diff --git a/wp-content/themes/twentyseventeen/style.css b/wp-content/themes/twentyseventeen/style.css
index 74a4715209..f69f53ea33 100644
--- a/wp-content/themes/twentyseventeen/style.css
+++ b/wp-content/themes/twentyseventeen/style.css
@@ -1690,6 +1690,24 @@ body:not(.title-tagline-hidden) .site-branding-text {
 	transform: translateX(-50%) translateY(-50%);
 }
 
+/* For browsers that support 'object-fit' */
+@supports ( object-fit: cover ) {
+	.has-header-image .custom-header-media img,
+	.has-header-video .custom-header-media video,
+	.has-header-video .custom-header-media iframe {
+		height: 100%;
+		left: 0;
+		-o-object-fit: cover;
+		object-fit: cover;
+		top: 0;
+		-ms-transform: none;
+		-moz-transform: none;
+		-webkit-transform: none;
+		transform: none;
+		width: 100%;
+	}
+}
+
 .wp-custom-header .wp-custom-header-video-button { /* Specificity prevents .color-dark button overrides */
 	background-color: rgba(34, 34, 34, 0.5);
 	border: 1px solid rgba(255, 255, 255, 0.6);
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 19f7d91e08..b86422280a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-39482';
+$wp_version = '4.8-alpha-39483';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.