If you can’t edit your header.php, or would prefer not to, most decent WordPress themes should have (and certainly any that pass theme review to be in the official repository)
<html <?php language_attributes();?> >
in the opening html tag in the header.php template.
There is a filter in the language_attributes() function that allows plugins/child themes to modify the ouput, like so:
function wpa89133( $output ) {
$output .= ' myprop1="val1" myprop2="val2"';
return $output;
}
add_filter( 'language_attributes', 'wpa89133' );
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