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diff --git a/devtools/client/shared/test/browser_mdn-docs-02.js b/devtools/client/shared/test/browser_mdn-docs-02.js
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+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This file tests the MdnDocsWidget object, and specifically its
+ * loadCssDocs() function.
+ *
+ * The MdnDocsWidget is initialized with a document which has a specific
+ * structure. You then call loadCssDocs(), passing in a CSS property name.
+ * MdnDocsWidget then fetches docs for that property by making an XHR to
+ * a docs page, and loads the results into the document.
+ *
+ * In this file we test that the tooltip can properly handle the different
+ * structures that the docs page might have, including variant structures and
+ * error conditions like parts of the document being missing.
+ *
+ * We also test that the tooltip properly handles the case where the page
+ * doesn't exist at all.
+ */
+
+"use strict";
+
+const {
+  setBaseCssDocsUrl,
+  MdnDocsWidget
+} = require("devtools/client/shared/widgets/MdnDocsWidget");
+
+const BASIC_EXPECTED_SUMMARY = "A summary of the property.";
+const BASIC_EXPECTED_SYNTAX = [{type: "comment", text: "/* The part we want   */"},
+                               {type: "text", text: "\n"},
+                               {type: "property-name", text: "this"},
+                               {type: "text", text: ":"},
+                               {type: "text", text: " "},
+                               {type: "property-value", text: "is-the-part-we-want"},
+                               {type: "text", text: ";"}];
+
+const ERROR_MESSAGE = "Could not load docs page.";
+
+/**
+ * Test properties
+ *
+ * In the real tooltip, a CSS property name is used to look up an MDN page
+ * for that property.
+ * In the test code, the names defined here are used to look up a page
+ * served by the test server. We have different properties to test
+ * different ways that the docs pages might be constructed, including errors
+ * like pages that don't include docs where we expect.
+ */
+const SYNTAX_OLD_STYLE = "html-mdn-css-syntax-old-style.html";
+const NO_SUMMARY = "html-mdn-css-no-summary.html";
+const NO_SYNTAX = "html-mdn-css-no-syntax.html";
+const NO_SUMMARY_OR_SYNTAX = "html-mdn-css-no-summary-or-syntax.html";
+
+const TEST_DATA = [{
+  desc: "Test a property for which we don't have a page",
+  docsPageUrl: "i-dont-exist.html",
+  expectedContents: {
+    propertyName: "i-dont-exist.html",
+    summary: ERROR_MESSAGE,
+    syntax: []
+  }
+}, {
+  desc: "Test a property whose syntax section is specified using an old-style page",
+  docsPageUrl: SYNTAX_OLD_STYLE,
+  expectedContents: {
+    propertyName: SYNTAX_OLD_STYLE,
+    summary: BASIC_EXPECTED_SUMMARY,
+    syntax: BASIC_EXPECTED_SYNTAX
+  }
+}, {
+  desc: "Test a property whose page doesn't have a summary",
+  docsPageUrl: NO_SUMMARY,
+  expectedContents: {
+    propertyName: NO_SUMMARY,
+    summary: "",
+    syntax: BASIC_EXPECTED_SYNTAX
+  }
+}, {
+  desc: "Test a property whose page doesn't have a syntax",
+  docsPageUrl: NO_SYNTAX,
+  expectedContents: {
+    propertyName: NO_SYNTAX,
+    summary: BASIC_EXPECTED_SUMMARY,
+    syntax: []
+  }
+}, {
+  desc: "Test a property whose page doesn't have a summary or a syntax",
+  docsPageUrl: NO_SUMMARY_OR_SYNTAX,
+  expectedContents: {
+    propertyName: NO_SUMMARY_OR_SYNTAX,
+    summary: ERROR_MESSAGE,
+    syntax: []
+  }
+}
+];
+
+add_task(function* () {
+  setBaseCssDocsUrl(TEST_URI_ROOT);
+
+  yield addTab("about:blank");
+  let [host, win] = yield createHost("bottom", "data:text/html," +
+    "<div class='mdn-container'></div>");
+  let widget = new MdnDocsWidget(win.document.querySelector("div"));
+
+  for (let {desc, docsPageUrl, expectedContents} of TEST_DATA) {
+    info(desc);
+    yield widget.loadCssDocs(docsPageUrl);
+    checkTooltipContents(widget.elements, expectedContents);
+  }
+  host.destroy();
+  gBrowser.removeCurrentTab();
+});
+
+/*
+ * Utility function to check content of the tooltip.
+ */
+function checkTooltipContents(doc, expected) {
+  is(doc.heading.textContent,
+     expected.propertyName,
+     "Property name is correct");
+
+  is(doc.summary.textContent,
+     expected.summary,
+     "Summary is correct");
+
+  checkCssSyntaxHighlighterOutput(expected.syntax, doc.syntax);
+}