tree-sitter-html/properties/highlights.css

tag_name {
  scope: 'tag';
}

/* TODO - highlight as an error? */
erroneous_end_tag_name {
  scope: 'tag';
}

doctype {
  scope: 'constant';
}

attribute_name {
  scope: 'attribute';
}

attribute_value {
  scope: 'string';
}

comment {
  scope: 'comment';
}