diff --git a/src/Mod/AddonManager/loading.html b/src/Mod/AddonManager/loading.html
index 1c30b82306..913be41fcd 100644
--- a/src/Mod/AddonManager/loading.html
+++ b/src/Mod/AddonManager/loading.html
@@ -25,7 +25,7 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 -->
 
-<html>
+<html lang="">
 <head>
     <style>
         /* Absolute Center Spinner */
@@ -57,7 +57,7 @@ SOFTWARE.
         /* :not(:required) hides these rules from IE9 and below */
         .loading:not(:required) {
             /* hide "loading..." text */
-            font: 0/0 a;
+            font: 0px/0px a;
             color: transparent;
             text-shadow: none;
             background-color: transparent;
@@ -88,6 +88,7 @@ SOFTWARE.
             }
         }
     </style>
+    <title>Loading...</title>
 </head>
 <body>
     <div class="loading">Loading...</div>
