How can I modify or pre-process the <body>
tag to add the class body? I don't want to create a whole html.tpl.php just to add a class.
In your theme's template.php
file use the preprocess_html
hook:
function mytheme_preprocess_html(&$vars) {
$vars['classes_array'][] = 'new-class';
}
Remember to clear the caches once you've implemented the hook or Drupal won't pick it up.