$hr function
Creates a hr node.
Implementation
DOMElement $hr(
        {Object? id,
        Object? classes,
        Object? style,
        Map<String, String>? attributes,
        bool? hidden,
        bool commented = false}) =>
    $tag('hr',
        id: id,
        classes: classes,
        style: style,
        attributes: attributes,
        hidden: hidden,
        commented: commented);