1 — color and font styling

::marker is a real, independently styled box now - its color/font are its own, not the list item's.

Item one
Item two
Item three

red marker, black text

::marker { color: red; }

Item one
Item two
Item three

large bold marker

::marker { font-size: 13pt; font-weight: bold; }

Item one
Item two
Item three

marker color vs. text color

::marker { color: green; }

Item one
Item two
Item three

both color and font-size

::marker { color: #8e44ad; font-size: 13pt; }

2 — content overrides

An explicit content value fully replaces the automatic bullet/number - no automatic "." suffix, so any spacing/punctuation must be in the string itself.

3 — direction

The marker's own direction is independent of the list item's own text direction.

4 — list-style-position: inside vs outside

An "inside" marker is a real first inline child of the list item's own content, flowing (and wrapping) like ordinary text; an "outside" marker (the default) hangs to the left, never affecting the item's own line-wrap.

5 — items whose content is block-level

A marker sits beside its item's principal block box whether the item's content is inline or block-level, so <li><p>…</p></li> is numbered exactly like its inline neighbour, and an item mixing the two is numbered once.

6 — a marker whose item breaks across a column

A column is a fragmentainer like a page, so the same rule holds: an outside marker goes with the column its item begins in, not the one it happens to finish in. The middle item below runs past the end of the first column; its bullet stays beside its own first line, and it gets no second one where it resumes.

Column item 1, long enough that the list runs past the end of the first column. word0 word1 word2 word3 word4 word5 word6 word7 word8 word9 word10 word11 word12 word13 word14 word15 word16 word17 word18 word19 word20 word21 word22 word23 word24 word25 word26 word27 word28 word29 word30 word31 word32 word33 word34 word35 word36 word37 word38 word39
Column item 2, long enough that the list runs past the end of the first column. word0 word1 word2 word3 word4 word5 word6 word7 word8 word9 word10 word11 word12 word13 word14 word15 word16 word17 word18 word19 word20 word21 word22 word23 word24 word25 word26 word27 word28 word29 word30 word31 word32 word33 word34 word35 word36 word37 word38 word39
Column item 3, long enough that the list runs past the end of the first column. word0 word1 word2 word3 word4 word5 word6 word7 word8 word9 word10 word11 word12 word13 word14 word15 word16 word17 word18 word19 word20 word21 word22 word23 word24 word25 word26 word27 word28 word29 word30 word31 word32 word33 word34 word35 word36 word37 word38 word39

7 — a marker whose item breaks across a page

An outside marker sits beside its item's first line, so it belongs to the page the item starts on even when the item's own text carries on onto the next one. The spacer below pushes the last item across the page boundary; its number must still appear, on the page its first line is on.