Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

12 files changed, 799 insertions, 0 deletions

diff --git a/toolkit/components/tooltiptext/TooltipTextProvider.sys.mjs b/toolkit/components/tooltiptext/TooltipTextProvider.sys.mjs
new file mode 100644
index 0000000000..0ddd594cb6
--- /dev/null
+++ b/toolkit/components/tooltiptext/TooltipTextProvider.sys.mjs
@@ -0,0 +1,172 @@
+/* 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/. */
+
+export function TooltipTextProvider() {}
+
+TooltipTextProvider.prototype = {
+  getNodeText(tipElement, textOut, directionOut) {
+    // Don't show the tooltip if the tooltip node is a document or browser.
+    // Caller should ensure the node is in (composed) document.
+    if (
+      !tipElement ||
+      !tipElement.ownerDocument ||
+      tipElement.localName == "browser"
+    ) {
+      return false;
+    }
+
+    var defView = tipElement.ownerGlobal;
+    // XXX Work around bug 350679:
+    // "Tooltips can be fired in documents with no view".
+    if (!defView) {
+      return false;
+    }
+
+    const XLinkNS = "http://www.w3.org/1999/xlink";
+    const XUL_NS =
+      "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+    var titleText = null;
+    var XLinkTitleText = null;
+    var SVGTitleText = null;
+    var XULtooltiptextText = null;
+    var lookingForSVGTitle = true;
+    var direction = tipElement.ownerDocument.dir;
+
+    // If the element is invalid per HTML5 Forms specifications and has no title,
+    // show the constraint validation error message.
+    if (
+      (defView.HTMLInputElement.isInstance(tipElement) ||
+        defView.HTMLTextAreaElement.isInstance(tipElement) ||
+        defView.HTMLSelectElement.isInstance(tipElement) ||
+        defView.HTMLButtonElement.isInstance(tipElement)) &&
+      !tipElement.hasAttribute("title") &&
+      (!tipElement.form || !tipElement.form.noValidate)
+    ) {
+      // If the element is barred from constraint validation or valid,
+      // the validation message will be the empty string.
+      titleText = tipElement.validationMessage || null;
+    }
+
+    // If the element is an <input type='file'> without a title, we should show
+    // the current file selection.
+    if (
+      !titleText &&
+      defView.HTMLInputElement.isInstance(tipElement) &&
+      tipElement.type == "file" &&
+      !tipElement.hasAttribute("title")
+    ) {
+      let files = tipElement.files;
+
+      try {
+        var bundle = Services.strings.createBundle(
+          "chrome://global/locale/layout/HtmlForm.properties"
+        );
+        if (!files.length) {
+          if (tipElement.multiple) {
+            titleText = bundle.GetStringFromName("NoFilesSelected");
+          } else {
+            titleText = bundle.GetStringFromName("NoFileSelected");
+          }
+        } else {
+          titleText = files[0].name;
+          // For UX and performance (jank) reasons we cap the number of
+          // files that we list in the tooltip to 20 plus a "and xxx more"
+          // line, or to 21 if exactly 21 files were picked.
+          const TRUNCATED_FILE_COUNT = 20;
+          let count = Math.min(files.length, TRUNCATED_FILE_COUNT);
+          for (let i = 1; i < count; ++i) {
+            titleText += "\n" + files[i].name;
+          }
+          if (files.length == TRUNCATED_FILE_COUNT + 1) {
+            titleText += "\n" + files[TRUNCATED_FILE_COUNT].name;
+          } else if (files.length > TRUNCATED_FILE_COUNT + 1) {
+            const l10n = new Localization(
+              ["toolkit/global/htmlForm.ftl"],
+              true
+            );
+            const andXMoreStr = l10n.formatValueSync(
+              "input-file-and-more-files",
+              { fileCount: files.length - TRUNCATED_FILE_COUNT }
+            );
+            titleText += "\n" + andXMoreStr;
+          }
+        }
+      } catch (e) {}
+    }
+
+    // Check texts against null so that title="" can be used to undefine a
+    // title on a child element.
+    let usedTipElement = null;
+    while (
+      tipElement &&
+      titleText == null &&
+      XLinkTitleText == null &&
+      SVGTitleText == null &&
+      XULtooltiptextText == null
+    ) {
+      if (tipElement.nodeType == defView.Node.ELEMENT_NODE) {
+        if (tipElement.namespaceURI == XUL_NS) {
+          XULtooltiptextText = tipElement.hasAttribute("tooltiptext")
+            ? tipElement.getAttribute("tooltiptext")
+            : null;
+        } else if (!defView.SVGElement.isInstance(tipElement)) {
+          titleText = tipElement.getAttribute("title");
+        }
+
+        if (
+          (defView.HTMLAnchorElement.isInstance(tipElement) ||
+            defView.HTMLAreaElement.isInstance(tipElement) ||
+            defView.HTMLLinkElement.isInstance(tipElement) ||
+            defView.SVGAElement.isInstance(tipElement)) &&
+          tipElement.href
+        ) {
+          XLinkTitleText = tipElement.getAttributeNS(XLinkNS, "title");
+        }
+        if (
+          lookingForSVGTitle &&
+          (!defView.SVGElement.isInstance(tipElement) ||
+            tipElement.parentNode.nodeType == defView.Node.DOCUMENT_NODE)
+        ) {
+          lookingForSVGTitle = false;
+        }
+        if (lookingForSVGTitle) {
+          for (let childNode of tipElement.childNodes) {
+            if (defView.SVGTitleElement.isInstance(childNode)) {
+              SVGTitleText = childNode.textContent;
+              break;
+            }
+          }
+        }
+
+        usedTipElement = tipElement;
+      }
+
+      tipElement = tipElement.flattenedTreeParentNode;
+    }
+
+    return [titleText, XLinkTitleText, SVGTitleText, XULtooltiptextText].some(
+      function (t) {
+        if (t && /\S/.test(t)) {
+          // Make CRLF and CR render one line break each.
+          textOut.value = t.replace(/\r\n?/g, "\n");
+
+          if (usedTipElement) {
+            direction = defView
+              .getComputedStyle(usedTipElement)
+              .getPropertyValue("direction");
+          }
+
+          directionOut.value = direction;
+          return true;
+        }
+
+        return false;
+      }
+    );
+  },
+
+  classID: Components.ID("{f376627f-0bbc-47b8-887e-fc92574cc91f}"),
+  QueryInterface: ChromeUtils.generateQI(["nsITooltipTextProvider"]),
+};
diff --git a/toolkit/components/tooltiptext/components.conf b/toolkit/components/tooltiptext/components.conf
new file mode 100644
index 0000000000..3f2e6b17d3
--- /dev/null
+++ b/toolkit/components/tooltiptext/components.conf
@@ -0,0 +1,14 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+Classes = [
+    {
+        'cid': '{f376627f-0bbc-47b8-887e-fc92574cc91f}',
+        'contract_ids': ['@mozilla.org/embedcomp/default-tooltiptextprovider;1'],
+        'esModule': 'resource://gre/modules/TooltipTextProvider.sys.mjs',
+        'constructor': 'TooltipTextProvider',
+    },
+]
diff --git a/toolkit/components/tooltiptext/moz.build b/toolkit/components/tooltiptext/moz.build
new file mode 100644
index 0000000000..020ec8d989
--- /dev/null
+++ b/toolkit/components/tooltiptext/moz.build
@@ -0,0 +1,18 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+BROWSER_CHROME_MANIFESTS += ["tests/browser.ini"]
+
+EXTRA_JS_MODULES += [
+    "TooltipTextProvider.sys.mjs",
+]
+
+XPCOM_MANIFESTS += [
+    "components.conf",
+]
+
+with Files("**"):
+    BUG_COMPONENT = ("Toolkit", "General")
diff --git a/toolkit/components/tooltiptext/tests/browser.ini b/toolkit/components/tooltiptext/tests/browser.ini
new file mode 100644
index 0000000000..2c2fcea29c
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser.ini
@@ -0,0 +1,9 @@
+[browser_bug329212.js]
+support-files = title_test.svg
+[browser_bug331772_xul_tooltiptext_in_html.js]
+support-files = xul_tooltiptext.xhtml
+[browser_bug561623.js]
+[browser_bug581947.js]
+[browser_input_file_tooltips.js]
+skip-if = os == 'win' && os_version == '10.0'  # Permafail on Win 10 (bug 1400368)
+[browser_shadow_dom_tooltip.js]
diff --git a/toolkit/components/tooltiptext/tests/browser_bug329212.js b/toolkit/components/tooltiptext/tests/browser_bug329212.js
new file mode 100644
index 0000000000..d669e60c26
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser_bug329212.js
@@ -0,0 +1,48 @@
+"use strict";
+
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "http://mochi.test:8888/browser/toolkit/components/tooltiptext/tests/title_test.svg",
+    },
+    async function (browser) {
+      await SpecialPowers.spawn(browser, [""], function () {
+        let tttp = Cc[
+          "@mozilla.org/embedcomp/default-tooltiptextprovider;1"
+        ].getService(Ci.nsITooltipTextProvider);
+        function checkElement(id, expectedTooltipText) {
+          let el = content.document.getElementById(id);
+          let textObj = {};
+          let shouldHaveTooltip = expectedTooltipText !== null;
+          is(
+            tttp.getNodeText(el, textObj, {}),
+            shouldHaveTooltip,
+            "element " +
+              id +
+              " should " +
+              (shouldHaveTooltip ? "" : "not ") +
+              "have a tooltip"
+          );
+          if (shouldHaveTooltip) {
+            is(
+              textObj.value,
+              expectedTooltipText,
+              "element " + id + " should have the right tooltip text"
+            );
+          }
+        }
+        checkElement("svg1", "This is a non-root SVG element title");
+        checkElement("text1", "\n\n\n    This            is a title\n\n    ");
+        checkElement("text2", null);
+        checkElement("text3", null);
+        checkElement("link1", "\n      This is a title\n    ");
+        checkElement("text4", "\n      This is a title\n    ");
+        checkElement("link2", null);
+        checkElement("link3", "This is an xlink:title attribute");
+        checkElement("link4", "This is an xlink:title attribute");
+        checkElement("text5", null);
+      });
+    }
+  );
+});
diff --git a/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js b/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js
new file mode 100644
index 0000000000..61c50e5422
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser_bug331772_xul_tooltiptext_in_html.js
@@ -0,0 +1,30 @@
+/**
+ * Tests that the tooltiptext attribute is used for XUL elements in an HTML doc.
+ */
+add_task(async function () {
+  await SpecialPowers.pushPermissions([
+    { type: "allowXULXBL", allow: true, context: "http://mochi.test:8888" },
+  ]);
+
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "http://mochi.test:8888/browser/toolkit/components/tooltiptext/tests/xul_tooltiptext.xhtml",
+    },
+    async function (browser) {
+      await SpecialPowers.spawn(browser, [""], function () {
+        let textObj = {};
+        let tttp = Cc[
+          "@mozilla.org/embedcomp/default-tooltiptextprovider;1"
+        ].getService(Ci.nsITooltipTextProvider);
+        let xulToolbarButton =
+          content.document.getElementById("xulToolbarButton");
+        ok(
+          tttp.getNodeText(xulToolbarButton, textObj, {}),
+          "should get tooltiptext"
+        );
+        is(textObj.value, "XUL tooltiptext");
+      });
+    }
+  );
+});
diff --git a/toolkit/components/tooltiptext/tests/browser_bug561623.js b/toolkit/components/tooltiptext/tests/browser_bug561623.js
new file mode 100644
index 0000000000..93f68d307f
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser_bug561623.js
@@ -0,0 +1,33 @@
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "data:text/html,<!DOCTYPE html><html><body><input id='i'></body></html>",
+    },
+    async function (browser) {
+      await SpecialPowers.spawn(browser, [""], function () {
+        let tttp = Cc[
+          "@mozilla.org/embedcomp/default-tooltiptextprovider;1"
+        ].getService(Ci.nsITooltipTextProvider);
+        let i = content.document.getElementById("i");
+
+        ok(
+          !tttp.getNodeText(i, {}, {}),
+          "No tooltip should be shown when @title is null"
+        );
+
+        i.title = "foo";
+        ok(
+          tttp.getNodeText(i, {}, {}),
+          "A tooltip should be shown when @title is not the empty string"
+        );
+
+        i.pattern = "bar";
+        ok(
+          tttp.getNodeText(i, {}, {}),
+          "A tooltip should be shown when @title is not the empty string"
+        );
+      });
+    }
+  );
+});
diff --git a/toolkit/components/tooltiptext/tests/browser_bug581947.js b/toolkit/components/tooltiptext/tests/browser_bug581947.js
new file mode 100644
index 0000000000..6e5eb9ea14
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser_bug581947.js
@@ -0,0 +1,107 @@
+function check(aBrowser, aElementName, aBarred, aType) {
+  return SpecialPowers.spawn(
+    aBrowser,
+    [[aElementName, aBarred, aType]],
+    async function ([aElementName, aBarred, aType]) {
+      let e = content.document.createElement(aElementName);
+      let contentElement = content.document.getElementById("content");
+      contentElement.appendChild(e);
+
+      if (aType) {
+        e.type = aType;
+      }
+
+      let tttp = Cc[
+        "@mozilla.org/embedcomp/default-tooltiptextprovider;1"
+      ].getService(Ci.nsITooltipTextProvider);
+      ok(
+        !tttp.getNodeText(e, {}, {}),
+        "No tooltip should be shown when the element is valid"
+      );
+
+      e.setCustomValidity("foo");
+      if (aBarred) {
+        ok(
+          !tttp.getNodeText(e, {}, {}),
+          "No tooltip should be shown when the element is barred from constraint validation"
+        );
+      } else {
+        ok(
+          tttp.getNodeText(e, {}, {}),
+          e.tagName + " A tooltip should be shown when the element isn't valid"
+        );
+      }
+
+      e.setAttribute("title", "");
+      ok(
+        !tttp.getNodeText(e, {}, {}),
+        "No tooltip should be shown if the title attribute is set"
+      );
+
+      e.removeAttribute("title");
+      contentElement.setAttribute("novalidate", "");
+      ok(
+        !tttp.getNodeText(e, {}, {}),
+        "No tooltip should be shown if the novalidate attribute is set on the form owner"
+      );
+      contentElement.removeAttribute("novalidate");
+
+      e.remove();
+    }
+  );
+}
+
+function todo_check(aBrowser, aElementName, aBarred) {
+  return SpecialPowers.spawn(
+    aBrowser,
+    [[aElementName, aBarred]],
+    async function ([aElementName, aBarred]) {
+      let e = content.document.createElement(aElementName);
+      let contentElement = content.document.getElementById("content");
+      contentElement.appendChild(e);
+
+      let caught = false;
+      try {
+        e.setCustomValidity("foo");
+      } catch (e) {
+        caught = true;
+      }
+
+      todo(!caught, "setCustomValidity should exist for " + aElementName);
+
+      e.remove();
+    }
+  );
+}
+
+add_task(async function () {
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: "data:text/html,<!DOCTYPE html><html><body><form id='content'></form></body></html>",
+    },
+    async function (browser) {
+      let testData = [
+        /* element name, barred */
+        ["input", false, null],
+        ["textarea", false, null],
+        ["button", true, "button"],
+        ["button", false, "submit"],
+        ["select", false, null],
+        ["output", true, null],
+        ["fieldset", true, null],
+        ["object", true, null],
+      ];
+
+      for (let data of testData) {
+        await check(browser, data[0], data[1], data[2]);
+      }
+
+      let todo_testData = [["keygen", "false"]];
+
+      for (let data of todo_testData) {
+        await todo_check(browser, data[0], data[1]);
+      }
+    }
+  );
+});
diff --git a/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js b/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js
new file mode 100644
index 0000000000..71848e07bb
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js
@@ -0,0 +1,131 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+
+let tempFile;
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({ set: [["ui.tooltipDelay", 0]] });
+  tempFile = createTempFile();
+  registerCleanupFunction(function () {
+    tempFile.remove(true);
+  });
+});
+
+add_task(async function test_singlefile_selected() {
+  await do_test({ value: true, result: "testfile_bug1251809" });
+});
+
+add_task(async function test_title_set() {
+  await do_test({ title: "foo", result: "foo" });
+});
+
+add_task(async function test_nofile_selected() {
+  await do_test({ result: "No file selected." });
+});
+
+add_task(async function test_multipleset_nofile_selected() {
+  await do_test({ multiple: true, result: "No files selected." });
+});
+
+add_task(async function test_requiredset() {
+  await do_test({ required: true, result: "Please select a file." });
+});
+
+async function do_test(test) {
+  info(`starting test ${JSON.stringify(test)}`);
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  info("Moving mouse out of the way.");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(
+    tab.linkedBrowser,
+    300,
+    300
+  );
+
+  info("creating input field");
+  await SpecialPowers.spawn(tab.linkedBrowser, [test], async function (test) {
+    let doc = content.document;
+    let input = doc.createElement("input");
+    doc.body.appendChild(input);
+    input.id = "test_input";
+    input.setAttribute("style", "position: absolute; top: 0; left: 0;");
+    input.type = "file";
+    if (test.title) {
+      input.setAttribute("title", test.title);
+    }
+    if (test.multiple) {
+      input.multiple = true;
+    }
+    if (test.required) {
+      input.required = true;
+    }
+  });
+
+  if (test.value) {
+    info("Creating mock filepicker to select files");
+    let MockFilePicker = SpecialPowers.MockFilePicker;
+    MockFilePicker.init(window);
+    MockFilePicker.returnValue = MockFilePicker.returnOK;
+    MockFilePicker.displayDirectory = FileUtils.getDir("TmpD", [], false);
+    MockFilePicker.setFiles([tempFile]);
+    MockFilePicker.afterOpenCallback = MockFilePicker.cleanup;
+
+    try {
+      // Open the File Picker dialog (MockFilePicker) to select
+      // the files for the test.
+      await BrowserTestUtils.synthesizeMouseAtCenter(
+        "#test_input",
+        {},
+        tab.linkedBrowser
+      );
+      info("Waiting for the input to have the requisite files");
+      await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+        let input = content.document.querySelector("#test_input");
+        await ContentTaskUtils.waitForCondition(
+          () => input.files.length,
+          "The input should have at least one file selected"
+        );
+        info(`The input has ${input.files.length} file(s) selected.`);
+      });
+    } catch (e) {}
+  } else {
+    info("No real file selection required.");
+  }
+
+  let awaitTooltipOpen = new Promise(resolve => {
+    let tooltipId = Services.appinfo.browserTabsRemoteAutostart
+      ? "remoteBrowserTooltip"
+      : "aHTMLTooltip";
+    let tooltip = document.getElementById(tooltipId);
+    tooltip.addEventListener(
+      "popupshown",
+      function (event) {
+        resolve(event.target);
+      },
+      { once: true }
+    );
+  });
+  info("Initial mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 50, 5);
+  info("Waiting");
+  await new Promise(resolve => setTimeout(resolve, 400));
+  info("Second mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 70, 5);
+  info("Waiting for tooltip to open");
+  let tooltip = await awaitTooltipOpen;
+
+  is(
+    tooltip.getAttribute("label"),
+    test.result,
+    "tooltip label should match expectation"
+  );
+
+  info("Closing tab");
+  BrowserTestUtils.removeTab(tab);
+}
+
+function createTempFile() {
+  let file = FileUtils.getDir("TmpD", [], false);
+  file.append("testfile_bug1251809");
+  file.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o644);
+  return file;
+}
diff --git a/toolkit/components/tooltiptext/tests/browser_shadow_dom_tooltip.js b/toolkit/components/tooltiptext/tests/browser_shadow_dom_tooltip.js
new file mode 100644
index 0000000000..50386e07e2
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/browser_shadow_dom_tooltip.js
@@ -0,0 +1,166 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
+
+add_setup(async function () {
+  await SpecialPowers.pushPrefEnv({ set: [["ui.tooltipDelay", 0]] });
+});
+
+add_task(async function test_title_in_shadow_dom() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  info("Moving mouse out of the way.");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(
+    tab.linkedBrowser,
+    300,
+    300
+  );
+
+  info("creating host");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    let doc = content.document;
+    let host = doc.createElement("div");
+    doc.body.appendChild(host);
+    host.setAttribute("style", "position: absolute; top: 0; left: 0;");
+    var sr = host.attachShadow({ mode: "closed" });
+    sr.innerHTML =
+      "<div title='shadow' style='width: 200px; height: 200px;'>shadow</div>";
+  });
+
+  let awaitTooltipOpen = new Promise(resolve => {
+    let tooltipId = Services.appinfo.browserTabsRemoteAutostart
+      ? "remoteBrowserTooltip"
+      : "aHTMLTooltip";
+    let tooltip = document.getElementById(tooltipId);
+    tooltip.addEventListener(
+      "popupshown",
+      function (event) {
+        resolve(event.target);
+      },
+      { once: true }
+    );
+  });
+  info("Initial mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 50, 5);
+  info("Waiting");
+  await new Promise(resolve => setTimeout(resolve, 400));
+  info("Second mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 70, 5);
+  info("Waiting for tooltip to open");
+  let tooltip = await awaitTooltipOpen;
+
+  is(
+    tooltip.getAttribute("label"),
+    "shadow",
+    "tooltip label should match expectation"
+  );
+
+  info("Closing tab");
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_title_in_light_dom() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  info("Moving mouse out of the way.");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(
+    tab.linkedBrowser,
+    300,
+    300
+  );
+
+  info("creating host");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    let doc = content.document;
+    let host = doc.createElement("div");
+    host.title = "light";
+    doc.body.appendChild(host);
+    host.setAttribute("style", "position: absolute; top: 0; left: 0;");
+    var sr = host.attachShadow({ mode: "closed" });
+    sr.innerHTML = "<div style='width: 200px; height: 200px;'>shadow</div>";
+  });
+
+  let awaitTooltipOpen = new Promise(resolve => {
+    let tooltipId = Services.appinfo.browserTabsRemoteAutostart
+      ? "remoteBrowserTooltip"
+      : "aHTMLTooltip";
+    let tooltip = document.getElementById(tooltipId);
+    tooltip.addEventListener(
+      "popupshown",
+      function (event) {
+        resolve(event.target);
+      },
+      { once: true }
+    );
+  });
+  info("Initial mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 50, 5);
+  info("Waiting");
+  await new Promise(resolve => setTimeout(resolve, 400));
+  info("Second mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 70, 5);
+  info("Waiting for tooltip to open");
+  let tooltip = await awaitTooltipOpen;
+
+  is(
+    tooltip.getAttribute("label"),
+    "light",
+    "tooltip label should match expectation"
+  );
+
+  info("Closing tab");
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_title_through_slot() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
+
+  info("Moving mouse out of the way.");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(
+    tab.linkedBrowser,
+    300,
+    300
+  );
+
+  info("creating host");
+  await SpecialPowers.spawn(tab.linkedBrowser, [], async function () {
+    let doc = content.document;
+    let host = doc.createElement("div");
+    host.title = "light";
+    host.innerHTML = "<div style='width: 200px; height: 200px;'>light</div>";
+    doc.body.appendChild(host);
+    host.setAttribute("style", "position: absolute; top: 0; left: 0;");
+    var sr = host.attachShadow({ mode: "closed" });
+    sr.innerHTML =
+      "<div title='shadow' style='width: 200px; height: 200px;'><slot></slot></div>";
+  });
+
+  let awaitTooltipOpen = new Promise(resolve => {
+    let tooltipId = Services.appinfo.browserTabsRemoteAutostart
+      ? "remoteBrowserTooltip"
+      : "aHTMLTooltip";
+    let tooltip = document.getElementById(tooltipId);
+    tooltip.addEventListener(
+      "popupshown",
+      function (event) {
+        resolve(event.target);
+      },
+      { once: true }
+    );
+  });
+  info("Initial mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 50, 5);
+  info("Waiting");
+  await new Promise(resolve => setTimeout(resolve, 400));
+  info("Second mouse move");
+  await EventUtils.synthesizeAndWaitNativeMouseMove(tab.linkedBrowser, 70, 5);
+  info("Waiting for tooltip to open");
+  let tooltip = await awaitTooltipOpen;
+
+  is(
+    tooltip.getAttribute("label"),
+    "shadow",
+    "tooltip label should match expectation"
+  );
+
+  info("Closing tab");
+  BrowserTestUtils.removeTab(tab);
+});
diff --git a/toolkit/components/tooltiptext/tests/title_test.svg b/toolkit/components/tooltiptext/tests/title_test.svg
new file mode 100644
index 0000000000..80390a3cca
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/title_test.svg
@@ -0,0 +1,59 @@
+<svg width="640px" height="480px" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <title>This is a root SVG element's title</title>
+  <foreignObject>
+    <html xmlns="http://www.w3.org/1999/xhtml">
+      <body>
+        <svg xmlns="http://www.w3.org/2000/svg" id="svg1">
+          <title>This is a non-root SVG element title</title>
+        </svg>
+      </body>
+    </html>
+  </foreignObject>
+  <text id="text1" x="10px" y="32px" font-size="24px">
+    This contains only &lt;title&gt;
+    <title>
+
+
+    This            is a title
+
+    </title>
+  </text>
+  <text id="text2" x="10px" y="96px" font-size="24px">
+    This contains only &lt;desc&gt;
+    <desc>This is a desc</desc>
+  </text>
+  <text id="text3" x="10px" y="128px" font-size="24px" title="ignored for SVG">
+    This contains nothing.
+  </text>
+  <a id="link1" href="#">
+    This link contains &lt;title&gt;
+    <title>
+      This is a title
+    </title>
+    <text id="text4" x="10px" y="192px" font-size="24px">
+    </text>
+  </a>
+  <a id="link2" href="#">
+    <text x="10px" y="192px" font-size="24px">
+      This text contains &lt;title&gt;
+      <title>
+      This is a title
+      </title>
+    </text>
+  </a>
+  <a id="link3" href="#" xlink:title="This is an xlink:title attribute">
+    <text x="10px" y="224px" font-size="24px">
+      This link contains &lt;title&gt; &amp; xlink:title attr.
+      <title>This is a title</title>
+    </text>
+  </a>
+  <a id="link4" href="#" xlink:title="This is an xlink:title attribute">
+    <text x="10px" y="256px" font-size="24px">
+      This link contains xlink:title attr.
+    </text>
+  </a>
+  <text id="text5" x="10px" y="160px" font-size="24px"
+        xlink:title="This is an xlink:title attribute but it isn't on a link" >
+    This contains nothing.
+  </text>
+</svg>
diff --git a/toolkit/components/tooltiptext/tests/xul_tooltiptext.xhtml b/toolkit/components/tooltiptext/tests/xul_tooltiptext.xhtml
new file mode 100644
index 0000000000..8288ffc5fc
--- /dev/null
+++ b/toolkit/components/tooltiptext/tests/xul_tooltiptext.xhtml
@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <xul:toolbox xmlns:html="http://www.w3.org/1999/xhtml"
+               xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+      <toolbar>
+          <toolbarbutton id="xulToolbarButton"
+                         tooltiptext="XUL tooltiptext"
+                         title="XUL title"/>
+      </toolbar>
+  </xul:toolbox>
+</html>