diff --git a/wp-content/themes/twentyeleven/style.css b/wp-content/themes/twentyeleven/style.css
index 5307073466..0d6b391bc4 100644
--- a/wp-content/themes/twentyeleven/style.css
+++ b/wp-content/themes/twentyeleven/style.css
@@ -2283,6 +2283,18 @@ p.comment-form-comment {
 /* =Responsive Structure
 ----------------------------------------------- */
 
+/* Does the same thing as <meta name="viewport" content="width=device-width">,
+ * but in the future W3C standard way. -ms- prefix is required for IE10+ to 
+ * render responsive styling in Windows 8 "snapped" views; IE10+ does not honor 
+ * the meta tag. See http://core.trac.wordpress.org/ticket/25888.
+ */
+@-ms-viewport {
+	width: device-width;
+}
+@viewport {
+	width: device-width;
+}
+
 @media (max-width: 800px) {
 	/* Simplify the basic layout */
 	#main #content {
diff --git a/wp-content/themes/twentythirteen/style.css b/wp-content/themes/twentythirteen/style.css
index 71646fcbaf..a204c6e39d 100644
--- a/wp-content/themes/twentythirteen/style.css
+++ b/wp-content/themes/twentythirteen/style.css
@@ -2577,6 +2577,18 @@ footer.entry-meta {
  * ----------------------------------------------------------------------------
  */
 
+/* Does the same thing as <meta name="viewport" content="width=device-width">,
+ * but in the future W3C standard way. -ms- prefix is required for IE10+ to 
+ * render responsive styling in Windows 8 "snapped" views; IE10+ does not honor 
+ * the meta tag. See http://core.trac.wordpress.org/ticket/25888.
+ */
+@-ms-viewport {
+	width: device-width;
+}
+@viewport {
+	width: device-width;
+}
+
 @media (max-width: 1599px) {
 	.site {
 		border: 0;
diff --git a/wp-content/themes/twentytwelve/style.css b/wp-content/themes/twentytwelve/style.css
index 4786b50179..451990ce0c 100644
--- a/wp-content/themes/twentytwelve/style.css
+++ b/wp-content/themes/twentytwelve/style.css
@@ -1432,6 +1432,18 @@ img#wpstats {
 /* =Media queries
 -------------------------------------------------------------- */
 
+/* Does the same thing as <meta name="viewport" content="width=device-width">,
+ * but in the future W3C standard way. -ms- prefix is required for IE10+ to 
+ * render responsive styling in Windows 8 "snapped" views; IE10+ does not honor 
+ * the meta tag. See http://core.trac.wordpress.org/ticket/25888.
+ */
+@-ms-viewport {
+	width: device-width;
+}
+@viewport {
+	width: device-width;
+}
+
 /* Minimum width of 600 pixels. */
 @media screen and (min-width: 600px) {
 	.author-avatar {