Super basic html5 menu output for WordPress

basic-html5-menu-wp.php

<?php

class Simple_Menu extends Walker_Nav_Menu {
  
	// prevent sub menu wrapping
	function start_lvl( &$output, $depth ) {
		$output .= "\n";
	}
	
	function end_lvl( &$output, $depth ) {
		$output .= "\n";
	}

	// menu items without <li> tags	
	function start_el( &$output, $item, $depth, $args ) {
		global $wp_query;
		$indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent
		
		// passed classes
		$classes = empty( $item->classes ) ? array() : (array) $item->classes;
		$class_names = esc_attr( implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) ) );
		
		// link attributes
		$attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
		$attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
		$attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
		$attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
		$attributes .= ' class="' . $class_names . '"';

		$item_output = sprintf( '%1$s<a%2$s>%3$s%4$s%5$s</a>%6$s',
			$args->before,
			$attributes,
			$args->link_before,
			apply_filters( 'the_title', $item->title, $item->ID ),
			$args->link_after,
			$args->after
		);
	  
		// build html
		$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
	}

	function end_el( &$output, $item, $depth, $args ) {
		$output .= "\n";
	}
}

// Usage
wp_nav_menu( array(
	'walker' => new Simple_Menu, // use the walker output from above
	'container' => false, // remove container div
	'items_wrap' => '<nav id="%1$s" class="%2$s">%3$s</nav>', // %3$s is replaced with the menu items
	'depth' => 1 // prevent output of nested sub level links
) );

// Codex page:
// http://codex.wordpress.org/Function_Reference/wp_nav_menu

?>