Wordpress Comments Placeholders

wordpress-comments-placeholders.php

function modify_comment_form_fields($fields){

  $commenter = wp_get_current_commenter();
  $req = get_option( 'require_name_email' );
  $aria_req = ( $req ? " aria-required='true'" : "" );

  $fields['author'] = '<p class="comment-form-author">' .
                  '<input id="author" name="author" type="text" placeholder="Name*" value="' . esc_attr( $commenter['comment_author'] ) . '" size="20"' . $aria_req . ' /></p>';

  $fields['email'] = '<p class="comment-form-email">'.
  '<input id="email" name="email" type="text" placeholder="Email*" value="' . esc_attr(  $commenter['comment_author_email'] ) .
  '" size="30"' . $aria_req . ' /></p>';

  $fields['url'] = '<p class="comment-form-url">' .
    '<input id="url" name="url" type="text" placeholder="Website" value="' . esc_attr( $commenter['comment_author_url'] ) .
    '" size="30" /></p>';

  return $fields;
}

add_filter('comment_form_default_fields','modify_comment_form_fields');