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diff --git a/devtools/shared/css/generated/generate-properties-db.js b/devtools/shared/css/generated/generate-properties-db.js
new file mode 100644
index 000000000..ad8dfb0ab
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+++ b/devtools/shared/css/generated/generate-properties-db.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+/*
+ * This is an xpcshell script that runs to generate a static list of CSS properties
+ * as known by the platform. It is run from ./mach_commands.py by running
+ * `mach devtools-css-db`.
+ */
+var {require} = Components.utils.import("resource://devtools/shared/Loader.jsm", {});
+var {generateCssProperties} = require("devtools/server/actors/css-properties");
+
+// xpcshell can output extra information, so place some delimiter text between
+// the output of the css properties database.
+dump("DEVTOOLS_CSS_DB_DELIMITER");
+
+// Output JSON
+dump(JSON.stringify({
+  cssProperties: cssProperties(),
+  pseudoElements: pseudoElements()
+}));
+
+dump("DEVTOOLS_CSS_DB_DELIMITER");
+
+/*
+ * A list of CSS Properties and their various characteristics. This is used on the
+ * client-side when the CssPropertiesActor is not found, or when the client and server
+ * are the same version. A single property takes the form:
+ *
+ *  "animation": {
+ *    "isInherited": false,
+ *    "supports": [ 7, 9, 10 ]
+ *  }
+ */
+function cssProperties() {
+  const properties = generateCssProperties();
+  for (let key in properties) {
+    // Ignore OS-specific properties
+    if (key.indexOf("-moz-osx-") !== -1) {
+      properties[key] = undefined;
+    }
+  }
+  return properties;
+}
+
+/**
+ * The list of all CSS Pseudo Elements.
+ */
+function pseudoElements() {
+  const {classes: Cc, interfaces: Ci} = Components;
+  const domUtils = Cc["@mozilla.org/inspector/dom-utils;1"]
+                             .getService(Ci.inIDOMUtils);
+  return domUtils.getCSSPseudoElementNames();
+}