diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 490decd5b950..4718e316049b 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -331821,6 +331821,18 @@
      {}
     ]
    ],
+   "css/css-display/parsing/display-invalid.html": [
+    [
+     "/css/css-display/parsing/display-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-display/parsing/display-valid.html": [
+    [
+     "/css/css-display/parsing/display-valid.html",
+     {}
+    ]
+   ],
    "css/css-env/at-supports.tentative.html": [
     [
      "/css/css-env/at-supports.tentative.html",
@@ -334061,6 +334073,66 @@
      {}
     ]
    ],
+   "css/css-grid/parsing/grid-area-invalid.html": [
+    [
+     "/css/css-grid/parsing/grid-area-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-area-valid.html": [
+    [
+     "/css/css-grid/parsing/grid-area-valid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-auto-columns-invalid.html": [
+    [
+     "/css/css-grid/parsing/grid-auto-columns-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-auto-columns-valid.html": [
+    [
+     "/css/css-grid/parsing/grid-auto-columns-valid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-auto-flow-invalid.html": [
+    [
+     "/css/css-grid/parsing/grid-auto-flow-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-auto-flow-valid.html": [
+    [
+     "/css/css-grid/parsing/grid-auto-flow-valid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-auto-rows-invalid.html": [
+    [
+     "/css/css-grid/parsing/grid-auto-rows-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-auto-rows-valid.html": [
+    [
+     "/css/css-grid/parsing/grid-auto-rows-valid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-template-areas-invalid.html": [
+    [
+     "/css/css-grid/parsing/grid-template-areas-invalid.html",
+     {}
+    ]
+   ],
+   "css/css-grid/parsing/grid-template-areas-valid.html": [
+    [
+     "/css/css-grid/parsing/grid-template-areas-valid.html",
+     {}
+    ]
+   ],
    "css/css-images/gradient/color-stops-parsing.html": [
     [
      "/css/css-images/gradient/color-stops-parsing.html",
@@ -529034,6 +529106,14 @@
    "f8d6e85cee2325f3ae51a950a276430d26c04189",
    "testharness"
   ],
+  "css/css-display/parsing/display-invalid.html": [
+   "70516ad4901f684b9d0ecd49a82671172fbc8f14",
+   "testharness"
+  ],
+  "css/css-display/parsing/display-valid.html": [
+   "efa48350a62dd0210009069475ac9243bba51104",
+   "testharness"
+  ],
   "css/css-display/run-in/META.yml": [
    "ad40907fb0382fb83be02ad10e05031e284f3b9f",
    "support"
@@ -543022,6 +543102,46 @@
    "29eca9dbc6f5738f7d6f929385453d64dcdf0aea",
    "reftest"
   ],
+  "css/css-grid/parsing/grid-area-invalid.html": [
+   "b989322775eb7dbf273a3dc3fbb3d1af31f524ba",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-area-valid.html": [
+   "8e7d0d43d1cfac44935593892b67fdb40b179791",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-auto-columns-invalid.html": [
+   "e7a965f34ad35f32589b6fc895d65946812e0749",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-auto-columns-valid.html": [
+   "ba1f5f60d657ebd2629c94b90c971bb081ea7917",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-auto-flow-invalid.html": [
+   "a261e8eba11fd295eb33c9288a7e30f589374331",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-auto-flow-valid.html": [
+   "4270a3df933f372792139cae7c39344ff69482dc",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-auto-rows-invalid.html": [
+   "7fceaa0f1639494847cc06a7f93876992d620b3c",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-auto-rows-valid.html": [
+   "cf63e2b7d52a6fffc5577bc55e37dfd6aa0cd5b8",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-template-areas-invalid.html": [
+   "5bc70c5697a2a642ce80b902851f3687eba901d7",
+   "testharness"
+  ],
+  "css/css-grid/parsing/grid-template-areas-valid.html": [
+   "8d8f6823267eea15e987ea89e992f1ed0b2f7726",
+   "testharness"
+  ],
   "css/css-grid/placement/grid-layout-grid-span.html": [
    "21aad99708c96942c196ada03beaded1d73a1078",
    "reftest"
diff --git a/testing/web-platform/tests/css/css-display/parsing/display-invalid.html b/testing/web-platform/tests/css/css-display/parsing/display-invalid.html
new file mode 100644
index 000000000000..70516ad4901f
--- /dev/null
+++ b/testing/web-platform/tests/css/css-display/parsing/display-invalid.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Display: parsing display with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#display-prop">
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<meta name="assert" content="display supports only the spec grammar.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("display", "grid inline-grid");
+test_invalid_value("display", "none grid");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-display/parsing/display-valid.html b/testing/web-platform/tests/css/css-display/parsing/display-valid.html
new file mode 100644
index 000000000000..efa48350a62d
--- /dev/null
+++ b/testing/web-platform/tests/css/css-display/parsing/display-valid.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Display: parsing display with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css2/visuren.html#display-prop">
+<link rel="help" href="https://drafts.csswg.org/css-display/#the-display-properties">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
+<meta name="assert" content="display supports the full spec grammar.">
+<meta name="assert" content="display supports the new values 'grid | inline-grid'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// https://drafts.csswg.org/css-grid-1/#grid-containers
+test_valid_value("display", "grid");
+test_valid_value("display", "inline-grid");
+
+// https://drafts.csswg.org/css2/visuren.html#display-prop
+test_valid_value("display", "inline");
+test_valid_value("display", "block");
+test_valid_value("display", "list-item");
+test_valid_value("display", "inline-block");
+test_valid_value("display", "table");
+test_valid_value("display", "inline-table");
+test_valid_value("display", "table-row-group");
+test_valid_value("display", "table-header-group");
+test_valid_value("display", "table-footer-group");
+test_valid_value("display", "table-row");
+test_valid_value("display", "table-column-group");
+test_valid_value("display", "table-column");
+test_valid_value("display", "table-cell");
+test_valid_value("display", "table-caption");
+test_valid_value("display", "none");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-area-invalid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-area-invalid.html
new file mode 100644
index 000000000000..b989322775eb
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-area-invalid.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-area with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-area">
+<meta name="assert" content="grid-area supports only the grammar '<grid-line> [ / <grid-line> ]{0,3}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("grid-area", "'string'");
+test_invalid_value("grid-row", "1.0");
+test_invalid_value("grid-column", "1 2");
+test_invalid_value("grid-row-start", "+-3");
+test_invalid_value("grid-column-start", "0");
+test_invalid_value("grid-row-end", "span");
+test_invalid_value("grid-column-end", "sPaN");
+test_invalid_value("grid-column-end", '"1st"');
+test_invalid_value("grid-column-end", "1st");
+
+test_invalid_value("grid-area", "auto / initial");
+test_invalid_value("grid-row", "auto / inherit");
+test_invalid_value("grid-column", "auto / unset");
+
+test_invalid_value("grid-area", "auto / auto / auto / auto / auto");
+test_invalid_value("grid-row", "1 / 2 / 3")
+test_invalid_value("grid-column", "a / b / c");
+test_invalid_value("grid-row-end", "span 1 / span 2");
+test_invalid_value("grid-area", "auto 2 auto 4");
+test_invalid_value("grid-row", "33 -A0 auto");
+test_invalid_value("grid-row", "auto i 2 j span 3 k");
+
+
+// https://github.com/w3c/csswg-drafts/issues/2856
+test_invalid_value("grid-row-end", "1 auto");
+test_invalid_value("grid-row-end", "span 1 auto");
+test_invalid_value("grid-row-end", "span auto 1");
+test_invalid_value("grid-row-end", "1 auto span");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-area-valid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-area-valid.html
new file mode 100644
index 000000000000..8e7d0d43d1cf
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-area-valid.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-area with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-area">
+<meta name="assert" content="grid-area supports the full grammar '<grid-line> [ / <grid-line> ]{0,3}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// auto
+test_valid_value("grid-area", "auto", "auto / auto / auto / auto");
+test_valid_value("grid-area", "AuTo", "auto / auto / auto / auto");
+test_valid_value("grid-row", "auto", "auto / auto");
+test_valid_value("grid-column-end", "AuTo", "auto");
+
+// <custom-ident>
+test_valid_value("grid-area", "--a", "--a / --a / --a / --a");
+test_valid_value("grid-row", "-zπ", "-zπ / -zπ");
+test_valid_value("grid-row-start", "AZ");
+test_valid_value("grid-column-start", "-_π");
+test_valid_value("grid-row-end", "_9");
+
+
+// <integer> && <custom-ident>?
+test_valid_value("grid-area", "1", "1 / auto / auto / auto");
+test_valid_value("grid-area", "+90 -a-", "90 -a- / auto / auto / auto");
+test_valid_value("grid-row", "az 2", "2 az / auto");
+test_valid_value("grid-column", "9", "9 / auto");
+test_valid_value("grid-column", "-19 zA", "-19 zA / auto");
+test_valid_value("grid-column", "-A0 33", "33 -A0 / auto");
+test_valid_value("grid-row-start", "-19");
+test_valid_value("grid-row-start", "9 -Z_");
+test_valid_value("grid-column-start", "+90", "90");
+test_valid_value("grid-column-start", "Z -44", "-44 Z");
+test_valid_value("grid-row-end", "1 -πA");
+test_valid_value("grid-column-end", "π_ +5", "5 π_");
+
+// span && [ <integer> || <custom-ident> ]
+test_valid_value("grid-area", "span 2 i", "span 2 i / auto / auto / auto");
+test_valid_value("grid-area", "i 2 SpAn", "span 2 i / auto / auto / auto");
+test_valid_value("grid-row", "span 2", "span 2 / auto");
+test_valid_value("grid-column", "i SpAn", "span i / auto");
+test_valid_value("grid-row-start", "span i", "span i");
+test_valid_value("grid-column-start", "SpAn i 2", "span 2 i");
+test_valid_value("grid-row-end", "2 i span", "span 2 i");
+test_valid_value("grid-column-end", "2 SpAn", "span 2");
+
+// <grid-line> [ / <grid-line> ]{0,3}
+test_valid_value("grid-area", "auto / i", "auto / i / auto / i");
+test_valid_value("grid-area", "auto / i / 2 j", "auto / i / 2 j / i");
+test_valid_value("grid-area", "auto / i / 2 j / span 3 k");
+test_valid_value("grid-row", "auto / i");
+test_valid_value("grid-column", "2 j / span 3 k");
+
+
+// https://github.com/w3c/csswg-drafts/issues/2858
+// '\\31 st' in Blink, Firefox, '1st' in Edge, '"1st"' in Safari.
+test_valid_value("grid-column-end",  "\\31st", ["\\31 st", "1st", '"1st"']);
+test_valid_value("grid-column-end",  "\\31 st", ["\\31 st", "1st", '"1st"']);
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-auto-columns-invalid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-columns-invalid.html
new file mode 100644
index 000000000000..e7a965f34ad3
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-columns-invalid.html
@@ -0,0 +1,37 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-auto-columns with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-columns">
+<meta name="assert" content="grid-auto-columns supports only the grammar '<track-size>+'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// <track-breadth>
+test_invalid_value("grid-auto-columns", "none");
+test_invalid_value("grid-auto-columns", "-1px");
+test_invalid_value("grid-auto-columns", "-4%");
+
+// minmax( <inflexible-breadth> , <track-breadth> )
+test_invalid_value("grid-auto-columns", "minmax(1px)");
+test_invalid_value("grid-auto-columns", "minmax(1px, 2px, 3px)");
+test_invalid_value("grid-auto-columns", "minmax(5fr, 1px)");
+test_invalid_value("grid-auto-columns", "minmax(6px, -7%)");
+test_invalid_value("grid-auto-columns", "minmax(8px, -9fr)");
+
+// fit-content( <length-percentage> )
+test_invalid_value("grid-auto-columns", "fit-content(-1px)");
+test_invalid_value("grid-auto-columns", "fit-content(1px, 2px)");
+test_invalid_value("grid-auto-columns", "fit-content(1px auto)");
+
+// <track-size>+
+test_invalid_value("grid-auto-columns", "2em / 3em");
+test_invalid_value("grid-auto-columns", "auto, 10%");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-auto-columns-valid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-columns-valid.html
new file mode 100644
index 000000000000..ba1f5f60d657
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-columns-valid.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-auto-columns with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-columns">
+<meta name="assert" content="grid-auto-columns supports the full grammar '<track-size>+'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// <track-breadth>
+// <track-breadth> = <length-percentage> | <flex> | min-content | max-content | auto
+test_valid_value("grid-auto-columns", "1px");
+test_valid_value("grid-auto-columns", "2em");
+test_valid_value("grid-auto-columns", "calc(2em + 3ex)");
+test_valid_value("grid-auto-columns", "4%");
+test_valid_value("grid-auto-columns", "5fr");
+test_valid_value("grid-auto-columns", "min-content");
+test_valid_value("grid-auto-columns", "max-content");
+test_valid_value("grid-auto-columns", "auto");
+
+// minmax( <inflexible-breadth> , <track-breadth> )
+// <inflexible-breadth> = <length-percentage> | min-content | max-content | auto
+test_valid_value("grid-auto-columns", "minmax(1px, 5fr)");
+test_valid_value("grid-auto-columns", "minmax(2em, min-content)");
+test_valid_value("grid-auto-columns", "minmax(calc(2em + 3ex), max-content)");
+test_valid_value("grid-auto-columns", "minmax(4%, auto)");
+test_valid_value("grid-auto-columns", "minmax(5vmin, 1px)");
+test_valid_value("grid-auto-columns", "minmax(min-content, 2em)");
+test_valid_value("grid-auto-columns", "minmax(max-content, calc(2em + 3ex))");
+test_valid_value("grid-auto-columns", "minmax(auto, 4%)");
+
+// fit-content( <length-percentage> )
+test_valid_value("grid-auto-columns", "fit-content(1px)");
+test_valid_value("grid-auto-columns", "fit-content(2em)");
+test_valid_value("grid-auto-columns", "fit-content(calc(2em + 3ex))");
+test_valid_value("grid-auto-columns", "fit-content(4%)");
+
+test_valid_value("grid-auto-columns", "0px");
+test_valid_value("grid-auto-columns", "0%");
+test_valid_value("grid-auto-columns", "0fr");
+test_valid_value("grid-auto-columns", "minmax(auto, 0%)");
+test_valid_value("grid-auto-columns", "fit-content(0px)");
+
+// <track-size>+
+test_valid_value("grid-auto-columns", "1px 2px 3px 0px");
+test_valid_value("grid-auto-columns", "fit-content(1px) minmax(2px, 3px) 4px");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-auto-flow-invalid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-flow-invalid.html
new file mode 100644
index 000000000000..a261e8eba11f
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-flow-invalid.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-auto-flow with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-flow">
+<meta name="assert" content="grid-auto-flow supports only the grammar '[ row | column ] || dense'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("grid-auto-flow", "auto");
+test_invalid_value("grid-auto-flow", "row dense column");
+test_invalid_value("grid-auto-flow", "dense row dense");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-auto-flow-valid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-flow-valid.html
new file mode 100644
index 000000000000..4270a3df933f
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-flow-valid.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-auto-flow with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-flow">
+<meta name="assert" content="grid-auto-flow supports the full grammar '[ row | column ] || dense'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("grid-auto-flow", "row");
+test_valid_value("grid-auto-flow", "column");
+test_valid_value("grid-auto-flow", "row dense");
+test_valid_value("grid-auto-flow", "dense column", "column dense");
+
+// Blink/WebKit "dense", Edge/Firefox "row dense"
+test_valid_value("grid-auto-flow", "dense", ["dense", "row dense"]);
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-auto-rows-invalid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-rows-invalid.html
new file mode 100644
index 000000000000..7fceaa0f1639
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-rows-invalid.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-auto-rows with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-rows">
+<meta name="assert" content="grid-auto-rows supports only the grammar '<track-size>+'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// <track-breadth>
+test_invalid_value("grid-auto-rows", "none");
+test_invalid_value("grid-auto-rows", "-1px");
+test_invalid_value("grid-auto-rows", "-4%");
+
+// minmax( <inflexible-breadth> , <track-breadth> )
+test_invalid_value("grid-auto-rows", "minmax(1px)");
+test_invalid_value("grid-auto-rows", "minmax(1px, 2px, 3px)");
+test_invalid_value("grid-auto-rows", "minmax(5fr, 1px)");
+test_invalid_value("grid-auto-rows", "minmax(6px, -7%)");
+
+// fit-content( <length-percentage> )
+test_invalid_value("grid-auto-rows", "fit-content(-1px)");
+test_invalid_value("grid-auto-rows", "fit-content(1px, 2px)");
+test_invalid_value("grid-auto-rows", "fit-content(1px auto)");
+
+// <track-size>+
+test_invalid_value("grid-auto-rows", "2em / 3em");
+test_invalid_value("grid-auto-rows", "auto, 10%");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-auto-rows-valid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-rows-valid.html
new file mode 100644
index 000000000000..cf63e2b7d52a
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-auto-rows-valid.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-auto-rows with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-rows">
+<meta name="assert" content="grid-auto-rows supports the full grammar '<track-size>+'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// <track-breadth>
+// <track-breadth> = <length-percentage> | <flex> | min-content | max-content | auto
+test_valid_value("grid-auto-rows", "1px");
+test_valid_value("grid-auto-rows", "2em");
+test_valid_value("grid-auto-rows", "calc(2em + 3ex)");
+test_valid_value("grid-auto-rows", "4%");
+test_valid_value("grid-auto-rows", "5fr");
+test_valid_value("grid-auto-rows", "min-content");
+test_valid_value("grid-auto-rows", "max-content");
+test_valid_value("grid-auto-rows", "auto");
+
+// minmax( <inflexible-breadth> , <track-breadth> )
+// <inflexible-breadth> = <length-percentage> | min-content | max-content | auto
+test_valid_value("grid-auto-rows", "minmax(1px, 5fr)");
+test_valid_value("grid-auto-rows", "minmax(2em, min-content)");
+test_valid_value("grid-auto-rows", "minmax(calc(2em + 3ex), max-content)");
+test_valid_value("grid-auto-rows", "minmax(4%, auto)");
+test_valid_value("grid-auto-rows", "minmax(5vmin, 1px)");
+test_valid_value("grid-auto-rows", "minmax(min-content, 2em)");
+test_valid_value("grid-auto-rows", "minmax(max-content, calc(2em + 3ex))");
+test_valid_value("grid-auto-rows", "minmax(auto, 4%)");
+
+// fit-content( <length-percentage> )
+test_valid_value("grid-auto-rows", "fit-content(1px)");
+test_valid_value("grid-auto-rows", "fit-content(2em)");
+test_valid_value("grid-auto-rows", "fit-content(calc(2em + 3ex))");
+test_valid_value("grid-auto-rows", "fit-content(4%)");
+
+test_valid_value("grid-auto-rows", "0px");
+test_valid_value("grid-auto-rows", "0%");
+test_valid_value("grid-auto-rows", "0fr");
+test_valid_value("grid-auto-rows", "minmax(auto, 0%)");
+test_valid_value("grid-auto-rows", "fit-content(0px)");
+
+// <track-size>+
+test_valid_value("grid-auto-rows", "1px 2px 3px 0px");
+test_valid_value("grid-auto-rows", "fit-content(1px) minmax(2px, 3px) 4px");
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-template-areas-invalid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-template-areas-invalid.html
new file mode 100644
index 000000000000..5bc70c5697a2
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-template-areas-invalid.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-template-areas with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-areas">
+<meta name="assert" content="grid-template-areas supports only the grammar 'none | <string>+'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("grid-template-areas", "auto");
+test_invalid_value("grid-template-areas", 'none "first"');
+test_invalid_value("grid-template-areas", '"first" none');
+</script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/css/css-grid/parsing/grid-template-areas-valid.html b/testing/web-platform/tests/css/css-grid/parsing/grid-template-areas-valid.html
new file mode 100644
index 000000000000..8d8f6823267e
--- /dev/null
+++ b/testing/web-platform/tests/css/css-grid/parsing/grid-template-areas-valid.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: parsing grid-template-areas with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-areas">
+<meta name="assert" content="grid-template-areas supports the full grammar 'none | <string>+'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("grid-template-areas", "none");
+test_valid_value("grid-template-areas", '"first"');
+test_valid_value("grid-template-areas", '"first second"');
+test_valid_value("grid-template-areas", '"1st 2nd 3rd"');
+test_valid_value("grid-template-areas", '"first second" "third fourth"');
+test_valid_value("grid-template-areas", '"first second" "third ." "1st 2nd" "3rd 4th"');
+
+// Firefox preserves specific whitespace and full stop sequences.
+// Other browsers consolidate to ' ' and '.'
+test_valid_value("grid-template-areas", '"  a  \t  b  "', '"a b"'); // Fails in Firefox
+test_valid_value("grid-template-areas", '"c\td"', ['"c d"', '"c\\9 d"']);
+test_valid_value("grid-template-areas", '"first ..."', ['"first ."', '"first ..."']);
+</script>
+</body>
+</html>