`module Xml : XML with module W = Wrap`
`module Svg : Svg_sigs.Make(Xml).T with type +'a elt = 'a Svg.elt and type +'a attrib = 'a Svg.attrib`
`module Html : Html_sigs.Make(Xml)(Svg).T with type +'a elt = 'a Html.elt and type +'a attrib = 'a Html.attrib`
`val filter_attrib : 'a Html.attrib -> bool React.signal -> 'a Html.attrib`
`module Html5 : Html_sigs.Make(Xml)(Svg).T with type +'a elt = 'a Html.elt and type +'a attrib = 'a Html.attrib`