pandoc-3.10: test/command/3989.md

```
% 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" ]
    ]
]
```