Is there any way to add an attribute to the body tag?
For example:
<body test-attribute>
Obviously this can be easily edited in the theme, but I’m trying to figure out how to add it with a plugin.
2 Answers
It doesn’t appear that you can (easily) add arbitrary attributes to the <body> tag.
However, WordPress provides the function body_class() so you can add classes to the <body> tag.
If your theme uses it, you’ll find something along these lines in a template file (eg. header.php):
<body <?php body_class(); ?>>
In that case, you’ll be able to filter the array of classes being passed using the body_class filter:
add_filter( 'body_class', 'wpse388651_body_class' );
function wpse388651_body_class( $classes ) {
$classes[] = 'my-custom-class';
return $classes;
}