Index: src/wp-content/themes/twentyseventeen/style.css
===================================================================
--- src/wp-content/themes/twentyseventeen/style.css	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/style.css	(working copy)
@@ -451,7 +451,8 @@
 	font-weight: 300;
 }
 
-h2 {
+h2,
+.home.blog .entry-title {
 	color: #666;
 	font-size: 20px;
 	font-size: 1.25rem;
@@ -3153,6 +3154,7 @@
 	}
 
 	h2,
+	.home.blog .entry-title,
 	.page .panel-content .recent-posts .entry-title {
 		font-size: 26px;
 		font-size: 1.625rem;
Index: src/wp-content/themes/twentyseventeen/template-parts/post/content-audio.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/post/content-audio.php	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/template-parts/post/content-audio.php	(working copy)
@@ -33,6 +33,8 @@
 
 			if ( is_single() ) {
 				the_title( '<h1 class="entry-title">', '</h1>' );
+			} elseif ( is_front_page() && is_home() ) {
+				the_title( '<h3 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h3>' );
 			} else {
 				the_title( '<h2 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h2>' );
 			}
Index: src/wp-content/themes/twentyseventeen/template-parts/post/content-excerpt.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/post/content-excerpt.php	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/template-parts/post/content-excerpt.php	(working copy)
@@ -9,7 +9,7 @@
  * @package WordPress
  * @subpackage Twenty_Seventeen
  * @since 1.0
- * @version 1.0
+ * @version 1.1
  */
 
 ?>
@@ -30,7 +30,13 @@
 			</div><!-- .entry-meta -->
 		<?php endif; ?>
 
-		<?php the_title( sprintf( '<h2 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' ); ?>
+		<?php if ( is_front_page() && ! is_home() ) {
+
+			// The excerpt is being displayed within a front page section, so it's a lower hierarchy than h2.
+			the_title( sprintf( '<h3 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h3>' );
+		} else {
+			the_title( sprintf( '<h2 class="entry-title"><a href="%s" rel="bookmark">', esc_url( get_permalink() ) ), '</a></h2>' );
+		} ?>
 	</header><!-- .entry-header -->
 
 	<div class="entry-summary">
Index: src/wp-content/themes/twentyseventeen/template-parts/post/content-gallery.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/post/content-gallery.php	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/template-parts/post/content-gallery.php	(working copy)
@@ -33,6 +33,8 @@
 
 		if ( is_single() ) {
 			the_title( '<h1 class="entry-title">', '</h1>' );
+		} elseif ( is_front_page() && is_home() ) {
+			the_title( '<h3 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h3>' );
 		} else {
 			the_title( '<h2 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h2>' );
 		}
Index: src/wp-content/themes/twentyseventeen/template-parts/post/content-image.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/post/content-image.php	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/template-parts/post/content-image.php	(working copy)
@@ -33,6 +33,8 @@
 
 			if ( is_single() ) {
 				the_title( '<h1 class="entry-title">', '</h1>' );
+			} elseif ( is_front_page() && is_home() ) {
+				the_title( '<h3 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h3>' );
 			} else {
 				the_title( '<h2 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h2>' );
 			}
Index: src/wp-content/themes/twentyseventeen/template-parts/post/content-video.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/post/content-video.php	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/template-parts/post/content-video.php	(working copy)
@@ -33,6 +33,8 @@
 
 			if ( is_single() ) {
 				the_title( '<h1 class="entry-title">', '</h1>' );
+			} elseif ( is_front_page() && is_home() ) {
+				the_title( '<h3 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h3>' );
 			} else {
 				the_title( '<h2 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h2>' );
 			}
Index: src/wp-content/themes/twentyseventeen/template-parts/post/content.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/post/content.php	(revision 40394)
+++ src/wp-content/themes/twentyseventeen/template-parts/post/content.php	(working copy)
@@ -7,7 +7,7 @@
  * @package WordPress
  * @subpackage Twenty_Seventeen
  * @since 1.0
- * @version 1.0
+ * @version 1.1
  */
 
 ?>
@@ -33,6 +33,8 @@
 
 		if ( is_single() ) {
 			the_title( '<h1 class="entry-title">', '</h1>' );
+		} elseif ( is_front_page() && is_home() ) {
+			the_title( '<h3 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h3>' );
 		} else {
 			the_title( '<h2 class="entry-title"><a href="' . esc_url( get_permalink() ) . '" rel="bookmark">', '</a></h2>' );
 		}