Don't let kses strip out ids from section tags

allow-ids.php

<?php
function x_allow_ids_on_tags() {
	global $allowedposttags;

	$tags = array( 'section', 'article' );
	$new_attributes = array( 'id' => array() );

	foreach ( $tags as $tag ) {
		if ( isset( $allowedposttags[ $tag ] ) && is_array( $allowedposttags[ $tag ] ) )
			$allowedposttags[ $tag ] = array_merge( $allowedposttags[ $tag ], $new_attributes );
	}
}

// Do it, to it!
add_action( 'init', 'x_allow_ids_on_tags' );