base.css bug breaking details disclosure triangles

This is a report of a bug in
https://www.w3.org/StyleSheets/TR/2016/base.css that I'm sending to
www-archive (for now) because I don't know where it belongs.

I noticed this while reading:
https://drafts.css-houdini.org/css-typed-om-1/#transformvalue-objects

After the IDL block, there's a <details class="note"> whose summary
is "is2D Design Considerations".  The disclosure triangle for this
<details> is missing in Firefox, but present in Chrome.  It's
missing in Firefox because Firefox implements styling of <details>
as specified in
https://html.spec.whatwg.org/multipage/rendering.html#the-details-and-summary-elements
where the disclosure triangle is a list marker, and appears because
the <summary> is display:list-item.  Changing the display of summary
from list-item to block causes the disclosure triangle to disappear,
because Firefox supports the spec's mechanism for styling the
disclosure triangle.

The stylesheet https://www.w3.org/StyleSheets/TR/2016/base.css
contains (with line numbers):

    674         .note::before, .note > .marker,
    675         details.note > summary::before,
    676         details.note > summary > .marker {
    677                 text-transform: uppercase;
    678                 display: block;
    679                 color: hsl(120, 70%, 30%);
    680         }
    681         /* Add .note::before { content: "Note "; } for autogen label,
    682            or use class="marker" to mark up the label in source. */
    683 
    684         details.note > summary {
    685                 display: block;
    686                 color: hsl(120, 70%, 30%);
    687         }

I believe the correct fix for this is to remove line 685 from the
style sheet.  Note that line 678 should remain; it is not styling
summary elements.

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)