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▲ Devasta 10 hours ago

You've always been able to do it, doesn't even need to be HTML, serialise as XHTML and you can include the tags on your own namespace and have separate CSS for them.

<!DOCTYPE html>

<html

        xmlns="http://www.w3.org/1999/xhtml"

        xmlns:ns1="mynamespace"

        xmlns:ns2="yournamespace"
>

<body>

<CustomElement>Hello</CustomElement><!-- Custom element in the XHTML namespace -->

<ns1:CustomElement>Hello</ns1:CustomElement>

<ns2:CustomElement>Hello</ns2:CustomElement>

<style type="text/css">

    @namespace ns1 "mynamespace";

    @namespace ns2 "yournamespace";

    CustomElement {

        color:green;

    }

    ns1|CustomElement {

        color:red;

    }

    ns2|CustomElement {

        color:blue;

    }
</style>

</body>

</html>