diff --git a/src/app/App.js b/src/app/App.js
index 1322c99..dbc77b3 100644
--- a/src/app/App.js
+++ b/src/app/App.js
@@ -52,6 +52,7 @@ export default class App extends Component {
 
         <div className="github-button-container">
           <iframe
+            title="Hello"
             src="https://ghbtns.com/github-btn.html?user=tomchentw&amp;repo=react-toastr&amp;type=watch&amp;count=true"
             allowTransparency="true"
             frameBorder="0"
@@ -60,6 +61,7 @@ export default class App extends Component {
             height="20"
           />
           <iframe
+            title="CLEAR"
             src="https://ghbtns.com/github-btn.html?user=tomchentw&amp;repo=react-toastr&amp;type=fork&amp;count=true"
             allowTransparency="true"
             frameBorder="0"
diff --git a/src/lib/ToastContainer.js b/src/lib/ToastContainer.js
index 2217ec7..ab3bdc8 100644
--- a/src/lib/ToastContainer.js
+++ b/src/lib/ToastContainer.js
@@ -125,9 +125,6 @@ export default class ToastContainer extends Component {
   }
 
   _handle_toast_remove(toastId) {
-    if (this.props.preventDuplicates) {
-      this.state.previousMessage = ``;
-    }
     const operationName = `${this.props.newestOnTop ? `reduceRight` : `reduce`}`;
     this.state.toasts[operationName]((found, toast, index) => {
       if (found || toast.toastId !== toastId) {
diff --git a/src/lib/ToastMessage/index.js b/src/lib/ToastMessage/index.js
index 566e7ad..4ce4b25 100644
--- a/src/lib/ToastMessage/index.js
+++ b/src/lib/ToastMessage/index.js
@@ -62,7 +62,7 @@ const ToastMessageSpec = {
   _render_close_button() {
     return this.props.closeButton ? (
       <button
-        className="toast-close-button" role="button"
+        className="toast-close-button"
         onClick={this._handle_close_button_click}
         dangerouslySetInnerHTML={{ __html: `&times;` }}
       />