[Webkit-unassigned] [Bug 195016] New: WebKit has special UA stylesheet rule to give tables `border-color:grey`, which doesn't quite match spec & may be historical cruft

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195016

            Bug ID: 195016
           Summary: WebKit has special UA stylesheet rule to give tables
                    `border-color:grey`, which doesn't quite match spec &
                    may be historical cruft
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dholbert at mozilla.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

(This bug covers some behavior that's common between Blink & WebKit. I've filed https://bugs.chromium.org/p/chromium/issues/detail?id=935729 on Blink.)

STR:
(1) Load https://jsfiddle.net/a6n0cb9j/

EXPECTED RESULTS:
The borders should all be the same color.

ACTUAL RESULTS:
Safari 12 uses a grey border for the table, but a black border for the td and th.


Firefox 65 [1], Edge 18, and IE11 all give EXPECTED RESULTS, rendering both borders as black (via `currentColor`).

Technically the WHATWG HTML spec says all three borders should be grey, via this rule:
>  table, td, th { border-color: gray; }
https://html.spec.whatwg.org/multipage/rendering.html#tables-2

...but I think we should remove that entirely because code-archeology seems to indicate that this was for compatibility with IE at the time[2], and IE itself doesn't have this behavior anymore.  I've filed https://github.com/whatwg/html/issues/4391 on making this spec change.

[1] Firefox renders both borders black if the testcase is in standards-mode, or both gray in quirks mode. But I'd like to remove the quirks-mode behavior.

[2] Reference for code-archeology on the ancient-IE compat note: https://bugzilla.mozilla.org/show_bug.cgi?id=84307#c20 ("IE and Opera, which always use gray" back in 2006. Nowadays IE uses currentColor, i.e. black by default.)

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