pandoc -f markdown -t native
<span title="1st line of text <br> 2nd line of text">foo</span>
 <span title="1st line of text <br> 2nd line of text">foo</span>
^D
[Para [Span ("",[],[("title","1st line of text <br> 2nd line of text")]) [Str "foo"],SoftBreak,Span ("",[],[("title","1st line of text <br> 2nd line of text")]) [Str "foo"]]]