bbbb' 2, 'aaaa' 3, 'aaaa' calc(2 + 2);">Abc</span>
+    </div>
+    <script>
+
+        // Verify computed inheritance of nested elements.
+        var elementParent = document.getElementById("inheritanceTestParent");
+        var elementChildInherited = document.getElementById("inheritanceTestChildInherited");
+        var elementChildOverride = document.getElementById("inheritanceTestChildOverride");
+
+        var parentValue = "'yyyy' 1, 'yyyy' 2";
+        elementParent.style.fontVariationSettings = parentValue;
+
+        test(() => {
+            var actualValue = window.getComputedStyle(elementParent).fontVariationSettings;
+            // The following strict test is subject to debate; softening for now:
+            // assert_equals(actualValue, "\"yyyy\" 2", "Duplicate axis tags should be removed, favoring the latter axis tag's value.");
+            assert_equals((/.*(?:"|')yyyy(?:"|') (\d)/.exec(actualValue)||[])[1], '2', "Child should override parent value.");
+        }, "Test font-variation-settings for duplicates using " + parentValue);
+
+        test(() => {
+            var actualValue = window.getComputedStyle(elementChildInherited).fontVariationSettings;
+            // The following strict test is subject to debate; softening for now:
+            // assert_equals(actualValue, "\"yyyy\" 2", "Child should inherit the parent value directly.");
+            assert_equals((/.*(?:"|')yyyy(?:"|') (\d)/.exec(actualValue)||[])[1], '2', "Child should override parent value.");
+        }, "Test font-variation-settings for child inheritance");
+
+        test(() => {
+            var actualValue = window.getComputedStyle(elementChildOverride).fontVariationSettings;
+            // The following strict test is subject to debate; softening for now:
+            // assert_equals(actualValue, "\"aaaa\" 4, \"bbbb\" 2, \"cccc\" 1", "Child should override parent value.");
+            assert_equals((/.*(?:"|')aaaa(?:"|') (\d)/.exec(actualValue)||[])[1], '4', "Child should override parent value.");
+            assert_equals((/.*(?:"|')yyyy(?:"|') (\d)/.exec(actualValue)||[])[1], undefined, "Child should override parent value.");
+        }, "Test font-variation-settings for child override");
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-interpolation.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-interpolation.html
new file mode 100644
index 0000000000..745be060ab
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-interpolation.html
@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing the interpolation of new font-weight values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-weight-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+        @keyframes fontWeightAnimation {
+            from { font-weight: 100; }
+            to   { font-weight: 900; }
+        }
+
+        #animation-test.animate {
+            animation: fontWeightAnimation 1s infinite alternate;
+        }
+
+        #transition-test {
+            font-weight: 100;
+            transition-property: font-weight;
+            transition-duration: 10s;
+        }
+
+        #transition-test.animate {
+            font-weight: 900;
+        }
+
+    </style>
+</head>
+<body>
+    <div style="font-family: 'CSSTest Weights Full';">
+        <div id="animation-test">A</div>
+        <div id="transition-test">A</div>
+    </div>
+
+    <script>
+
+        async_test(function (test) {
+            var animationElement = document.getElementById("animation-test");
+
+            // Verify starting value
+            assert_equals(window.getComputedStyle(animationElement).fontWeight, "400", "Font weight before animation");
+
+            // Start animation
+            animationElement.classList.add("animate");
+
+            var waitForAnimationStep = test.step_func(function() {
+                var computedFontWeight = window.getComputedStyle(animationElement).fontWeight;
+                if (computedFontWeight[1] != "0" || computedFontWeight[2] != 0) { // the value should eventually not be a multiple of 100
+                    test.done();
+                }
+                else {
+                    window.requestAnimationFrame(waitForAnimationStep);
+                }
+            });
+            waitForAnimationStep();
+
+        }, "font-weight animation");
+
+        async_test(function (test) {
+            var transitionElement = document.getElementById("transition-test");
+
+            // Verify starting value
+            assert_equals(window.getComputedStyle(transitionElement).fontWeight, "100", "Font weight before transition");
+
+            // Start transition
+            transitionElement.classList.add("animate");
+
+            var waitForTransitionStep = test.step_func(function() {
+                var computedFontWeight = window.getComputedStyle(transitionElement).fontWeight;
+                if (computedFontWeight[1] != "0" || computedFontWeight[2] != 0) { // the value should eventually not be a multiple of 100
+                    test.done();
+                }
+                else {
+                    window.requestAnimationFrame(waitForTransitionStep);
+                }
+            });
+            waitForTransitionStep();
+
+        }, "font-weight transition");
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-lighter-bolder.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-lighter-bolder.html
new file mode 100644
index 0000000000..68321c5075
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-lighter-bolder.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing new font-weight lighter/bolder table introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-weight-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+
+    <div id="testcases">
+        <div class="testcase" style="font-family: 'CSSTest Weights Full';">
+            <span style="font-weight:lighter;color:red;">A</span>A<span style="font-weight:bolder;color:red;">A</span>
+            <span style="font: menu; font-size: 10px;">(default)</span>
+        </div>
+    </div>
+
+    <script>
+
+        testRelativeWeights = [
+            { baseWeight: 99,   lighter: "99",  bolder: "400" },
+            { baseWeight: 100,  lighter: "100", bolder: "400" },
+            { baseWeight: 349,  lighter: "100", bolder: "400" },
+            { baseWeight: 350,  lighter: "100", bolder: "700" },
+            { baseWeight: 549,  lighter: "100", bolder: "700" },
+            { baseWeight: 550,  lighter: "400", bolder: "900" },
+            { baseWeight: 749,  lighter: "400", bolder: "900" },
+            { baseWeight: 750,  lighter: "700", bolder: "900" },
+            { baseWeight: 899,  lighter: "700", bolder: "900" },
+            { baseWeight: 900,  lighter: "700", bolder: "900" },
+            { baseWeight: 901,  lighter: "700", bolder: "901" },
+        ];
+
+        var testcases = document.getElementById("testcases");
+        var testcase_template = testcases.firstElementChild; testcases.removeChild(testcase_template);
+        testRelativeWeights.forEach(function(element) {
+
+            var base = testcase_template.cloneNode(true);
+            base.children[2].textContent = element.baseWeight;
+            base.style.fontWeight = element.baseWeight;
+            testcases.appendChild(base);
+
+            test(() => {
+                var actualLighter = window.getComputedStyle(base.children[0]).fontWeight;
+                assert_equals(actualLighter, element.lighter, "Lighter value for " + element.baseWeight + " should match expected value.");
+                base.children[0].style.color = 'green';
+            }, "Test lighter font-weight for base weight " + element.baseWeight);
+
+            test(() => {
+                var actualBolder = window.getComputedStyle(base.children[1]).fontWeight;
+                assert_equals(actualBolder, element.bolder, "Bolder value " + element.baseWeight + " should match expected value.");
+                base.children[1].style.color = 'green';
+            }, "Test bolder font-weight for base weight " + element.baseWeight);
+        });
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-matching-installed-fonts.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-matching-installed-fonts.html
new file mode 100644
index 0000000000..a290fb64fc
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-matching-installed-fonts.html
@@ -0,0 +1,114 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing new font-matching algorithm for font-weight values introduced in CSS Fonts level 4 (for system fonts)</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-matching-algorithm" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <!-- THIS TEST REQUIRES THAT YOU INSTALL THE [csstest-*.ttf] FONTS OF THE [resources] FOLDER -->
+    <style>
+
+        .testcase {
+            float:left;
+            margin: 5px;
+            font-size:48pt;
+            font-feature-settings: "kern" 1;
+            color: rgba(0,0,0,0.5);
+            background: linear-gradient(to left, lime 0%, lime 91px, red 91px);
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 900');
+            font-weight: 100;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 800');
+            font-weight: 250;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 700');
+            font-weight: 400;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 600');
+            font-weight: 450;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 300');
+            font-weight: 500;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 200');
+            font-weight: 750;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 100');
+            font-weight: 900;
+        }
+
+    </style>
+</head>
+<body>
+
+    <span style="position: absolute; top: -100vh;">
+        <span style="font-family: fontMatch; font-weight: 100;">A</span>
+        <span style="font-family: fontMatch; font-weight: 250;">A</span>
+        <span style="font-family: fontMatch; font-weight: 400;">A</span>
+        <span style="font-family: fontMatch; font-weight: 450;">A</span>
+        <span style="font-family: fontMatch; font-weight: 500;">A</span>
+        <span style="font-family: fontMatch; font-weight: 750;">A</span>
+        <span style="font-family: fontMatch; font-weight: 900;">A</span>
+    </span>
+
+    <div id="testcases" style="overflow: hidden">
+        <!--
+            These testcases work using the new kerned CSSTest Weights fonts.
+            The letter A and its corresponding numeric digit kern as one character.
+        -->
+        <div class="testcase" style="font-family:'CSSTest Weights W2569'; font-weight: 375;">
+            A2
+        </div>
+        <div class="testcase" style="font-family:'CSSTest Weights Full'; font-weight: 375;">
+            A3
+        </div>
+        <div class="testcase" style="font-family:'CSSTest Weights W1479'; font-weight: 475;">
+            A4
+        </div>
+        <div class="testcase" style="font-family:'CSSTest Weights Full'; font-weight: 425;">
+            A5
+        </div>
+        <div class="testcase" style="font-family:'CSSTest Weights Full'; font-weight: 525;">
+            A6
+        </div>
+        <div class="testcase" style="font-family:'CSSTest Weights Full'; font-weight: 675;">
+            A7
+        </div>
+        <br clear="all">
+    </div>
+
+    <script>
+
+        var base_testcases = document.querySelectorAll('.testcase');
+        for(var i = 0; i < base_testcases.length; i++) {
+            test(
+                assert => { assert_approx_equals(base_testcases[i].getBoundingClientRect().width, 90, 2, "@font-face should be mapped to " + base_testcases[i].style.fontFamily + "."); },
+                "Test native font matching on " + base_testcases[i].style.fontFamily + " for weight " + base_testcases[i].style.fontWeight
+            );
+        }
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-matching.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-matching.html
new file mode 100644
index 0000000000..5eb9a99f87
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-matching.html
@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing new font-matching algorithm for font-weight values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-matching-algorithm" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <style>
+
+        .testcase {
+            float:left;
+            margin: 5px;
+            font-size:48pt;
+            font-feature-settings: "kern" 1;
+            color: rgba(0,0,0,0.5);
+            background: linear-gradient(to left, lime 0%, lime 91px, red 91px);
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 900'), url('./resources/csstest-weights-900-kerned.ttf');
+            font-weight: 100;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 800'), url('./resources/csstest-weights-800-kerned.ttf');
+            font-weight: 250;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 700'), url('./resources/csstest-weights-700-kerned.ttf');
+            font-weight: 400;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 600'), url('./resources/csstest-weights-600-kerned.ttf');
+            font-weight: 450;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 300'), url('./resources/csstest-weights-300-kerned.ttf');
+            font-weight: 500;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 200'), url('./resources/csstest-weights-200-kerned.ttf');
+            font-weight: 750;
+        }
+
+        @font-face {
+            font-family: fontMatch;
+            src: local('CSSTest Weights 100'), url('./resources/csstest-weights-100-kerned.ttf');
+            font-weight: 900;
+        }
+
+    </style>
+</head>
+<body>
+
+    <span style="position: absolute; top: -100vh;">
+        <span style="font-family: fontMatch; font-weight: 100;">A</span>
+        <span style="font-family: fontMatch; font-weight: 250;">A</span>
+        <span style="font-family: fontMatch; font-weight: 400;">A</span>
+        <span style="font-family: fontMatch; font-weight: 450;">A</span>
+        <span style="font-family: fontMatch; font-weight: 500;">A</span>
+        <span style="font-family: fontMatch; font-weight: 750;">A</span>
+        <span style="font-family: fontMatch; font-weight: 900;">A</span>
+    </span>
+
+    <div id="testcases" style="overflow: hidden">
+        <!--
+            These testcases work using the new kerned CSSTest Weights fonts.
+            The letter A and its corresponding numeric digit kern as one character.
+        -->
+        <div class="testcase" style="font-family:'CSSTest Weights W2569'; font-weight: 375;">
+            A2
+        </div>
+    </div>
+
+    <script>
+
+        var testFontFaceMatch = [
+            { weight:  99, expectedFont: "CSSTest Weights 900" },
+            { weight: 100, expectedFont: "CSSTest Weights 900" },
+            { weight: 249, expectedFont: "CSSTest Weights 900" },
+            { weight: 250, expectedFont: "CSSTest Weights 800" },
+            { weight: 399, expectedFont: "CSSTest Weights 800" },
+            { weight: 400, expectedFont: "CSSTest Weights 700" },
+            { weight: 420, expectedFont: "CSSTest Weights 600" },
+            { weight: 470, expectedFont: "CSSTest Weights 300" },
+            { weight: 500, expectedFont: "CSSTest Weights 300" },
+            { weight: 600, expectedFont: "CSSTest Weights 200" },
+            { weight: 750, expectedFont: "CSSTest Weights 200" },
+            { weight: 751, expectedFont: "CSSTest Weights 100" },
+            { weight: 900, expectedFont: "CSSTest Weights 100" },
+            { weight:1000, expectedFont: "CSSTest Weights 100" },
+        ];
+
+        // wait for the fonts to load
+        // -- this should not be necessary if the fonts are installed as required
+        // -- but if they are not, the test is otherwise unstable
+        var once_fonts_are_ready = (document.fonts ? document.fonts.ready : new Promise(function(ready) { window.onload = time => [...document.querySelectorAll('body > span:nth-child(1) > span')].every(e => e.offsetWidth > 20) ? ready() : requestAnimationFrame(window.onload) }));
+
+        var testcases = document.querySelector("#testcases");
+        var testcaseTemplate = document.querySelector('.testcase'); testcaseTemplate.remove();
+        testFontFaceMatch.forEach(function(element) {
+
+            var testcase = testcaseTemplate.cloneNode(true);
+
+            // setup the test case style
+            testcase.style.fontFamily = 'fontMatch';
+            testcase.style.fontWeight = element.weight;
+
+            // create the assertion
+            var assertText = 'A' + /\d/.exec(element.expectedFont)[0];
+            testcase.textContent = assertText;
+
+            // append the testcase
+            testcases.appendChild(testcase);
+
+            // verify the testcase
+            promise_test(
+                assert => once_fonts_are_ready.then(assert => { assert_approx_equals(testcase.getBoundingClientRect().width, 90, 2, "@font-face should be mapped to " + element.expectedFont + "."); }),
+                "Test @font-face matching for weight " + element.weight
+            );
+        });
+
+    </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics-ref.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics-ref.html
new file mode 100644
index 0000000000..021586c154
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics-ref.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Fonts - reference</title>
+<link rel="author" title="Jonathan Kew" href="jkew@mozilla.com">
+<meta charset="utf-8">
+
+<style>
+@font-face {
+  font-family: test;
+  font-weight: 900;
+  src: url(resources/Inter.var.subset.ttf);
+}
+div {
+  font: 32px test;
+  position: absolute;
+  margin: 1em;
+}
+.heavy {
+  background: green;
+  color: green;
+  font-weight: 900;
+}
+</style>
+
+Test passes if there is a green rectangle and <strong>no red</strong>:
+
+<div class=heavy>
+aaaaaaaaaaaaaaaaaaaaaaaaaaaa
+</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics.html
new file mode 100644
index 0000000000..f10e591def
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-metrics.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<title>CSS Fonts - Test that variable-font glyph advances depend on applied weight</title>
+<link rel="author" title="Jonathan Kew" href="jkew@mozilla.com">
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-weight-prop"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-prop-desc"/>
+<link rel="match" href="font-weight-metrics-ref.html">
+<meta name="assert" content="Ensures that glyph advances are adjusted appropriately when the weight axis is varied."/>
+<meta charset="utf-8">
+
+<style>
+@font-face {
+  font-family: test;
+  font-weight: 100 900;
+  src: url(resources/Inter.var.subset.ttf);
+}
+div {
+  font: 32px test;
+  position: absolute;
+  margin: 1em;
+}
+.light {
+  background: red;
+  color: red;
+  font-weight: 100;
+}
+.heavy {
+  background: green;
+  color: green;
+  font-weight: 900;
+}
+</style>
+
+Test passes if there is a green rectangle and <strong>no red</strong>:
+
+<!-- Red background that should be entirely covered by the div with the heavy face -->
+<div class=light>
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+</div>
+
+<!-- The string here is two characters shorter, but the advance width of the heavy
+     glyphs should be large enough that the light div is still completely covered. -->
+<div class=heavy>
+aaaaaaaaaaaaaaaaaaaaaaaaaaaa
+</div>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/font-weight-parsing.html b/testing/web-platform/tests/css/css-fonts/variations/font-weight-parsing.html
new file mode 100644
index 0000000000..657616cd29
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/font-weight-parsing.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Testing the new font-weight values introduced in CSS Fonts level 4</title>
+    <link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-weight-prop" />
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+
+    <div id="computedStyleTest">A</div>
+
+    <script>
+
+        var testContinuousWeights = [
+            { weight: "401",      isValid: true,  message: "Values that are not multiple of 100 should be parsed successfully" },
+            { weight: "400.5",    isValid: true,  message: "Non-integer Values should be parsed successfully" },
+            { weight: "1",        isValid: true,  message: "Minimum allowed value should be parsed successfully" },
+            { weight: "0.999",    isValid: false, message: "Values below minimum should be rejected" },
+            { weight: "-100",     isValid: false, message: "Values below zero should be rejected" },
+            { weight: "1000",     isValid: true,  message: "Maximum allowed value should be parsed successfully" },
+            { weight: "1000.001", isValid: false, message: "Values above maximum should be rejected" },
+            { weight: "calc(100.5)", isValid: true, expectedWeight: "100.5", message: "Simple calc value" },
+            { weight: "calc(-100)", isValid: true, expectedWeight: "1", message: "Negative simple calc value (to be clamped)" },
+            { weight: "calc(1001)", isValid: true, expectedWeight: "1000", message: "Out-of-range simple calc value (to be clamped)" },
+            { weight: "calc(100.5*3 + 50.5)", isValid: true, expectedWeight: "352", message: "Valid calc expression" },
+            { weight: "calc(100.5*3 + 800)", isValid: true, expectedWeight: "1000", message: "Valid calc expression with out-of-range value (to be clamped)" },
+            { weight: "calc(100.5px + 50.5px)", isValid: false, message: "Valid calc expression with units" },
+            { weight: "400 700", isValid: false, message: "Extra number after numeric value" },
+            { weight: "400 10px", isValid: false, message: "Extra content after numeric value" },
+            { weight: "bold 400", isValid: false, message: "Extra content after keyword value" },
+            { weight: "calc(100.5) 400", isValid: false, message: "Extra content after calc value" }
+        ];
+
+        testContinuousWeights.forEach(function (element) {
+            test(() => { assert_equals(window.CSS.supports("font-weight", element.weight), element.isValid, element.message); }, "@supports: " + element.message);
+        });
+
+        testContinuousWeights.forEach(function (element) {
+            var testElement  = document.getElementById("computedStyleTest");
+
+            if (element.isValid) {
+                testElement.style.fontWeight = "300";
+                testElement.style.fontWeight = element.weight;
+                var expectedWeight = (element.expectedWeight) ? element.expectedWeight : element.weight;
+
+                test(() => { assert_equals(window.getComputedStyle(testElement).fontWeight, expectedWeight, element.message); }, "Computed style: " + element.message);
+            }
+        });
+
+    </script>
+</body>
+</html>
\ No newline at end of file
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diff --git a/testing/web-platform/tests/css/css-fonts/variations/resources/variabletest_box.ttf b/testing/web-platform/tests/css/css-fonts/variations/resources/variabletest_box.ttf
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diff --git a/testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable-ref.html b/testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable-ref.html
new file mode 100644
index 0000000000..bbb18ebbaf
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable-ref.html
@@ -0,0 +1,30 @@
+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8" />
+<title>CSS Test: Variable fonts with slant axis</title>
+<style>
+  @font-face {
+    font-family: "slnt test font";
+    src: url('resources/FontStyleTest-slnt_backslant-VF.woff2');
+    font-style: oblique -15deg 15deg;
+  }
+
+  .test {
+    font-family: "slnt test font";
+    font-size: 3em;
+  }
+
+  .slnt14 {
+    font-variation-settings: 'slnt' -14;
+  }
+
+  .backslant14 {
+    font-variation-settings: 'slnt' 14;
+  }
+
+</style>
+
+<p class="test backslant14">varfont</p>
+<p class="test slnt14">varfont</p>
+<p class="test slnt14">varfont</p>
+<p class="test">varfont</p>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable.html b/testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable.html
new file mode 100644
index 0000000000..4bbe2b157f
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/slnt-backslant-variable.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8" />
+<title>CSS Test: Variable fonts with slant axis</title>
+<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#descdef-font-face-font-variation-settings" />
+<link rel="help" href="http://w3c.github.io/csswg-drafts/css-fonts-4/#valdef-font-style-oblique-angle-90deg-90deg" />
+<link rel="match" href="slnt-backslant-variable-ref.html">
+<meta name="assert"
+  content="For variable fonts, setting font-style to oblique or italic should apply forward and backward slant to variable axis.">
+<!-- Fonts used in this test are authored by Stephen Nixon, more information in the link:
+https://arrowtype.github.io/vf-slnt-test/index.html -->
+<style>
+  @font-face {
+    font-family: "slnt test font";
+    src: url('resources/FontStyleTest-slnt_backslant-VF.woff2');
+    font-style: oblique -15deg 15deg;
+  }
+
+  .test {
+    font-family: "slnt test font";
+    font-size: 3em;
+  }
+
+  .backslant {
+    font-style: oblique -14deg;
+  }
+
+  .oblique {
+    font-style: oblique;
+  }
+
+  .italic {
+    font-style: italic;
+  }
+
+</style>
+
+<p class="test backslant">varfont</p>
+<p class="test oblique">varfont</p>
+<p class="test italic">varfont</p>
+<p class="test">varfont</p>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/slnt-variable-ref.html b/testing/web-platform/tests/css/css-fonts/variations/slnt-variable-ref.html
new file mode 100644
index 0000000000..75a237c6b2
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/slnt-variable-ref.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8" />
+<title>CSS Test: Variable fonts with slant axis</title>
+<style>
+  @font-face {
+    font-family: "slnt test font";
+    src: url('resources/FontStyleTest-slnt-VF.woff2');
+    font-style: oblique 0deg 15deg;
+  }
+
+  .test {
+    font-family: "slnt test font";
+    font-size: 3em;
+  }
+
+  .slnt14 {
+    font-variation-settings: 'slnt' -14;
+  }
+
+</style>
+
+<p class="test slnt14">varfont</p>
+<p class="test slnt14">varfont</p>
+<p class="test">varfont</p>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/slnt-variable.html b/testing/web-platform/tests/css/css-fonts/variations/slnt-variable.html
new file mode 100644
index 0000000000..d81df09c19
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/slnt-variable.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html lang="en">
+<meta charset="utf-8" />
+<title>CSS Test: Variable fonts with slant axis</title>
+<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#descdef-font-face-font-variation-settings" />
+<link rel="help" href="http://w3c.github.io/csswg-drafts/css-fonts-4/#valdef-font-style-oblique-angle-90deg-90deg" />
+<link rel="match" href="slnt-variable-ref.html">
+<meta name="assert"
+  content="For variable fonts, 'oblique' and 'italic' keywords should work equivalent to 14 degrees of slant">
+<!-- Fonts used in this test are authored by Stephen Nixon, more information in the link:
+https://arrowtype.github.io/vf-slnt-test/index.html -->
+<style>
+  @font-face {
+    font-family: "slnt test font";
+    src: url('resources/FontStyleTest-slnt-VF.woff2');
+    font-style: oblique 0deg 15deg;
+  }
+
+  .test {
+    font-family: "slnt test font";
+    font-size: 3em;
+  }
+
+  .oblique {
+    font-style: oblique;
+  }
+
+  .italic {
+    font-style: italic;
+  }
+
+</style>
+
+<p class="test oblique">varfont</p>
+<p class="test italic">varfont</p>
+<p class="test">varfont</p>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-box-font-ref.html b/testing/web-platform/tests/css/css-fonts/variations/variable-box-font-ref.html
new file mode 100644
index 0000000000..142b0aa46b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-box-font-ref.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    font-size: 200px;
+    }
+</style>
+▄ ▀
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-box-font.html b/testing/web-platform/tests/css/css-fonts/variations/variable-box-font.html
new file mode 100644
index 0000000000..a9023fabe5
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-box-font.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="match" href="variable-box-font-ref.html">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box,
+    sans-serif;
+    font-size: 200px;
+    }
+
+    .a_up {
+    font-variation-settings: "UPWD" 350;
+    }
+</style>
+<!-- The variabletest_box font has an A glyph that looks like a lower half box,
+  with deltas on the 'UPWD' variation axis that allow shifting the box up. At
+  350, the box is at the top. The font also has two glyphs for UPPER HALF BLOCK
+  and LOWER HALF BLOCK, which look identical to the respective variations of A.
+-->
+A <span class="a_up">A</span>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b-ref.html b/testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b-ref.html
new file mode 100644
index 0000000000..c6b80b1b11
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    sans-serif;
+    font-size: 100px;
+    }
+</style>
+M&#x033B; N&#x033B; O&#x033B;
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b.html b/testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b.html
new file mode 100644
index 0000000000..c39cce33a6
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-gpos-m2b.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="match" href="variable-gpos-m2b-ref.html">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    sans-serif;
+    font-size: 100px;
+    }
+
+    .gpos_m2b_left {
+    font-variation-settings: "VM2B" 0;
+    }
+
+    .gpos_m2b_middle {
+    font-variation-settings: "VM2B" 500;
+    }
+
+    .gpos_m2b_right {
+    font-variation-settings: "VM2B" 1000;
+    }
+</style>
+<!-- The variabletest_box font has an M glyph saying "m2b pos" that combines
+     with the combining box below. And it has a glyph for combining box below
+     whose mark anchor can be shifted horizontally using the VM2B axis. The font
+     also has N and O glyphs which have fixed shifted base anchor points at the
+     middle and at the right position. In this reftest we check whether
+     applying the VM2B axis works as expected and shifts the mark anchor point
+     left so that the combining mark is placed correctly at the middle and at
+     the right position. The VM2B rendering must be identical to the
+     conventional rendering with the fixed base anchor points. -->
+<span class="gpos_m2b_left">M&#x033B;</span>
+<span class="gpos_m2b_middle">M&#x033B;</span>
+<span class="gpos_m2b_right">M&#x033B;</span>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-gsub-ref.html b/testing/web-platform/tests/css/css-fonts/variations/variable-gsub-ref.html
new file mode 100644
index 0000000000..3b1f7f435c
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-gsub-ref.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    sans-serif;
+    font-size: 100px;
+    }
+</style>
+r R
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html b/testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html
new file mode 100644
index 0000000000..ed432f65eb
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-gsub.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="match" href="variable-gsub-ref.html">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    sans-serif;
+    font-size: 100px;
+    }
+
+    .rvrn_replaced {
+    font-variation-settings: "FVTT" 10;
+    }
+</style>
+<!-- The variabletest_box font has an r glyph that says "rvrn base" and has
+     this as a name as well. And it has a glyph for R that says "rvrn subst"
+     where rvrn stands for the required Required Variation Alternates
+     feature. The font has an 'FVTT' axis ranging from 0 to 10, where it uses
+     a single substitution glyph lookup table for axis values starting from
+     5, which then replaces the rvrn_base glyph with the rvrn_subst
+     glyph. So in this reftest the substituted glyph for lowercase r
+     should visually match the uppercase R glyph, both show "rvrn subst". -->
+r <span class="rvrn_replaced">r</span>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-ref.html b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-ref.html
new file mode 100644
index 0000000000..24080345ba
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-ref.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    font-optical-sizing: none;
+    }
+</style>
+<div style="font-size:   6px; font-variation-settings: 'opsz'    6;">B</div>
+<div style="font-size:  12px; font-variation-settings: 'opsz'   12;">B</div>
+<div style="font-size:  24px; font-variation-settings: 'opsz'   24;">B</div>
+<div style="font-size:  48px; font-variation-settings: 'opsz'   48;">B</div>
+<div style="font-size:  64px; font-variation-settings: 'opsz'   64;">B</div>
+<div style="font-size: 128px; font-variation-settings: 'opsz'  128;">B</div>
+<div style="font-size:  24px; font-variation-settings: 'opsz'  128;">B</div>
+<div style="font-size:  48px; font-variation-settings: 'opsz'   12;">B</div>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust-ref.html b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust-ref.html
new file mode 100644
index 0000000000..4e88cace35
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust-ref.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    font-optical-sizing: none;
+    }
+
+    div {
+    line-height: 64px;
+    }
+
+</style>
+<div style="font-size:   9px; font-variation-settings: 'opsz'    9;">B</div>
+<div style="font-size:  18px; font-variation-settings: 'opsz'   18;">B</div>
+<div style="font-size:  36px; font-variation-settings: 'opsz'   36;">B</div>
+<div style="font-size:  72px; font-variation-settings: 'opsz'   72;">B</div>
+<div style="font-size:  96px; font-variation-settings: 'opsz'   96;">B</div>
+<div style="font-size:  36px; font-variation-settings: 'opsz'  128;">B</div>
+<div style="font-size:  72px; font-variation-settings: 'opsz'   12;">B</div>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust.html b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust.html
new file mode 100644
index 0000000000..b673f3cb7b
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz-size-adjust.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="author" title="Dominik Röttsches" href="drott@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-optical-sizing-def"/>
+<link rel="help" href="https://drafts.csswg.org/css-fonts-5/#size-adjust-desc"/>
+<meta name="assert" content="Ensures that optical size is adjusted with size-adjust to displayed font size."/>
+<link rel="match" href="variable-opsz-size-adjust-ref.html">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    size-adjust: 150%;
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    }
+
+    div {
+    line-height: 64px;
+    }
+</style>
+<!-- The variabletest_box font file contains a glyph for letter B which moves a
+  horizontal bar up from the middle for opsz > 12 and moves it down for opsz <
+  12 where the opsz axis ranges from 6 to 128. -->
+<div style="font-size:   6px;">B</div>
+<div style="font-size:  12px;">B</div>
+<div style="font-size:  24px;">B</div>
+<div style="font-size:  48px;">B</div>
+<div style="font-size:  64px;">B</div>
+<!-- Explicit value overrides auto. -->
+<div style="font-size:  24px; font-variation-settings: 'opsz' 128;">B</div>
+<div style="font-size:  48px; font-optical-sizing: none;">B</div>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
diff --git a/testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html
new file mode 100644
index 0000000000..d274a47828
--- /dev/null
+++ b/testing/web-platform/tests/css/css-fonts/variations/variable-opsz.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+<link rel="author" title="Dominik Röttsches" href="drott@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#font-optical-sizing-def"/>
+<meta name="assert" content="Ensures that optical size is automatically applied."/>
+<link rel="match" href="variable-opsz-ref.html">
+<meta charset="utf-8">
+<style>
+    @font-face {
+    font-family: variabletest_box;
+    src: url(resources/variabletest_box.ttf);
+    }
+
+    body {
+    font-family: variabletest_box, sans-serif;
+    }
+</style>
+<!-- The variabletest_box font file contains a glyph for letter B which moves a
+  horizontal bar up from the middle for opsz > 12 and moves it down for opsz >
+  12 where the opsz axis ranges from 12 to 128. -->
+<div style="font-size:   6px;">B</div>
+<div style="font-size:  12px;">B</div>
+<div style="font-size:  24px;">B</div>
+<div style="font-size:  48px;">B</div>
+<div style="font-size:  64px;">B</div>
+<div style="font-size: 128px;">B</div>
+<!-- Explicit value overrides auto. -->
+<div style="font-size:  24px; font-variation-settings: 'opsz' 128;">B</div>
+<div style="font-size:  48px; font-optical-sizing: none;">B</div>
+<script>
+    document.fonts.ready.then(
+        () => { document.documentElement.classList.remove("reftest-wait"); });
+</script>
+</html>
-- 
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