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wp-content/themes/twentytwentyone/index.php

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+<?php
+/**
+ * The main template file
+ *
+ * This is the most generic template file in a WordPress theme
+ * and one of the two required files for a theme (the other being style.css).
+ * It is used to display a page when nothing more specific matches a query.
+ * E.g., it puts together the home page when no home.php file exists.
+ *
+ * @link https://developer.wordpress.org/themes/basics/template-hierarchy/
+ *
+ * @package WordPress
+ * @subpackage Twenty_Twenty_One
+ * @since Twenty Twenty-One 1.0
+ */
+
+get_header(); ?>
+
+<?php if ( is_home() && ! is_front_page() && ! empty( single_post_title( '', false ) ) ) : ?>
+	<header class="page-header alignwide">
+		<h1 class="page-title"><?php single_post_title(); ?></h1>
+	</header><!-- .page-header -->
+<?php endif; ?>
+
+<?php
+if ( have_posts() ) {
+
+	// Load posts loop.
+	while ( have_posts() ) {
+		the_post();
+
+		get_template_part( 'template-parts/content/content', get_theme_mod( 'display_excerpt_or_full_post', 'excerpt' ) );
+	}
+
+	// Previous/next page navigation.
+	twenty_twenty_one_the_posts_navigation();
+
+} else {
+
+	// If no content, include the "No posts found" template.
+	get_template_part( 'template-parts/content/content-none' );
+
+}
+
+get_footer();