twentyfifteen_post_thumbnail()

209	function twentyfifteen_post_thumbnail() {210		if ( post_password_required() || is_attachment() || ! has_post_thumbnail() ) {211			return;212		}213 214		if ( is_singular() ) :215			?>216 217		<div class="post-thumbnail">218			<?php the_post_thumbnail(); ?>219	</div><!-- .post-thumbnail -->220 221	<?php else : ?>222 223	<a class="post-thumbnail" href="<?php the_permalink(); ?>" aria-hidden="true">224		<?php225			the_post_thumbnail( 'post-thumbnail', array( 'alt' => get_the_title() ) );226		?>227	</a>228 229		<?php230	endif; // End is_singular().231	}