i1 : DIV{"hi there", HR{}, "ho there" }
o1 = hi there
------------------------------------------------------------------------
ho there
o1 : DIV
|
i2 : html oo
o2 = <div>hi there<hr/>
ho there</div>
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The object HR is a mark-up type, with ancestor classes HypertextParagraph < Hypertext < BasicList < Thing.