Index: src/wp-content/themes/twentyseventeen/assets/js/global.js
===================================================================
--- src/wp-content/themes/twentyseventeen/assets/js/global.js	(revision 39072)
+++ src/wp-content/themes/twentyseventeen/assets/js/global.js	(working copy)
@@ -142,14 +142,15 @@
 	// Fires on document ready
 	$( document ).ready( function() {
 
-		// Let's fire some JavaScript!
-		setNavProps();
+		// If navigation menu is present on page, setNavProps and adjustScrollClass
+		if( $navigation.length ) {
+			setNavProps();
+			adjustScrollClass();
+		}
 
+		// If 'Scroll Down' arrow in present on page, calculate scroll offset and bind an event handler to the click event
 		if ( $menuScrollDown.length ) {
 
-			/**
-			 * 'Scroll Down' arrow in menu area
-			 */
 			if ( $( 'body' ).hasClass( 'admin-bar' ) ) {
 				menuTop -= 32;
 			}
@@ -156,6 +157,10 @@
 			if ( $( 'body' ).hasClass( 'blog' ) ) {
 				menuTop -= 30; // The div for latest posts has no space above content, add some to account for this
 			}
+			if ( ! $navigation.length ) {
+				navigationOuterHeight = 0;
+			}
+
 			$menuScrollDown.click( function( e ) {
 				e.preventDefault();
 				$( window ).scrollTo( '#primary', {
@@ -163,8 +168,6 @@
 					offset: { 'top': menuTop - navigationOuterHeight }
 				} );
 			} );
-
-			adjustScrollClass();
 		}
 
 		adjustHeaderHeight();
@@ -175,7 +178,8 @@
 		}
 	} );
 
-	if ( 'true' === twentyseventeenScreenReaderText.has_navigation ) {
+	// If navigation menu is present on page, adjust it on scroll and screen resize
+	if ( $navigation.length ) {
 
 		// On scroll, we want to stick/unstick the navigation
 		$( window ).on( 'scroll', function() {
@@ -187,7 +191,6 @@
 		$( window ).resize( function() {
 			setNavProps();
 			setTimeout( adjustScrollClass, 500 );
-			setTimeout( adjustHeaderHeight, 1000 );
 		} );
 	}
 
@@ -196,6 +199,7 @@
 		resizeTimer = setTimeout( function() {
 			belowEntryMetaClass( 'blockquote.alignleft, blockquote.alignright' );
 		}, 300 );
+		setTimeout( adjustHeaderHeight, 1000 );
 	} );
 
 }( jQuery ) );
Index: src/wp-content/themes/twentyseventeen/functions.php
===================================================================
--- src/wp-content/themes/twentyseventeen/functions.php	(revision 39072)
+++ src/wp-content/themes/twentyseventeen/functions.php	(working copy)
@@ -368,12 +368,10 @@
 
 	$twentyseventeen_l10n = array(
 		'quote'          => twentyseventeen_get_svg( array( 'icon' => 'quote-right' ) ),
-		'has_navigation' => 'false',
 	);
 
 	if ( has_nav_menu( 'top' ) ) {
 		wp_enqueue_script( 'twentyseventeen-navigation', get_theme_file_uri( '/assets/js/navigation.js' ), array(), '1.0', true );
-		$twentyseventeen_l10n['has_navigation'] = 'true';
 		$twentyseventeen_l10n['expand']         = __( 'Expand child menu', 'twentyseventeen' );
 		$twentyseventeen_l10n['collapse']       = __( 'Collapse child menu', 'twentyseventeen' );
 		$twentyseventeen_l10n['icon']           = twentyseventeen_get_svg( array( 'icon' => 'angle-down', 'fallback' => true ) );
Index: src/wp-content/themes/twentyseventeen/template-parts/navigation/navigation-top.php
===================================================================
--- src/wp-content/themes/twentyseventeen/template-parts/navigation/navigation-top.php	(revision 39072)
+++ src/wp-content/themes/twentyseventeen/template-parts/navigation/navigation-top.php	(working copy)
@@ -16,7 +16,7 @@
 		'menu_id'        => 'top-menu',
 	) ); ?>
 
-	<?php if ( twentyseventeen_is_frontpage() || ( is_home() && is_front_page() ) ) : ?>
+	<?php if ( ( twentyseventeen_is_frontpage() || ( is_home() && is_front_page() ) ) && has_custom_header() ) : ?>
 		<a href="#content" class="menu-scroll-down"><?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right' ) ); ?><span class="screen-reader-text"><?php _e( 'Scroll Down', 'twentyseventeen' ); ?></span></a>
 	<?php endif; ?>
 </nav><!-- #site-navigation -->