1. CSS ::marker pseudo-element

    The `::marker` pseudo-element allows list item markers to be styled or have their content value customized.

  2. element api: pseudo: `type` parameter: `"::marker"` value

  3. css selector: `::after`: `::after::marker` nested pseudo-elements

  4. css selector: `::before`: `::before::marker` nested pseudo-elements

  5. css selector: `::marker`: animation and transition support

  6. css selector: `::marker`: `counter-increment`, `counter-reset`, and `counter-set` support

  7. css selector: `::marker`: `quotes` support