[Webkit-unassigned] [Bug 197947] New: [GTK] Should use light theme unless website declares support for dark themes in color-schemes property

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197947

            Bug ID: 197947
           Summary: [GTK] Should use light theme unless website declares
                    support for dark themes in color-schemes 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 igalia.com
                CC: bugs-noreply at webkitgtk.org

Currently the web breaks pretty badly when users use a dark GTK theme. We should follow macOS in restricting dark theme usage to websites that have declared support for it using the color-scheme CSS property, as documented in https://webkit.org/blog/8840/dark-mode-support-in-webkit/.

This is not possible to do perfectly because GTK does not have any concept of dark vs. light themes, so we'll have to use heuristics. We can attempt to switch from a dark theme to light theme by default, e.g. by pruning -dark or :dark off the name of the GTK theme and hoping for the best. Then we can switch back to the dark theme variant only if used on websites that really support dark mode.

If we cannot switch like this due to performance considerations, then it's better to always try to prune the -dark portion of the theme name and use a light theme, because dark themes will never be web-compatible except for websites that opt-in.

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