diff --git a/tests/Popup.html b/tests/Popup.html
index 766ac59e0d..d2a9685398 100644
--- a/tests/Popup.html
+++ b/tests/Popup.html
@@ -168,8 +168,7 @@
         var bColor = popup.div.style.backgroundColor;
         var goodColor = ( (bColor == color) || (bColor == hexColor));
         t.ok(goodColor, "good default popup.backgroundColor");
-
-        if (navigator.appName.indexOf("Microsoft") == -1) {
+        if (navigator.appName.indexOf("Microsoft") == -1 || new RegExp(/msie 10/).test(navigator.userAgent.toLowerCase())) {
             t.eq(parseFloat(popup.div.style.opacity), opacity, "good default popup.opacity");
         } else {
             t.eq(popup.div.style.filter, "alpha(opacity=" + opacity*100 + ")", "good default popup.opacity");
diff --git a/tests/Popup/AnchoredBubble.html b/tests/Popup/AnchoredBubble.html
index bd2d8123b2..f03ff09d8d 100644
--- a/tests/Popup/AnchoredBubble.html
+++ b/tests/Popup/AnchoredBubble.html
@@ -32,7 +32,7 @@
         popup.setOpacity(opacity);
         popup.draw(new OpenLayers.Pixel(x, y));
 
-        if (navigator.appName.indexOf("Microsoft") == -1) {
+        if (navigator.appName.indexOf("Microsoft") == -1 || new RegExp(/msie 10/).test(navigator.userAgent.toLowerCase())) {
             t.eq(parseFloat(popup.div.style.opacity), opacity, "good default popup.opacity");
         } else {
             t.eq(popup.div.style.filter, "alpha(opacity=" + opacity*100 + ")", "good default popup.opacity");
@@ -43,7 +43,7 @@
         t.ok(popup.groupDiv.parentNode.getElementsByTagName("span").length > 0, "popup.groupDiv.parentNode has SPAN children");
 
         var ricoCornerDiv = popup.groupDiv.parentNode.getElementsByTagName("span")[0];
-        if (navigator.appName.indexOf("Microsoft") == -1) {
+        if (navigator.appName.indexOf("Microsoft") == -1 || new RegExp(/msie 10/).test(navigator.userAgent.toLowerCase())) {
             t.eq(parseFloat(ricoCornerDiv.style.opacity), opacity, "good default ricoCornerDiv.opacity");
         } else {
             t.eq(ricoCornerDiv.style.filter, "alpha(opacity=" + opacity*100 + ")", "good default ricoCornerDiv.opacity");