[Webkit-unassigned] [Bug 186219] New: [GTK] Correct behavior for dark themes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186219

            Bug ID: 186219
           Summary: [GTK] Correct behavior for dark themes
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cadubentzen at gmail.com
                CC: bugs-noreply at webkitgtk.org

Now that dark themes are working properly on text inputs after bug 126907, some issues that happen on Firefox can happen on WebKitGTK+ as well.

E.g. Say some website sets input[type=text] { background-color: "white" } and leave the color property alone. In dark themes it'll render a light text on a white background.

This issue can actually happen with any browser, just set input[type=text] { color: "white" } and you get white text on light background.

However, as many developers won't test their design in WebKitGTK+ with dark themes, it can be frequent to have pages with partial styling and then trouble in dark themes.

A few thoughts on this:

- As discussed on matrix with mcatanzaro (quote): Ideally we would have some way to say: "do not use GTK theme colors at all if any parent element has been styled". That might be quite hard to implement, though.

- Easy solution: stop using GTK for theming the web content or just stick to Adwaita light. Not so good for some distributions like Elementary that want to have their look and feel.

- Another possibility: adding a property in public API (UIProcess) to select the theme. So users could pick their theme of choice for the webview elements.

- Another: always switch to the light variant of the current theme. Not sure if this can be done reliably only with GTK calls or something would need to be hard-coded. It seems like in Firefox they use “gtk-application-prefer-dark-theme” but I get rendering issues with dark themes anyway.


Opinions on this would be highly appreciated to decide which path to pursue.

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