code: function createCustomRuby( frag ) {
    var $ruby = frag.firstChild
    var hruby = $.create( 'h-ruby' )
  
    hruby.innerHTML = $ruby.innerHTML
    $.setAttr( hruby, $ruby.attributes )
    hruby.normalize()
    return hruby
  }
docs: Create a new fake `<h-ruby>` element so the style sheets will render it as a polyfill, which also helps to avoid the UA style.