diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe42a935..8c4105c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 * replaces PHP backtick operator with `exec`
 * adds PHP variant to calc folder sizes
+* updates H5BP to 4.3.0
 * updates jQuery to 2.1.1
 * updates json2.js to 2014-02-04
 * updates markdown-js to 0.5.0
diff --git a/src/_h5ai/client/css/lib/h5bp-main-header.less b/src/_h5ai/client/css/lib/h5bp-main-header.less
index 8e4439ab..804835e0 100644
--- a/src/_h5ai/client/css/lib/h5bp-main-header.less
+++ b/src/_h5ai/client/css/lib/h5bp-main-header.less
@@ -1,6 +1,6 @@
+/*! HTML5 Boilerplate v4.3.0 | MIT License | http://h5bp.com/ */
+
 /*
- * HTML5 Boilerplate
- *
  * What follows is the result of much research on cross-browser styling.
  * Credit left inline and big thanks to Nicolas Gallagher, Jonathan Neal,
  * Kroc Camen, and the H5BP dev community and team.
@@ -53,10 +53,14 @@ hr {
 }
 
 /*
- * Remove the gap between images and the bottom of their containers: h5bp.com/i/440
+ * Remove the gap between images, videos, audio and canvas and the bottom of
+ * their containers: h5bp.com/i/440
  */
 
-img {
+audio,
+canvas,
+img,
+video {
     vertical-align: middle;
 }
 
@@ -78,17 +82,6 @@ textarea {
     resize: vertical;
 }
 
-/* ==========================================================================
-   Chrome Frame prompt
-   ========================================================================== */
-
-.chromeframe {
-    margin: 0.2em 0;
-    background: #ccc;
-    color: #000;
-    padding: 0.2em 0;
-}
-
 /* ==========================================================================
    Author's custom styles
    ========================================================================== */
diff --git a/src/_h5ai/client/css/lib/h5bp-normalize.less b/src/_h5ai/client/css/lib/h5bp-normalize.less
index 8d57e3c9..42e24d68 100644
--- a/src/_h5ai/client/css/lib/h5bp-normalize.less
+++ b/src/_h5ai/client/css/lib/h5bp-normalize.less
@@ -1,4 +1,4 @@
-/*! normalize.css v1.1.1 | MIT License | git.io/normalize */
+/*! normalize.css v1.1.3 | MIT License | git.io/normalize */
 
 /* ==========================================================================
    HTML5 display definitions
@@ -59,22 +59,16 @@ audio:not([controls]) {
    ========================================================================== */
 
 /**
- * 1. Prevent system color scheme's background color being used in Firefox, IE,
- *    and Opera.
- * 2. Prevent system color scheme's text color being used in Firefox, IE, and
- *    Opera.
- * 3. Correct text resizing oddly in IE 6/7 when body `font-size` is set using
+ * 1. Correct text resizing oddly in IE 6/7 when body `font-size` is set using
  *    `em` units.
- * 4. Prevent iOS text size adjust after orientation change, without disabling
+ * 2. Prevent iOS text size adjust after orientation change, without disabling
  *    user zoom.
  */
 
 html {
-    background: #fff; /* 1 */
-    color: #000; /* 2 */
-    font-size: 100%; /* 3 */
-    -webkit-text-size-adjust: 100%; /* 4 */
-    -ms-text-size-adjust: 100%; /* 4 */
+    font-size: 100%; /* 1 */
+    -ms-text-size-adjust: 100%; /* 2 */
+    -webkit-text-size-adjust: 100%; /* 2 */
 }
 
 /**