The HTML4.0 mirror is an exact mirror of version 4.0 of HTML (loose)
<f a1="v1" a2="v2"> Some text. More text</f>
(f 'a1 "v1" 'a2 "v2" "Some text." "More text")
The mirror function f distinguishes between attribute names, attribute values, and content strings
via the runtime types of the parameters together with their mutual position in the parameter list