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diff --git a/devtools/server/actors/css-properties.js b/devtools/server/actors/css-properties.js
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+++ b/devtools/server/actors/css-properties.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";
+
+const protocol = require("devtools/shared/protocol");
+const { ActorClassWithSpec, Actor } = protocol;
+const { cssPropertiesSpec } = require("devtools/shared/specs/css-properties");
+const { cssColors } = require("devtools/shared/css/color-db");
+const InspectorUtils = require("InspectorUtils");
+
+loader.lazyRequireGetter(
+  this,
+  "CSS_TYPES",
+  "devtools/shared/css/constants",
+  true
+);
+
+exports.CssPropertiesActor = ActorClassWithSpec(cssPropertiesSpec, {
+  initialize(conn) {
+    Actor.prototype.initialize.call(this, conn);
+  },
+
+  destroy() {
+    Actor.prototype.destroy.call(this);
+  },
+
+  getCSSDatabase() {
+    const properties = generateCssProperties();
+    const pseudoElements = InspectorUtils.getCSSPseudoElementNames();
+    const supportedFeature = {
+      // checking for css-color-4 color function support.
+      "css-color-4-color-function": InspectorUtils.isValidCSSColor(
+        "rgb(1 1 1 / 100%)"
+      ),
+    };
+
+    return { properties, pseudoElements, supportedFeature };
+  },
+});
+
+/**
+ * Generate the CSS properties object. Every key is the property name, while
+ * the values are objects that contain information about that property.
+ *
+ * @return {Object}
+ */
+function generateCssProperties() {
+  const properties = {};
+  const propertyNames = InspectorUtils.getCSSPropertyNames({
+    includeAliases: true,
+  });
+  const colors = Object.keys(cssColors);
+
+  propertyNames.forEach(name => {
+    // Get the list of CSS types this property supports.
+    const supports = [];
+    for (const type in CSS_TYPES) {
+      if (safeCssPropertySupportsType(name, type)) {
+        supports.push(type);
+      }
+    }
+
+    // Don't send colors over RDP, these will be re-attached by the front.
+    let values = InspectorUtils.getCSSValuesForProperty(name);
+    if (values.includes("aliceblue")) {
+      values = values.filter(x => !colors.includes(x));
+      values.unshift("COLOR");
+    }
+
+    const subproperties = InspectorUtils.getSubpropertiesForCSSProperty(name);
+
+    properties[name] = {
+      isInherited: InspectorUtils.isInheritedProperty(name),
+      values,
+      supports,
+      subproperties,
+    };
+  });
+
+  return properties;
+}
+exports.generateCssProperties = generateCssProperties;
+
+/**
+ * Test if a CSS is property is known using server-code.
+ *
+ * @param {string} name
+ * @return {Boolean}
+ */
+function isCssPropertyKnown(name) {
+  try {
+    // If the property name is unknown, the cssPropertyIsShorthand
+    // will throw an exception.  But if it is known, no exception will
+    // be thrown; so we just ignore the return value.
+    InspectorUtils.cssPropertyIsShorthand(name);
+    return true;
+  } catch (e) {
+    return false;
+  }
+}
+
+exports.isCssPropertyKnown = isCssPropertyKnown;
+
+/**
+ * A wrapper for InspectorUtils.cssPropertySupportsType that ignores invalid
+ * properties.
+ *
+ * @param {String} name The property name.
+ * @param {number} type The type tested for support.
+ * @return {Boolean} Whether the property supports the type.
+ *        If the property is unknown, false is returned.
+ */
+function safeCssPropertySupportsType(name, type) {
+  try {
+    return InspectorUtils.cssPropertySupportsType(name, type);
+  } catch (e) {
+    return false;
+  }
+}