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diff --git a/devtools/shared/css/properties-db.js b/devtools/shared/css/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 file contains static lists of CSS properties and values. Some of the small lists
+ * are edited manually, while the larger ones are generated by a script. The comments
+ * above each list indicates how it should be updated.
+ */
+
+let db;
+
+// Allow this require to fail in case it's been deleted in the process of running
+// `mach devtools-css-db` to regenerate the database.
+try {
+  db = require("devtools/shared/css/generated/properties-db");
+} catch (error) {
+  console.error(`If this error is being displayed and "mach devtools-css-db" is not ` +
+                `being run, then it needs to be fixed.`, error);
+  db = {
+    CSS_PROPERTIES: {},
+    PSEUDO_ELEMENTS: []
+  };
+}
+
+/**
+ * All CSS types that properties can support. This list can be manually edited.
+ */
+exports.CSS_TYPES = {
+  "ANGLE": 1,
+  "COLOR": 2,
+  "FREQUENCY": 3,
+  "GRADIENT": 4,
+  "IMAGE_RECT": 5,
+  "LENGTH": 6,
+  "NUMBER": 7,
+  "PERCENTAGE": 8,
+  "TIME": 9,
+  "TIMING_FUNCTION": 10,
+  "URL": 11,
+};
+
+/**
+ * All CSS <angle> types that properties can support. This list can be manually edited.
+ */
+exports.CSS_ANGLEUNIT = {
+  "deg": "deg",
+  "rad": "rad",
+  "grad": "grad",
+  "turn": "turn"
+};
+
+/**
+ * All cubic-bezier CSS timing-function names. This list can be manually edited.
+ */
+exports.BEZIER_KEYWORDS = ["linear", "ease-in-out", "ease-in", "ease-out", "ease"];
+
+/**
+ * Functions that accept a color argument. This list can be manually edited.
+ */
+exports.COLOR_TAKING_FUNCTIONS = ["linear-gradient", "-moz-linear-gradient",
+                                  "repeating-linear-gradient",
+                                  "-moz-repeating-linear-gradient", "radial-gradient",
+                                  "-moz-radial-gradient", "repeating-radial-gradient",
+                                  "-moz-repeating-radial-gradient", "drop-shadow"];
+
+/**
+ * Functions that accept an angle argument. This list can be manually edited.
+ */
+exports.ANGLE_TAKING_FUNCTIONS = ["linear-gradient", "-moz-linear-gradient",
+                                  "repeating-linear-gradient",
+                                  "-moz-repeating-linear-gradient", "rotate", "rotateX",
+                                  "rotateY", "rotateZ", "rotate3d", "skew", "skewX",
+                                  "skewY", "hue-rotate"];
+
+/**
+ * The list of all CSS Pseudo Elements.
+ *
+ * This list can be updated with `mach devtools-css-db`.
+ */
+exports.PSEUDO_ELEMENTS = db.PSEUDO_ELEMENTS;
+
+/**
+ * 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 ]
+ *  }
+ */
+exports.CSS_PROPERTIES = db.CSS_PROPERTIES;
+
+exports.CSS_PROPERTIES_DB = {
+  properties: db.CSS_PROPERTIES,
+  pseudoElements: db.PSEUDO_ELEMENTS
+};