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diff --git a/layout/style/test/test_non_content_accessible_values.html b/layout/style/test/test_non_content_accessible_values.html
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+++ b/layout/style/test/test_non_content_accessible_values.html
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+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style id="sheet"></style>
+<div></div>
+<script>
+const NON_CONTENT_ACCESSIBLE_VALUES = {
+  "color": [
+    "-moz-buttonactivetext",
+    "-moz-buttonactiveface",
+    "-moz-buttondisabledface",
+    "-moz-disabledfield",
+    "-moz-colheaderhovertext",
+    "-moz-colheadertext",
+    "-moz-nativevisitedhyperlinktext",
+    "text-select-disabled-background",
+    "text-select-attention-background",
+    "text-select-attention-foreground",
+    "-moz-autofill-background",
+  ],
+  "display": [
+    "-moz-box",
+    "-moz-inline-box",
+  ],
+  "font": [
+      "-moz-pull-down-menu",
+      "-moz-button",
+      "-moz-list",
+      "-moz-field",
+  ],
+  "-moz-appearance": [
+    "button-arrow-down",
+    "button-arrow-next",
+    "button-arrow-previous",
+    "button-arrow-up",
+    "button-focus",
+    "dualbutton",
+    "groupbox",
+    "menubar",
+    "menuitem",
+    "checkmenuitem",
+    "radiomenuitem",
+    "menuitemtext",
+    "menupopup",
+    "menucheckbox",
+    "menuradio",
+    "menuseparator",
+    "menuimage",
+    "-moz-menulist-arrow-button",
+    "checkbox-container",
+    "radio-container",
+    "checkbox-label",
+    "radio-label",
+    "resizerpanel",
+    "resizer",
+    "scrollbar",
+    "scrollbar-small",
+    "scrollbar-horizontal",
+    "scrollbar-vertical",
+    "scrollbarbutton-up",
+    "scrollbarbutton-down",
+    "scrollbarbutton-left",
+    "scrollbarbutton-right",
+    "scrollcorner",
+    "separator",
+    "spinner",
+    "spinner-upbutton",
+    "spinner-downbutton",
+    "spinner-textfield",
+    "splitter",
+    "statusbar",
+    "statusbarpanel",
+    "tab",
+    "tabpanel",
+    "tabpanels",
+    "tab-scroll-arrow-back",
+    "tab-scroll-arrow-forward",
+    "toolbar",
+    "toolbarbutton",
+    "toolbarbutton-dropdown",
+    "toolbargripper",
+    "toolbox",
+    "tooltip",
+    "treeheader",
+    "treeheadercell",
+    "treeheadersortarrow",
+    "treeitem",
+    "treeline",
+    "treetwisty",
+    "treetwistyopen",
+    "treeview",
+    "window",
+    "dialog",
+    "-moz-win-communications-toolbox",
+    "-moz-win-media-toolbox",
+    "-moz-win-browsertabbar-toolbox",
+    "-moz-win-borderless-glass",
+    "-moz-win-exclude-glass",
+    "-moz-mac-help-button",
+    "-moz-window-button-box",
+    "-moz-window-button-box-maximized",
+    "-moz-window-button-close",
+    "-moz-window-button-maximize",
+    "-moz-window-button-minimize",
+    "-moz-window-button-restore",
+    "-moz-window-titlebar",
+    "-moz-window-titlebar-maximized",
+    "-moz-mac-active-source-list-selection",
+    "-moz-mac-disclosure-button-closed",
+    "-moz-mac-disclosure-button-open",
+    "-moz-mac-source-list",
+    "-moz-mac-source-list-selection",
+
+    "button-bevel",
+    "caret",
+    "listitem",
+    "menulist-textfield",
+    "menulist-text",
+  ],
+  "user-select": [
+    "-moz-text",
+  ],
+  "line-height": [
+    "-moz-block-height",
+  ],
+  "text-align": [
+    "-moz-center-or-inherit",
+  ],
+};
+
+const sheet = document.getElementById("sheet");
+const div = document.querySelector("div");
+
+test(function() {
+  sheet.textContent = `div { color: initial }`;
+  assert_equals(sheet.sheet.cssRules[0].style.length, 1);
+}, "sanity");
+
+for (const prop in NON_CONTENT_ACCESSIBLE_VALUES) {
+  const values = NON_CONTENT_ACCESSIBLE_VALUES[prop];
+  test(function() {
+    for (const value of values) {
+      sheet.textContent = `div { ${prop}: ${value} }`;
+      const block = sheet.sheet.cssRules[0].style;
+      assert_equals(
+        block.length,
+        0,
+        `${prop}: ${value} should not be parsed in content`
+      );
+      block.setProperty(prop, value);
+      assert_equals(
+        block.length,
+        0,
+        `${prop}: ${value} should not be settable via CSSOM in content`
+      );
+      div.style.setProperty(prop, value);
+      assert_equals(
+        div.style.length,
+        0,
+        `${prop}: ${value} should not be settable via CSSOM in content (inline style)`
+      );
+      assert_not_equals(
+        getComputedStyle(div).getPropertyValue(prop),
+        value,
+        `${prop}: ${value} should not be settable via CSSOM in content (gcs)`
+      );
+
+      assert_false(CSS.supports(prop, value), `${prop}: ${value} should not claim to be supported`)
+    }
+  }, prop + " non-accessible values: " + values.join(", "))
+}
+</script>