Re: [csswg-drafts] [css-display][css-pseudo] Is ::marker created by display:list-item or does it always exist? (#1793)

> If `::marker::marker` is invalid.

That's what Chromium does, if you enable experimental flags, the parser accepts `::before::marker` and `::after::marker` but `::marker::marker` is invalid (https://wpt.fyi/results/css/css-pseudo/parsing/tree-abiding-pseudo-elements.html).

> If in the future we allow display to apply, do we force it to compute `list-item` to `flow`?

Seems reasonable. Or more precisely, I would just remove `list-item` from the computed value. So `flow-root list-item` would become `flow-root`, not `flow`.

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