A reply quoted what it answers one level deep: the lines of a message that was itself a reply kept their own ">" marks as text inside a single quote, so the editor showed one flat quote with "> > " lines in it. siv's rich text now holds a quote's level (be0f837). A line's whole run of marks, ">>" or "> >", gives its block's level, up to siv's 8; the text sent writes a mark per level, and the HTML nests a blockquote per level.