diff --git a/src/isErr.js b/src/isErr.js
index 6deb353b..d2d1542f 100644
--- a/src/isErr.js
+++ b/src/isErr.js
@@ -21,5 +21,11 @@
 _('objToStr');
 
 exports = function(val) {
-    return objToStr(val) === '[object Error]';
+    switch (objToStr(val)) {
+        case '[object Error]':
+        case '[object DOMException]':
+            return true;
+        default:
+            return val instanceof Error;
+    }
 };
diff --git a/test/isErr.js b/test/isErr.js
index 3d0c1d5c..55eb08fd 100644
--- a/test/isErr.js
+++ b/test/isErr.js
@@ -1,5 +1,10 @@
+const isBrowser = util.isBrowser;
+
 it('true', function() {
     expect(isErr(new Error())).to.be.true;
+    if (isBrowser) {
+        expect(isErr(new DOMException('test'))).to.be.true;
+    }
 });
 
 it('false', function() {