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diff --git a/devtools/server/tests/mochitest/test_styles-modify.html b/devtools/server/tests/mochitest/test_styles-modify.html
new file mode 100644
index 000000000..5a8e20bc3
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+++ b/devtools/server/tests/mochitest/test_styles-modify.html
@@ -0,0 +1,116 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug </title>
+
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">
+  <script type="application/javascript;version=1.8" src="inspector-helpers.js"></script>
+  <script type="application/javascript;version=1.8">
+const inspector = require("devtools/server/actors/inspector");
+const {isCssPropertyKnown} = require("devtools/server/actors/css-properties");
+
+window.onload = function() {
+  SimpleTest.waitForExplicitFinish();
+  runNextTest();
+}
+
+var gWalker = null;
+var gStyles = null;
+var gClient = null;
+
+addAsyncTest(function* setup() {
+  let url = document.getElementById("inspectorContent").href;
+  let inspector;
+
+  yield new Promise(resolve => {
+    attachURL(url, function(err, client, tab, doc) {
+      gInspectee = doc;
+      gClient = client;
+      let {InspectorFront} = require("devtools/shared/fronts/inspector");
+      inspector = InspectorFront(client, tab);
+      resolve();
+    });
+  });
+
+  gWalker = yield inspector.getWalker();
+  gStyles = yield inspector.getPageStyle();
+
+  runNextTest();
+});
+
+addAsyncTest(function* modifyProperties() {
+  let localNode = gInspectee.querySelector("#inheritable-rule-inheritable-style");
+
+  let node = yield gWalker.querySelector(gWalker.rootNode,
+    "#inheritable-rule-inheritable-style");
+
+  let applied = yield gStyles.getApplied(node,
+    { inherited: false, filter: "user" });
+
+  let elementStyle = applied[0].rule;
+  is(elementStyle.cssText, localNode.style.cssText, "Got expected css text");
+
+  // Change an existing property...
+  yield setProperty(elementStyle, 0, "color", "black");
+  // Create a new property
+  yield setProperty(elementStyle, 1, "background-color", "green");
+
+  // Create a new property and then change it immediately.
+  yield setProperty(elementStyle, 2, "border", "1px solid black");
+  yield setProperty(elementStyle, 2, "border", "2px solid black");
+
+  is(elementStyle.cssText,
+     "color: black; background-color: green; border: 2px solid black;",
+     "Should have expected cssText");
+  is(elementStyle.cssText, localNode.style.cssText,
+     "Local node and style front match.");
+
+  // Remove all the properties
+  yield removeProperty(elementStyle, 0, "color");
+  yield removeProperty(elementStyle, 0, "background-color");
+  yield removeProperty(elementStyle, 0, "border");
+
+  is(elementStyle.cssText, "", "Should have expected cssText");
+  is(elementStyle.cssText, localNode.style.cssText,
+     "Local node and style front match.");
+
+  runNextTest();
+});
+
+function* setProperty(rule, index, name, value) {
+  let changes = rule.startModifyingProperties(isCssPropertyKnown);
+  changes.setProperty(index, name, value);
+  yield changes.apply();
+}
+
+function* removeProperty(rule, index, name) {
+  let changes = rule.startModifyingProperties(isCssPropertyKnown);
+  changes.removeProperty(index, name);
+  yield changes.apply();
+}
+
+addTest(function cleanup() {
+  delete gStyles;
+  delete gWalker;
+  delete gClient;
+  runNextTest();
+});
+
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=">Mozilla Bug </a>
+<a id="inspectorContent" target="_blank" href="inspector-styles-data.html">Test Document</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>