Created attachment 398132 [details]
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Created attachment 398135 [details]
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Comment on attachment 398135 [details]
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View in context: https://bugs.webkit.org/attachment.cgi?id=398135&action=review

> Source/WebCore/page/FrameView.cpp:2990
> +#elif PLATFORM(WATCHOS)

Can we do this without a platform #ifdef in this cross-platform file?

> Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:540
> +    [self setBackgroundColor:[UIColor blackColor]];

What if the client has set _drawsBackground to NO?

Comment on attachment 398135 [details]
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View in context: https://bugs.webkit.org/attachment.cgi?id=398135&action=review

> Source/WebKit/ChangeLog:11
> +        the background color for web views. This will then get propogated to

propogated

Created attachment 399329 [details]
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Comment on attachment 399329 [details]
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View in context: https://bugs.webkit.org/attachment.cgi?id=399329&action=review

> Source/WebCore/style/UserAgentStyle.cpp:101
> +#define SYSTEM_BACKGROUND_COLOR "html{background-color: white;}"

no need for the space or ;