diff --git a/devtools/server/actors/css-properties.js b/devtools/server/actors/css-properties.js
index c9ff42b902f8..1f834d68e38e 100644
--- a/devtools/server/actors/css-properties.js
+++ b/devtools/server/actors/css-properties.js
@@ -67,6 +67,7 @@ function generateCssProperties() {
 
   return properties;
 }
+exports.generateCssProperties = generateCssProperties;
 
 /**
  * Test if a CSS is property is known using server-code.
diff --git a/devtools/shared/css-properties-db.js b/devtools/shared/css-properties-db.js
index 47e7b5f398de..eb7f12a6a087 100644
--- a/devtools/shared/css-properties-db.js
+++ b/devtools/shared/css-properties-db.js
@@ -5,7 +5,13 @@
 "use strict";
 
 /**
- * All CSS types that properties can support.
+ * 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.
+ */
+
+/**
+ * All CSS types that properties can support. This list can be manually edited.
  */
 exports.CSS_TYPES = {
   "ANGLE": 1,
@@ -22,12 +28,12 @@ exports.CSS_TYPES = {
 };
 
 /**
- * All cubic-bezier CSS timing-function names.
+ * 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.
+ * Functions that accept a color argument. This list can be manually edited.
  */
 exports.COLOR_TAKING_FUNCTIONS = ["linear-gradient", "-moz-linear-gradient",
                                   "repeating-linear-gradient",
@@ -36,7 +42,7 @@ exports.COLOR_TAKING_FUNCTIONS = ["linear-gradient", "-moz-linear-gradient",
                                   "-moz-repeating-radial-gradient", "drop-shadow"];
 
 /**
- * Functions that accept an angle argument.
+ * Functions that accept an angle argument. This list can be manually edited.
  */
 exports.ANGLE_TAKING_FUNCTIONS = ["linear-gradient", "-moz-linear-gradient",
                                   "repeating-linear-gradient",
@@ -45,1719 +51,51 @@ exports.ANGLE_TAKING_FUNCTIONS = ["linear-gradient", "-moz-linear-gradient",
                                   "skewY", "hue-rotate"];
 
 /**
- * The list of all CSS Pseudo Elements. This list can be generated from:
+ * The list of all CSS Pseudo Elements. This list MUST be automatically generated.
  *
- * let domUtils = Cc["@mozilla.org/inspector/dom-utils;1"].getService(Ci.inIDOMUtils);
- * domUtils.getCSSPseudoElementNames();
+ * The following script will copy the pseudo-elements to your clipboard if run from the
+ * Browser Console, which can be launched from Tools -> Web Developer -> Browser Console.
+
+var domUtils = Cc["@mozilla.org/inspector/dom-utils;1"].getService(Ci.inIDOMUtils);
+var json = JSON.stringify(domUtils.getCSSPseudoElementNames(), null, 0);
+copy(`exports.PSEUDO_ELEMENTS = ${json};\n`);
+console.log("The PSEUDO_ELEMENTS have been copied to your clipboard.")
  */
-exports.PSEUDO_ELEMENTS = [":after", ":before", ":backdrop", ":first-letter",
-                           ":first-line", ":-moz-selection", ":-moz-focus-inner",
-                           ":-moz-focus-outer", ":-moz-list-bullet",
-                           ":-moz-list-number", ":-moz-math-anonymous",
-                           ":-moz-progress-bar", ":-moz-range-track",
-                           ":-moz-range-progress", ":-moz-range-thumb",
-                           ":-moz-meter-bar", ":-moz-placeholder",
-                           ":-moz-color-swatch"];
+
+/*eslint-disable */
+exports.PSEUDO_ELEMENTS = [":after",":before",":backdrop",":first-letter",":first-line",":-moz-selection",":-moz-focus-inner",":-moz-focus-outer",":-moz-list-bullet",":-moz-list-number",":-moz-math-anonymous",":-moz-progress-bar",":-moz-range-track",":-moz-range-progress",":-moz-range-thumb",":-moz-meter-bar",":-moz-placeholder",":-moz-color-swatch"];
+/*eslint-enable */
 
 /**
- * This list is generated from the output of the CssPropertiesActor. If a server
- * does not support the actor, this is loaded as a backup. This list does not
- * guarantee that the server actually supports these CSS properties.
- */
-exports.CSS_PROPERTIES = {
-  "align-content": {
-    isInherited: false,
-    supports: []
-  },
-  "align-items": {
-    isInherited: false,
-    supports: []
-  },
-  "align-self": {
-    isInherited: false,
-    supports: []
-  },
-  "animation-delay": {
-    isInherited: false,
-    supports: [9]
-  },
-  "animation-direction": {
-    isInherited: false,
-    supports: []
-  },
-  "animation-duration": {
-    isInherited: false,
-    supports: [9]
-  },
-  "animation-fill-mode": {
-    isInherited: false,
-    supports: []
-  },
-  "animation-iteration-count": {
-    isInherited: false,
-    supports: [7]
-  },
-  "animation-name": {
-    isInherited: false,
-    supports: []
-  },
-  "animation-play-state": {
-    isInherited: false,
-    supports: []
-  },
-  "animation-timing-function": {
-    isInherited: false,
-    supports: [10]
-  },
-  "-moz-appearance": {
-    isInherited: false,
-    supports: []
-  },
-  "backface-visibility": {
-    isInherited: false,
-    supports: []
-  },
-  "background-attachment": {
-    isInherited: false,
-    supports: []
-  },
-  "background-blend-mode": {
-    isInherited: false,
-    supports: []
-  },
-  "background-clip": {
-    isInherited: false,
-    supports: []
-  },
-  "background-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "background-image": {
-    isInherited: false,
-    supports: [4, 5, 11]
-  },
-  "background-origin": {
-    isInherited: false,
-    supports: []
-  },
-  "background-position-x": {
-    isInherited: false,
-    supports: []
-  },
-  "background-position-y": {
-    isInherited: false,
-    supports: []
-  },
-  "background-repeat": {
-    isInherited: false,
-    supports: []
-  },
-  "background-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "-moz-binding": {
-    isInherited: false,
-    supports: [11]
-  },
-  "block-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "border-block-end-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-block-end-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-block-end-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-block-start-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-block-start-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-block-start-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-bottom-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "-moz-border-bottom-colors": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-bottom-left-radius": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "border-bottom-right-radius": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "border-bottom-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-bottom-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-collapse": {
-    isInherited: true,
-    supports: []
-  },
-  "border-image-outset": {
-    isInherited: false,
-    supports: [6, 7]
-  },
-  "border-image-repeat": {
-    isInherited: false,
-    supports: []
-  },
-  "border-image-slice": {
-    isInherited: false,
-    supports: [7, 8]
-  },
-  "border-image-source": {
-    isInherited: false,
-    supports: [4, 5, 11]
-  },
-  "border-image-width": {
-    isInherited: false,
-    supports: [6, 7, 8]
-  },
-  "border-inline-end-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-inline-end-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-inline-end-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-inline-start-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-inline-start-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-inline-start-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-left-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "-moz-border-left-colors": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-left-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-left-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-right-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "-moz-border-right-colors": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-right-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-right-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "border-spacing": {
-    isInherited: true,
-    supports: [6]
-  },
-  "border-top-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "-moz-border-top-colors": {
-    isInherited: false,
-    supports: [2]
-  },
-  "border-top-left-radius": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "border-top-right-radius": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "border-top-style": {
-    isInherited: false,
-    supports: []
-  },
-  "border-top-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "bottom": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "-moz-box-align": {
-    isInherited: false,
-    supports: []
-  },
-  "box-decoration-break": {
-    isInherited: false,
-    supports: []
-  },
-  "-moz-box-direction": {
-    isInherited: false,
-    supports: []
-  },
-  "-moz-box-flex": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-moz-box-ordinal-group": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-moz-box-orient": {
-    isInherited: false,
-    supports: []
-  },
-  "-moz-box-pack": {
-    isInherited: false,
-    supports: []
-  },
-  "box-shadow": {
-    isInherited: false,
-    supports: [2, 6]
-  },
-  "box-sizing": {
-    isInherited: false,
-    supports: []
-  },
-  "caption-side": {
-    isInherited: true,
-    supports: []
-  },
-  "clear": {
-    isInherited: false,
-    supports: []
-  },
-  "clip": {
-    isInherited: false,
-    supports: []
-  },
-  "clip-path": {
-    isInherited: false,
-    supports: [11]
-  },
-  "clip-rule": {
-    isInherited: true,
-    supports: []
-  },
-  "color": {
-    isInherited: true,
-    supports: [2]
-  },
-  "color-adjust": {
-    isInherited: true,
-    supports: []
-  },
-  "color-interpolation": {
-    isInherited: true,
-    supports: []
-  },
-  "color-interpolation-filters": {
-    isInherited: true,
-    supports: []
-  },
-  "-moz-column-count": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-moz-column-fill": {
-    isInherited: false,
-    supports: []
-  },
-  "-moz-column-gap": {
-    isInherited: false,
-    supports: [6]
-  },
-  "-moz-column-rule-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "-moz-column-rule-style": {
-    isInherited: false,
-    supports: []
-  },
-  "-moz-column-rule-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "-moz-column-width": {
-    isInherited: false,
-    supports: [6]
-  },
-  "content": {
-    isInherited: false,
-    supports: [11]
-  },
-  "-moz-control-character-visibility": {
-    isInherited: true,
-    supports: []
-  },
-  "counter-increment": {
-    isInherited: false,
-    supports: []
-  },
-  "counter-reset": {
-    isInherited: false,
-    supports: []
-  },
-  "cursor": {
-    isInherited: true,
-    supports: [11]
-  },
-  "direction": {
-    isInherited: true,
-    supports: []
-  },
-  "display": {
-    isInherited: false,
-    supports: []
-  },
-  "dominant-baseline": {
-    isInherited: false,
-    supports: []
-  },
-  "empty-cells": {
-    isInherited: true,
-    supports: []
-  },
-  "fill": {
-    isInherited: true,
-    supports: [2, 11]
-  },
-  "fill-opacity": {
-    isInherited: true,
-    supports: [7]
-  },
-  "fill-rule": {
-    isInherited: true,
-    supports: []
-  },
-  "filter": {
-    isInherited: false,
-    supports: [11]
-  },
-  "flex-basis": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "flex-direction": {
-    isInherited: false,
-    supports: []
-  },
-  "flex-grow": {
-    isInherited: false,
-    supports: [7]
-  },
-  "flex-shrink": {
-    isInherited: false,
-    supports: [7]
-  },
-  "flex-wrap": {
-    isInherited: false,
-    supports: []
-  },
-  "float": {
-    isInherited: false,
-    supports: []
-  },
-  "-moz-float-edge": {
-    isInherited: false,
-    supports: []
-  },
-  "flood-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "flood-opacity": {
-    isInherited: false,
-    supports: [7]
-  },
-  "font-family": {
-    isInherited: true,
-    supports: []
-  },
-  "font-feature-settings": {
-    isInherited: true,
-    supports: []
-  },
-  "font-kerning": {
-    isInherited: true,
-    supports: []
-  },
-  "font-language-override": {
-    isInherited: true,
-    supports: []
-  },
-  "font-size": {
-    isInherited: true,
-    supports: [6, 8]
-  },
-  "font-size-adjust": {
-    isInherited: true,
-    supports: [7]
-  },
-  "font-stretch": {
-    isInherited: true,
-    supports: []
-  },
-  "font-style": {
-    isInherited: true,
-    supports: []
-  },
-  "font-synthesis": {
-    isInherited: true,
-    supports: []
-  },
-  "font-variant-alternates": {
-    isInherited: true,
-    supports: []
-  },
-  "font-variant-caps": {
-    isInherited: true,
-    supports: []
-  },
-  "font-variant-east-asian": {
-    isInherited: true,
-    supports: []
-  },
-  "font-variant-ligatures": {
-    isInherited: true,
-    supports: []
-  },
-  "font-variant-numeric": {
-    isInherited: true,
-    supports: []
-  },
-  "font-variant-position": {
-    isInherited: true,
-    supports: []
-  },
-  "font-weight": {
-    isInherited: true,
-    supports: [7]
-  },
-  "-moz-force-broken-image-icon": {
-    isInherited: false,
-    supports: [7]
-  },
-  "grid-auto-columns": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "grid-auto-flow": {
-    isInherited: false,
-    supports: []
-  },
-  "grid-auto-rows": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "grid-column-end": {
-    isInherited: false,
-    supports: [7]
-  },
-  "grid-column-gap": {
-    isInherited: false,
-    supports: [6]
-  },
-  "grid-column-start": {
-    isInherited: false,
-    supports: [7]
-  },
-  "grid-row-end": {
-    isInherited: false,
-    supports: [7]
-  },
-  "grid-row-gap": {
-    isInherited: false,
-    supports: [6]
-  },
-  "grid-row-start": {
-    isInherited: false,
-    supports: [7]
-  },
-  "grid-template-areas": {
-    isInherited: false,
-    supports: []
-  },
-  "grid-template-columns": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "grid-template-rows": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "height": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "hyphens": {
-    isInherited: true,
-    supports: []
-  },
-  "image-orientation": {
-    isInherited: true,
-    supports: [1]
-  },
-  "-moz-image-region": {
-    isInherited: true,
-    supports: []
-  },
-  "image-rendering": {
-    isInherited: true,
-    supports: []
-  },
-  "ime-mode": {
-    isInherited: false,
-    supports: []
-  },
-  "inline-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "isolation": {
-    isInherited: false,
-    supports: []
-  },
-  "justify-content": {
-    isInherited: false,
-    supports: []
-  },
-  "justify-items": {
-    isInherited: false,
-    supports: []
-  },
-  "justify-self": {
-    isInherited: false,
-    supports: []
-  },
-  "left": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "letter-spacing": {
-    isInherited: true,
-    supports: [6]
-  },
-  "lighting-color": {
-    isInherited: false,
-    supports: [2]
-  },
-  "line-height": {
-    isInherited: true,
-    supports: [6, 7, 8]
-  },
-  "list-style-image": {
-    isInherited: true,
-    supports: [11]
-  },
-  "list-style-position": {
-    isInherited: true,
-    supports: []
-  },
-  "list-style-type": {
-    isInherited: true,
-    supports: []
-  },
-  "margin-block-end": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-block-start": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-bottom": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-inline-end": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-inline-start": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-left": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-right": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "margin-top": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "marker-end": {
-    isInherited: true,
-    supports: [11]
-  },
-  "marker-mid": {
-    isInherited: true,
-    supports: [11]
-  },
-  "marker-offset": {
-    isInherited: false,
-    supports: [6]
-  },
-  "marker-start": {
-    isInherited: true,
-    supports: [11]
-  },
-  "mask": {
-    isInherited: false,
-    supports: [11]
-  },
-  "mask-type": {
-    isInherited: false,
-    supports: []
-  },
-  "max-block-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "max-height": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "max-inline-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "max-width": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "min-block-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "min-height": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "min-inline-size": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "min-width": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "mix-blend-mode": {
-    isInherited: false,
-    supports: []
-  },
-  "object-fit": {
-    isInherited: false,
-    supports: []
-  },
-  "object-position": {
-    isInherited: false,
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-    isInherited: false,
-    supports: [4, 5, 6, 7, 8, 11]
-  },
-  "-webkit-box-shadow": {
-    isInherited: false,
-    supports: [2, 6]
-  },
-  "-webkit-box-sizing": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-box-flex": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-webkit-box-ordinal-group": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-webkit-box-orient": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-box-direction": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-box-align": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-box-pack": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-flex-direction": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-flex-wrap": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-flex-flow": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-order": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-webkit-flex": {
-    isInherited: false,
-    supports: [6, 7, 8]
-  },
-  "-webkit-flex-grow": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-webkit-flex-shrink": {
-    isInherited: false,
-    supports: [7]
-  },
-  "-webkit-flex-basis": {
-    isInherited: false,
-    supports: [6, 8]
-  },
-  "-webkit-justify-content": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-align-items": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-align-self": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-align-content": {
-    isInherited: false,
-    supports: []
-  },
-  "-webkit-user-select": {
-    isInherited: false,
-    supports: []
+ * 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 ]
+ *  }
+ *
+ * The following script will copy the CSS properties to your clipboard if run from the
+ * Browser Console, which can be launched from Tools -> Web Developer -> Browser Console.
+
+var {require} = Components.utils.import("resource://devtools/shared/Loader.jsm", {});
+var {generateCssProperties} = require("devtools/server/actors/css-properties");
+var cssProperties = generateCssProperties();
+for (var key in cssProperties) {
+  // Ignore OS-specific properties
+  if (key.indexOf('-moz-osx-') !== -1) {
+    cssProperties[key] = undefined;
   }
-};
+}
+var json = JSON.stringify(cssProperties, null, 0);
+copy(`exports.CSS_PROPERTIES = ${json};\n`);
+console.log("The CSS_PROPERTIES have been copied to your clipboard.");
+ */
+
+/*eslint-disable */
+exports.CSS_PROPERTIES = 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+/*eslint-enable */
 
 exports.CSS_PROPERTIES_DB = {
   properties: exports.CSS_PROPERTIES,
diff --git a/devtools/shared/tests/unit/test_css-properties-db.js b/devtools/shared/tests/unit/test_css-properties-db.js
index 519fc57fc9ff..10ad2358a4fb 100644
--- a/devtools/shared/tests/unit/test_css-properties-db.js
+++ b/devtools/shared/tests/unit/test_css-properties-db.js
@@ -1,36 +1,48 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
-// Test that css-properties-db matches platform.
+// Test that the devtool's client-side css-properties-db matches the values on the
+// platform.
 
 "use strict";
 
 const DOMUtils = Components.classes["@mozilla.org/inspector/dom-utils;1"]
                            .getService(Components.interfaces.inIDOMUtils);
 
-const {PSEUDO_ELEMENTS} = require("devtools/shared/css-properties-db");
+const {PSEUDO_ELEMENTS, CSS_PROPERTIES} = require("devtools/shared/css-properties-db");
+const {generateCssProperties} = require("devtools/server/actors/css-properties");
 
 function run_test() {
   // Check that the platform and client match for pseudo elements.
-  let foundPseudoElements = 0;
-  const platformPseudoElements = DOMUtils.getCSSPseudoElementNames();
-  const instructions = "If this assertion fails then it means that pseudo elements " +
-                       "have been added, removed, or changed on the platform and need " +
-                       "to be updated on the static client-side list of pseudo " +
-                       "elements within the devtools. " +
-                       "See devtools/shared/css-properties-db.js and " +
-                       "exports.PSEUDO_ELEMENTS for information on how to update the " +
-                       "list of pseudo elements to fix this test.";
+  deepEqual(PSEUDO_ELEMENTS, DOMUtils.getCSSPseudoElementNames(),
+            "If this assertion fails, then the client side CSS pseudo elements list in " +
+            "devtools is out of date with the pseudo elements on the platform. To fix " +
+            "this assertion open devtools/shared/css-properties-db.js and follow the " +
+            "instructions above the CSS_PSEUDO_ELEMENTS on how to re-generate the list.");
 
-  for (let element of PSEUDO_ELEMENTS) {
-    const hasElement = platformPseudoElements.includes(element);
-    ok(hasElement,
-       `"${element}" pseudo element from the client-side CSS properties database was ` +
-       `found on the platform. ${instructions}`);
-    foundPseudoElements += hasElement ? 1 : 0;
+  const propertiesErrorMessage = "If this assertion fails, then the client side CSS " +
+                                 "properties list in devtools is out of date with the " +
+                                 "CSS properties on the platform. To fix this " +
+                                 "assertion open devtools/shared/css-properties-db.js " +
+                                 "and follow the instructions above the CSS_PROPERTIES " +
+                                 "on how to re-generate the list.";
+
+  // Check that the platform and client match for CSS properties. Enumerate each property
+  // to aid in debugging.
+  const platformProperties = generateCssProperties();
+  for (let propertyName in CSS_PROPERTIES) {
+    const platformProperty = platformProperties[propertyName];
+    const clientProperty = CSS_PROPERTIES[propertyName];
+    deepEqual(platformProperty, clientProperty,
+      `Client and server match for "${propertyName}". ${propertiesErrorMessage}\n`);
   }
 
-  equal(foundPseudoElements, platformPseudoElements.length,
-        `The client side CSS properties database of psuedo element names should match ` +
-        `those found on the platform. ${instructions}`);
+  // Filter out OS-specific properties.
+  const platformPropertyNames = Object.keys(platformProperties).filter(
+    name => name.indexOf("-moz-osx-") === -1);
+  const clientPlatformNames = Object.keys(CSS_PROPERTIES);
+
+  deepEqual(platformPropertyNames, clientPlatformNames,
+        `The client side CSS properties database names match those found on the ` +
+        `platform. ${propertiesErrorMessage}`);
 }