1626560 - Pages with `color-scheme: dark` have too low link color contrast (in browsers that implement `color-scheme`)

Status: RESOLVED WORKSFORME

(Core :: CSS Parsing and Computation, enhancement)

Description

[Thomas Steiner]

Attachment: demo-dark.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:76.0) Gecko/20100101 Firefox/76.0

Steps to reproduce:

This is a potential blocker for https://bugzilla.mozilla.org/show_bug.cgi?id=1525107 and https://bugzilla.mozilla.org/show_bug.cgi?id=1576289

URLs (if applicable): https://color-scheme-demo.glitch.me/
Other browsers tested:
Add OK or FAIL after other browsers where you have tested this issue:
Safari: Fail
Chrome: Fail
IE/Edge: Fail (for old IE and new Edge)

Actual results:

What steps will reproduce the problem?

1. Go to https://color-scheme-demo.glitch.me/
2. Note how when the page is toggled to color-scheme: dark all user agent stylesheet link colors (apart from :active) have too low contrast.

Link colors (except for :active) should have enough contrast.

Expected results:

Link colors (except for :active) don't have enough contrast.

Comment 1

[Thomas Steiner]

Since this probably requires changes to the user agent stylesheets, it would be great to agree on a cross-browser set of dark scheme default link colors.

Chrome
WebKit
Firefox

Comment 2

[Thomas Steiner]

I have opened https://github.com/whatwg/html/issues/5426 for cross-vendor awareness.

Comment 3

[Daniel Holbert [:dholbert] (PTO until 2/24)]

I don't think this bug is testable or reproducible in Firefox, since we don't support color-scheme, per bug 1525107 [edit: sorry, I meant bug 1576289] (and the compat chart at https://developer.mozilla.org/en-US/docs/Web/CSS/color-scheme )

Am I understanding that right, or am I missing something here?

Comment 4

[Thomas Steiner]

That's correct, it's currently not reproducible. It's meant as a "forward-looking" bug. If you implement color-scheme, which, I think, you really should, then be aware that default colors need adjusting. Sorry if this wasn't clear from the previous comment (I used a Safari screenshot on purpose).

Comment 5

[Daniel Holbert [:dholbert] (PTO until 2/24)]

Gotcha. Sounds like there's some spec work that needs to be done, per:
https://github.com/whatwg/html/issues/5426#issuecomment-607396423
https://github.com/whatwg/html/issues/5426#issuecomment-608392373
https://github.com/whatwg/html/issues/5426#issuecomment-633867511

Comment 6

[Emilio Cobos Álvarez (:emilio)]

This should be fixed once we enable color-scheme support.