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diff --git a/devtools/client/shared/test/browser_mdn-docs-01.js b/devtools/client/shared/test/browser_mdn-docs-01.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. While the XHR is
+ * still not resolved the document is put into an "initializing" state in
+ * which the devtools throbber is displayed.
+ *
+ * In this file we test:
+ * - the initial state of the document before the docs have loaded
+ * - the state of the document after the docs have loaded
+ */
+
+"use strict";
+
+const {setBaseCssDocsUrl, MdnDocsWidget} = require("devtools/client/shared/widgets/MdnDocsWidget");
+
+/**
+ * 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 is used to look up a page
+ * served by the test server.
+ */
+const BASIC_TESTING_PROPERTY = "html-mdn-css-basic-testing.html";
+
+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 URI_PARAMS =
+  "?utm_source=mozilla&utm_medium=firefox-inspector&utm_campaign=default";
+
+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"));
+
+  yield testTheBasics(widget);
+
+  host.destroy();
+  gBrowser.removeCurrentTab();
+});
+
+/**
+ * Test all the basics
+ * - initial content, before docs have loaded, is as expected
+ * - throbber is set before docs have loaded
+ * - contents are as expected after docs have loaded
+ * - throbber is gone after docs have loaded
+ * - mdn link text is correct and onclick behavior is correct
+ */
+function* testTheBasics(widget) {
+  info("Test all the basic functionality in the widget");
+
+  info("Get the widget state before docs have loaded");
+  let promise = widget.loadCssDocs(BASIC_TESTING_PROPERTY);
+
+  info("Check initial contents before docs have loaded");
+  checkTooltipContents(widget.elements, {
+    propertyName: BASIC_TESTING_PROPERTY,
+    summary: "",
+    syntax: ""
+  });
+
+  // throbber is set
+  ok(widget.elements.info.classList.contains("devtools-throbber"),
+     "Throbber is set");
+
+  info("Now let the widget finish loading");
+  yield promise;
+
+  info("Check contents after docs have loaded");
+  checkTooltipContents(widget.elements, {
+    propertyName: BASIC_TESTING_PROPERTY,
+    summary: BASIC_EXPECTED_SUMMARY,
+    syntax: BASIC_EXPECTED_SYNTAX
+  });
+
+  // throbber is gone
+  ok(!widget.elements.info.classList.contains("devtools-throbber"),
+     "Throbber is not set");
+
+  info("Check that MDN link text is correct and onclick behavior is correct");
+
+  let mdnLink = widget.elements.linkToMdn;
+  let expectedHref = TEST_URI_ROOT + BASIC_TESTING_PROPERTY + URI_PARAMS;
+  is(mdnLink.href, expectedHref, "MDN link href is correct");
+
+  let uri = yield checkLinkClick(mdnLink);
+  is(uri, expectedHref, "New tab opened with the expected URI");
+}
+
+ /**
+  * Clicking the "Visit MDN Page" in the tooltip panel
+  * should open a new browser tab with the page loaded.
+  *
+  * To test this we'll listen for a new tab opening, and
+  * when it does, add a listener to that new tab to tell
+  * us when it has loaded.
+  *
+  * Then we click the link.
+  *
+  * In the tab's load listener, we'll resolve the promise
+  * with the URI, which is expected to match the href
+  * in the orginal link.
+  *
+  * One complexity is that when you open a new tab,
+  * "about:blank" is first loaded into the tab before the
+  * actual page. So we ignore that first load event, and keep
+  * listening until "load" is triggered for a different URI.
+  */
+function checkLinkClick(link) {
+  function loadListener(tab) {
+    let browser = getBrowser().getBrowserForTab(tab);
+    let uri = browser.currentURI.spec;
+
+    info("New browser tab has loaded");
+    gBrowser.removeTab(tab);
+    info("Resolve promise with new tab URI");
+    deferred.resolve(uri);
+  }
+
+  function newTabListener(e) {
+    gBrowser.tabContainer.removeEventListener("TabOpen", newTabListener);
+    let tab = e.target;
+    BrowserTestUtils.browserLoaded(tab.linkedBrowser, false, url => url != "about:blank")
+      .then(url => loadListener(tab));
+  }
+
+  let deferred = defer();
+  info("Check that clicking the link opens a new tab with the correct URI");
+  gBrowser.tabContainer.addEventListener("TabOpen", newTabListener, false);
+  info("Click the link to MDN");
+  link.click();
+  return deferred.promise;
+}
+
+/**
+ * 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);
+}