Function cells_html_into 

pub fn cells_html_into(
    columns: &[Column<'_>],
    cells: &[Cell<'_>],
    opts: &Emit,
    out: &mut String,
)

A row’s cells, written into a buffer the caller already has.

cells_html’s streaming form, byte-identical to it, and the one a host rendering a table should call: a row is emitted once per row per render, so this is where a String per cell class is paid for most often.