Re: [MediaQueries4] media feature proposal: display-colors-inverted (previously from IndieUI User Context)

James,

I would suggest a modification of your note:

from:
Note: Privacy and fingerprinting concerns related to this media feature are
minimal, since it is unlikely that most individuals will have this setting
enabled all the time.

to:

Note: Privacy and fingerprinting concerns related to this media feature are
minimal, since it is unlikely that most individuals will have this setting
enabled all the time. This setting could be driven by minimal lighting
conditions detected by the device much the same way automobile navigation
systems change color schemes in response to lighting conditions.

Rich





Rich Schwerdtfeger



From: James Craig <jcraig@apple.com>
To: Indie UI <public-indie-ui@w3.org>,
Cc: Cynthia Shelly <cyns@exchange.microsoft.com>
Date: 10/16/2013 05:47 PM
Subject: [MediaQueries4] media feature proposal: display-colors-inverted
            (previously from IndieUI User Context)



Based on discussion over the last several months both on the list and on
the calls, we’ve decided that several of the “user context” keys fit will
into the format of media queries. This first one is an easy win, no brainer
about display inversion. The other issues that will follow include user
contrast preferences settings (including Microsoft’s high contrast mode)
and text settings like minimum font size, letter-spacing, etc.

If there are no objections or calls to delay, I will forward this first
message to the CSS working group on Monday of next week.

Thanks,
James


————— Draft Email —————

Hello CSS Working Group,

This is the first of several features previously specified as part of
IndieUI User Context. After much consideration, the IndieUI Working Group
determined that some features are better suited as media features than as
part of the IndieUI work. I will start a new thread per feature (or feature
group) to ensure the discussions are self-contained.
display-colors-inverted is the first feature proposal.

display-colors-inverted: inverted | off;

In this example, the hardware display rendering is inverted, so the web app
could *double-invert* foreground image and video content, which usually
looks strange while inverted. This would leave text foreground color, all
background colors, and background styles inverted to adhere to user
setting.

@media (display-colors-inverted: inverted) {
    img, video {
        filter: invert(100%);
    }
}

The basic idea is that an inverted screen could display content images like
the first screen shot, instead of the default where everything is inverted,
shown in the second screen shot. Notice the user icons are inverted and
therefore, among other things, skin tones are unnatural:


(Alt: Screen shots of Twitter mobile web app on an iOS device with “Invert
Colors” feature enabled.)

Note: Privacy and fingerprinting concerns related to this media feature are
minimal, since it is unlikely that most individuals will have this setting
enabled all the time.

Related concepts:

From <UIKit/UIAccessibility.h>
// Returns whether the system preference for invert colors is enabled.
UIKIT_EXTERN BOOL UIAccessibilityIsInvertColorsEnabled() NS_AVAILABLE_IOS
(6_0);
UIKIT_EXTERN NSString *const
UIAccessibilityInvertColorsStatusDidChangeNotification NS_AVAILABLE_IOS
(6_0);

https://developer.apple.com/library/ios/documentation/uikit/reference/UIKitFunctionReference/Reference/reference.html#//apple_ref/c/func/UIAccessibilityIsInvertColorsEnabled


https://developer.apple.com/library/ios/documentation/uikit/reference/UIAccessibility_Protocol/Introduction/Introduction.html#//apple_ref/c/data/UIAccessibilityInvertColorsStatusDidChangeNotification


Mac OS X and other platforms have similar features to invert display
colors.