>
> This relates to the interoperability issues discussed below. You say "This
> change increases interop with Safari and Firefox which already provide a
> reasonable fallback style for <meter> elements with `appearance: none`,"
> but don't give detail on whether our "reasonable fallback style" is the
> same as or different from theirs.
>
We match both their fall back styles. Safari was already matching Firefox's
fallback style.
>From what I can tell with some brief testing with Firefox Linux and Safari
> Tech Preview MacOS, they both produce a 80x16 box with 0 margin and padding
> in this "primitive appearance" mode. Firefox's inspector does not show any
> UA styles, but Safari shows UA styles of: { box-sizing: border-box;
> display: inline-block; block-size: 1em; inline-size: 5em; vertical-align:
> -0.2em; }. These actually match the spec's expected "native appearance",
> but I guess the "native appearance" has slightly different visuals, e.g.
> rounded corners and a shinier progress color.
>
> What UA styles will we follow? Is there a chance we could agree on the
> same styles as Safari, and thus update the part of the HTML spec I pointed
> out above?
>
Yes. We
<https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/html/resources/html.css;drc=dc831485ae497e8fd857affbe214cb734662be8a;l=1126>
match Safari's UA style
<https://github.com/WebKit/WebKit/blob/9138960e6c997b65b73ab22dd7151217b04b9345/Source/WebCore/css/html.css#L1232>
.
> I don't think we should block this intent on getting this all specified
> perfectly, since the change you're making is bringing us closer to interop
> in a historically under-specified area. But I do want to understand to what
> extent we'll match Firefox and Safari, and it would be an excellent bonus
> if we took this opportunity to improve the spec for everyone while we were
> here.
>
Agreed. The fallback styles I added match both Firefox and Safari.
There is also an open css-ui github issue regarding how the fall back
styles should look like : [css-ui-4] appearance: none on <meter>
<https://github.com/w3c/csswg-drafts/issues/356#top>
> Those tests are a great start. If we can agree on the UA styles per the
> above, we could expand them using tests similar to these
> <https://github.com/search?q=repo%3Aweb-platform-tests%2Fwpt%20%22%40namespace%20url(urn%3Anot-html)%22&type=code>
> .
>
Thanks! That sounds good to me.
Regards,
Traian
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