diff --git a/normalize.css b/normalize.css
index 955481d6a..a7a42e76a 100644
--- a/normalize.css
+++ b/normalize.css
@@ -24,14 +24,16 @@ summary {
 }
 
 /**
- * Correct `inline-block` display not defined in IE 8/9.
+ * 1. Correct `inline-block` display not defined in IE 8/9.
+ * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
  */
 
 audio,
 canvas,
 progress,
 video {
-  display: inline-block;
+  display: inline-block; /* 1 */
+  vertical-align: baseline; /* 2 */
 }
 
 /**