[Webkit-unassigned] [Bug 208204] New: [GTK] Support color-schemes CSS property?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208204

            Bug ID: 208204
           Summary: [GTK] Support color-schemes CSS property?
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at gnome.org
                CC: bugs-noreply at webkitgtk.org, cassidy at elementary.io

Now that GTK port no longer uses foreign drawing to render widgets, since r257299, it's finally possible to support the color-schemes CSS property. (See bug #197947 for discussion of why this was not previously possible.)

Overview of how dark mode works currently:

Firefox and Chrome and WebKitGTK since r255342: indicate to the webpage whether user prefers a dark theme using prefers-color-scheme, but always render controls using light theme. (GOOD)

Safari only: indicates to the webpage whether user prefers a dark theme using prefers-color-scheme, renders light controls usually EXCEPT if website opts-in to dark form controls using color-schemes CSS property. (BEST)

Downsides: this would complicate the new built-in Adwaita theme, so we might not want to do it.

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