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diff --git a/accessible/tests/mochitest/attributes.js b/accessible/tests/mochitest/attributes.js
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+++ b/accessible/tests/mochitest/attributes.js
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+/* import-globals-from common.js */
+
+// //////////////////////////////////////////////////////////////////////////////
+// Object attributes.
+
+/**
+ * Test object attributes.
+ *
+ * @param aAccOrElmOrID         [in] the accessible identifier
+ * @param aAttrs                [in] the map of expected object attributes
+ *                              (name/value pairs)
+ * @param aSkipUnexpectedAttrs  [in] points this function doesn't fail if
+ *                              unexpected attribute is encountered
+ * @param aTodo                 [in] true if this is a 'todo'
+ */
+function testAttrs(aAccOrElmOrID, aAttrs, aSkipUnexpectedAttrs, aTodo) {
+  testAttrsInternal(aAccOrElmOrID, aAttrs, aSkipUnexpectedAttrs, null, aTodo);
+}
+
+/**
+ * Test object attributes that must not be present.
+ *
+ * @param aAccOrElmOrID         [in] the accessible identifier
+ * @param aAbsentAttrs          [in] map of attributes that should not be
+ *                              present (name/value pairs)
+ * @param aTodo                 [in] true if this is a 'todo'
+ */
+function testAbsentAttrs(aAccOrElmOrID, aAbsentAttrs, aTodo) {
+  testAttrsInternal(aAccOrElmOrID, {}, true, aAbsentAttrs, aTodo);
+}
+
+/**
+ * Test object attributes that aren't right, but should be (todo)
+ *
+ * @param aAccOrElmOrID         [in] the accessible identifier
+ * @param aKey                  [in] attribute name
+ * @param aExpectedValue        [in] expected attribute value
+ */
+function todoAttr(aAccOrElmOrID, aKey, aExpectedValue) {
+  testAttrs(
+    aAccOrElmOrID,
+    Object.fromEntries([[aKey, aExpectedValue]]),
+    true,
+    true
+  );
+}
+
+/**
+ * Test CSS based object attributes.
+ */
+function testCSSAttrs(aID) {
+  var node = document.getElementById(aID);
+  var computedStyle = document.defaultView.getComputedStyle(node);
+
+  var attrs = {
+    display: computedStyle.display,
+    "text-align": computedStyle.textAlign,
+    "text-indent": computedStyle.textIndent,
+    "margin-left": computedStyle.marginLeft,
+    "margin-right": computedStyle.marginRight,
+    "margin-top": computedStyle.marginTop,
+    "margin-bottom": computedStyle.marginBottom,
+  };
+  testAttrs(aID, attrs, true);
+}
+
+/**
+ * Test the accessible that it doesn't have CSS-based object attributes.
+ */
+function testAbsentCSSAttrs(aID) {
+  var attrs = {
+    display: "",
+    "text-align": "",
+    "text-indent": "",
+    "margin-left": "",
+    "margin-right": "",
+    "margin-top": "",
+    "margin-bottom": "",
+  };
+  testAbsentAttrs(aID, attrs);
+}
+
+/**
+ * Test group object attributes (posinset, setsize and level) and
+ * nsIAccessible::groupPosition() method.
+ *
+ * @param aAccOrElmOrID  [in] the ID, DOM node or accessible
+ * @param aPosInSet      [in] the value of 'posinset' attribute
+ * @param aSetSize       [in] the value of 'setsize' attribute
+ * @param aLevel         [in, optional] the value of 'level' attribute
+ */
+function testGroupAttrs(aAccOrElmOrID, aPosInSet, aSetSize, aLevel, aTodo) {
+  var acc = getAccessible(aAccOrElmOrID);
+  var levelObj = {},
+    posInSetObj = {},
+    setSizeObj = {};
+  acc.groupPosition(levelObj, setSizeObj, posInSetObj);
+
+  let groupPos = {},
+    expectedGroupPos = {};
+
+  if (aPosInSet && aSetSize) {
+    groupPos.setsize = String(setSizeObj.value);
+    groupPos.posinset = String(posInSetObj.value);
+
+    expectedGroupPos.setsize = String(aSetSize);
+    expectedGroupPos.posinset = String(aPosInSet);
+  }
+
+  if (aLevel) {
+    groupPos.level = String(levelObj.value);
+
+    expectedGroupPos.level = String(aLevel);
+  }
+
+  compareSimpleObjects(
+    groupPos,
+    expectedGroupPos,
+    false,
+    "wrong groupPos",
+    aTodo
+  );
+
+  testAttrs(aAccOrElmOrID, expectedGroupPos, true, aTodo);
+}
+
+function testGroupParentAttrs(
+  aAccOrElmOrID,
+  aChildItemCount,
+  aIsHierarchical,
+  aTodo
+) {
+  testAttrs(
+    aAccOrElmOrID,
+    { "child-item-count": String(aChildItemCount) },
+    true,
+    aTodo
+  );
+
+  if (aIsHierarchical) {
+    testAttrs(aAccOrElmOrID, { tree: "true" }, true, aTodo);
+  } else {
+    testAbsentAttrs(aAccOrElmOrID, { tree: "true" });
+  }
+}
+
+// //////////////////////////////////////////////////////////////////////////////
+// Text attributes.
+
+/**
+ * Test text attributes.
+ *
+ * @param aID                   [in] the ID of DOM element having text
+ *                              accessible
+ * @param aOffset               [in] the offset inside text accessible to fetch
+ *                              text attributes
+ * @param aAttrs                [in] the map of expected text attributes
+ *                              (name/value pairs) exposed at the offset
+ * @param aDefAttrs             [in] the map of expected text attributes
+ *                              (name/value pairs) exposed on hyper text
+ *                              accessible
+ * @param aStartOffset          [in] expected start offset where text attributes
+ *                              are applied
+ * @param aEndOffset            [in] expected end offset where text attribute
+ *                              are applied
+ * @param aSkipUnexpectedAttrs  [in] points the function doesn't fail if
+ *                              unexpected attribute is encountered
+ */
+function testTextAttrs(
+  aID,
+  aOffset,
+  aAttrs,
+  aDefAttrs,
+  aStartOffset,
+  aEndOffset,
+  aSkipUnexpectedAttrs
+) {
+  var accessible = getAccessible(aID, [nsIAccessibleText]);
+  if (!accessible) {
+    return;
+  }
+
+  var startOffset = { value: -1 };
+  var endOffset = { value: -1 };
+
+  // do not include attributes exposed on hyper text accessible
+  var attrs = getTextAttributes(
+    aID,
+    accessible,
+    false,
+    aOffset,
+    startOffset,
+    endOffset
+  );
+
+  if (!attrs) {
+    return;
+  }
+
+  var errorMsg = " for " + aID + " at offset " + aOffset;
+
+  is(startOffset.value, aStartOffset, "Wrong start offset" + errorMsg);
+  is(endOffset.value, aEndOffset, "Wrong end offset" + errorMsg);
+
+  compareAttrs(errorMsg, attrs, aAttrs, aSkipUnexpectedAttrs);
+
+  // include attributes exposed on hyper text accessible
+  var expectedAttrs = {};
+  for (let name in aAttrs) {
+    expectedAttrs[name] = aAttrs[name];
+  }
+
+  for (let name in aDefAttrs) {
+    if (!(name in expectedAttrs)) {
+      expectedAttrs[name] = aDefAttrs[name];
+    }
+  }
+
+  attrs = getTextAttributes(
+    aID,
+    accessible,
+    true,
+    aOffset,
+    startOffset,
+    endOffset
+  );
+
+  if (!attrs) {
+    return;
+  }
+
+  compareAttrs(errorMsg, attrs, expectedAttrs, aSkipUnexpectedAttrs);
+}
+
+/**
+ * Test default text attributes.
+ *
+ * @param aID                   [in] the ID of DOM element having text
+ *                              accessible
+ * @param aDefAttrs             [in] the map of expected text attributes
+ *                              (name/value pairs)
+ * @param aSkipUnexpectedAttrs  [in] points the function doesn't fail if
+ *                              unexpected attribute is encountered
+ */
+function testDefaultTextAttrs(aID, aDefAttrs, aSkipUnexpectedAttrs) {
+  var accessible = getAccessible(aID, [nsIAccessibleText]);
+  if (!accessible) {
+    return;
+  }
+
+  var defAttrs = null;
+  try {
+    defAttrs = accessible.defaultTextAttributes;
+  } catch (e) {}
+
+  if (!defAttrs) {
+    ok(false, "Can't get default text attributes for " + aID);
+    return;
+  }
+
+  var errorMsg = ". Getting default text attributes for " + aID;
+  compareAttrs(errorMsg, defAttrs, aDefAttrs, aSkipUnexpectedAttrs);
+}
+
+/**
+ * Test text attributes for wrong offset.
+ */
+function testTextAttrsWrongOffset(aID, aOffset) {
+  var res = false;
+  try {
+    var s = {},
+      e = {};
+    // Bug 1602031
+    // eslint-disable-next-line no-undef
+    var acc = getAccessible(ID, [nsIAccessibleText]);
+    acc.getTextAttributes(false, 157, s, e);
+  } catch (ex) {
+    res = true;
+  }
+
+  ok(
+    res,
+    "text attributes are calculated successfully at wrong offset " +
+      aOffset +
+      " for " +
+      prettyName(aID)
+  );
+}
+
+const kNormalFontWeight = function equalsToNormal(aWeight) {
+  return aWeight <= 400;
+};
+
+const kBoldFontWeight = function equalsToBold(aWeight) {
+  return aWeight > 400;
+};
+
+let isNNT = SpecialPowers.getBoolPref("widget.non-native-theme.enabled");
+// The pt font size of the input element can vary by Linux distro.
+const kInputFontSize =
+  WIN || (MAC && isNNT)
+    ? "10pt"
+    : MAC
+    ? "8pt"
+    : function () {
+        return true;
+      };
+
+const kAbsentFontFamily = function (aFontFamily) {
+  return aFontFamily != "sans-serif";
+};
+const kInputFontFamily = function (aFontFamily) {
+  return aFontFamily != "sans-serif";
+};
+
+const kMonospaceFontFamily = function (aFontFamily) {
+  return aFontFamily != "monospace";
+};
+const kSansSerifFontFamily = function (aFontFamily) {
+  return aFontFamily != "sans-serif";
+};
+const kSerifFontFamily = function (aFontFamily) {
+  return aFontFamily != "serif";
+};
+
+const kCursiveFontFamily = LINUX ? "DejaVu Serif" : "Comic Sans MS";
+
+/**
+ * Return used font from the given computed style.
+ */
+function fontFamily(aComputedStyle) {
+  var name = aComputedStyle.fontFamily;
+  switch (name) {
+    case "monospace":
+      return kMonospaceFontFamily;
+    case "sans-serif":
+      return kSansSerifFontFamily;
+    case "serif":
+      return kSerifFontFamily;
+    default:
+      return name;
+  }
+}
+
+/**
+ * Returns a computed system color for this document.
+ */
+function getSystemColor(aColor) {
+  let { r, g, b, a } = InspectorUtils.colorToRGBA(aColor, document);
+  return a == 1 ? `rgb(${r}, ${g}, ${b})` : `rgba(${r}, ${g}, ${b}, ${a})`;
+}
+
+/**
+ * Build an object of default text attributes expected for the given accessible.
+ *
+ * @param aID          [in] identifier of accessible
+ * @param aFontSize    [in] font size
+ * @param aFontWeight  [in, optional] kBoldFontWeight or kNormalFontWeight,
+ *                      default value is kNormalFontWeight
+ */
+function buildDefaultTextAttrs(aID, aFontSize, aFontWeight, aFontFamily) {
+  var elm = getNode(aID);
+  var computedStyle = document.defaultView.getComputedStyle(elm);
+  var bgColor =
+    computedStyle.backgroundColor == "rgba(0, 0, 0, 0)"
+      ? getSystemColor("Canvas")
+      : computedStyle.backgroundColor;
+
+  var defAttrs = {
+    "font-style": computedStyle.fontStyle,
+    "font-size": aFontSize,
+    "background-color": bgColor,
+    "font-weight": aFontWeight ? aFontWeight : kNormalFontWeight,
+    color: computedStyle.color,
+    "font-family": aFontFamily ? aFontFamily : fontFamily(computedStyle),
+    "text-position": computedStyle.verticalAlign,
+  };
+
+  return defAttrs;
+}
+
+// //////////////////////////////////////////////////////////////////////////////
+// Private.
+
+function getTextAttributes(
+  aID,
+  aAccessible,
+  aIncludeDefAttrs,
+  aOffset,
+  aStartOffset,
+  aEndOffset
+) {
+  // This function expects the passed in accessible to already be queried for
+  // nsIAccessibleText.
+  var attrs = null;
+  try {
+    attrs = aAccessible.getTextAttributes(
+      aIncludeDefAttrs,
+      aOffset,
+      aStartOffset,
+      aEndOffset
+    );
+  } catch (e) {}
+
+  if (attrs) {
+    return attrs;
+  }
+
+  ok(false, "Can't get text attributes for " + aID);
+  return null;
+}
+
+function testAttrsInternal(
+  aAccOrElmOrID,
+  aAttrs,
+  aSkipUnexpectedAttrs,
+  aAbsentAttrs,
+  aTodo
+) {
+  var accessible = getAccessible(aAccOrElmOrID);
+  if (!accessible) {
+    return;
+  }
+
+  var attrs = null;
+  try {
+    attrs = accessible.attributes;
+  } catch (e) {}
+
+  if (!attrs) {
+    ok(false, "Can't get object attributes for " + prettyName(aAccOrElmOrID));
+    return;
+  }
+
+  var errorMsg = " for " + prettyName(aAccOrElmOrID);
+  compareAttrs(
+    errorMsg,
+    attrs,
+    aAttrs,
+    aSkipUnexpectedAttrs,
+    aAbsentAttrs,
+    aTodo
+  );
+}
+
+function compareAttrs(
+  aErrorMsg,
+  aAttrs,
+  aExpectedAttrs,
+  aSkipUnexpectedAttrs,
+  aAbsentAttrs,
+  aTodo
+) {
+  // Check if all obtained attributes are expected and have expected value.
+  let attrObject = {};
+  for (let prop of aAttrs.enumerate()) {
+    attrObject[prop.key] = prop.value;
+  }
+
+  // Create expected attributes set by using the return values from
+  // embedded functions to determine the entry's value.
+  let expectedObj = Object.fromEntries(
+    Object.entries(aExpectedAttrs).map(([k, v]) => {
+      if (v instanceof Function) {
+        // If value is a function that returns true given the received
+        // attribute value, assign the attribute value to the entry.
+        // If it is false, stringify the function for good error reporting.
+        let value = v(attrObject[k]) ? attrObject[k] : v.toString();
+        return [k, value];
+      }
+
+      return [k, v];
+    })
+  );
+
+  compareSimpleObjects(
+    attrObject,
+    expectedObj,
+    aSkipUnexpectedAttrs,
+    aErrorMsg,
+    aTodo
+  );
+
+  // Check if all unexpected attributes are absent.
+  if (aAbsentAttrs) {
+    let presentAttrs = Object.keys(attrObject).filter(
+      k => aAbsentAttrs[k] !== undefined
+    );
+    if (presentAttrs.length) {
+      (aTodo ? todo : ok)(
+        false,
+        `There were unexpected attributes: ${presentAttrs}`
+      );
+    }
+  }
+}
+
+function compareSimpleObjects(
+  aObj,
+  aExpectedObj,
+  aSkipUnexpectedAttrs,
+  aMessage,
+  aTodo
+) {
+  let keys = aSkipUnexpectedAttrs
+    ? Object.keys(aExpectedObj).sort()
+    : Object.keys(aObj).sort();
+  let o1 = JSON.stringify(aObj, keys);
+  let o2 = JSON.stringify(aExpectedObj, keys);
+
+  if (aTodo) {
+    todo_is(o1, o2, `${aMessage} - Got ${o1}, expected ${o2}`);
+  } else {
+    is(o1, o2, aMessage);
+  }
+}