<body <?php body_class( $class ); ?>>
This question has been answered by BobRay. See the first response.
[[*Class]]
<div id="[[*Class]]"> </div>
I think the closest thing to that would be to create a Template Variable (TV) and put the "class" name (or whatever you want) in the TV value for each page. If you name the TV 'Class', you could put this tag in the template or text where you want the class name name to appear:
[[*Class]]
You can also do this to control the style of the page:
<div id="[[*Class]]"> </div>
<body class="[[$template_use]]">
<body class="[[$template-[[*template]]]]">
<body class="[[TemplateName]]" >
/* TemplateName snippet */
$query = $modx->newQuery('modTemplate', array(
'id' => $modx->resource->get('template'),
));
$query->select('templatename');
return $modx->getValue($query->prepare());