[css-syntax-3] "Consume a block's contents" leaves decls list with

[AtkinsSJ]

Consume a block's contents collects declarations into the decls list, but only copies that over into rules when an at-rule is encountered. If decls is not empty when <EOF-token> or <}-token> is encountered, those declarations are lost.

I think the fix is to change this:

<EOF-token>
<}-token>
Return rules.

into this:

<EOF-token>
<}-token>
If decls is not empty, append it to rules.
Return rules.

This at least worked for me.

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As a side note, not sure if #8834 is asking for this particular kind of feedback, but the new algorithms have been very straightforward to implement directly, and feel like a nice improvement to how they worked previously. (Token streams are how I'd ended up implementing it before so it's nice to have that actually match the spec!) So thanks @tabatkins