Click Control Center in the menu bar, click Display, then click the Night Shift button. Tip: You can also turn Night Shift on and off using Control Center. Night Shift remains on until the next day or until you turn it off. ![]() By setting the appearance of this object from your AppDelegate, you can effect a specific appearance at launch. Click the Night Shift button on the right, then turn on Turn on until tomorrow. The setting in Xcode to change Appearance while debugging appears to use a private NSSystemAppearanceProxy object. Ideally It would be nice to be able to set a environment variable in you scheme to turn on dark mode. In macOS Mojave you can enable Dark Mode via System Preferences > General > Appearance > Light or Dark - but this is a one monolithic change. Another neat use for this could be to provide EPUB or PDF links for online books you can keep reading the online version or download the full version for later.Old question but I ran into the same situation today. Aside from providing a desktop and mobile version you could also link to an API or data view which is designed for easier consumption by computers. I think I'd prefer it if you could use a link tag to expose different versions of the same document, and allow the user to chose which version they prefer. It might not be a great experience, but if the operation I'm doing is really simple it might be enough. If I'm on mobile the browser could let me interface with it by providing a virtual trackpad. Even worse, these values cannot be changed by the user! For example, imagine an advanced image editing app meant for use with a mouse. ![]() Although I still think designing a website that handles all variations well is nigh impossible. Now you can use CSS media feature tests to check if the user has a pointing device and if they can hover over elements. Tons of websites take this narrow screen size to mean that I'm on mobile and drastically blow up the size of the text and UI elements, causing me to lose my position in the document. For example, sometimes I want to reference some API docs so I'll resize the window to be incredibly narrow and place it next to my editor. Using media queries with viewport size break points is usually not what you want. I'm typically not a fan of mobile first designs, since it usually leads to a worse experience for desktop users. Dark Mode doesn’t change the way your operating system works, but it does change typically white macOS screen elements like the dock, taskbar. The closest thing we have is the "desktop mode" switch on mobile browsers, but I think that depends on user-agent sniffing which is incredibly hacky. That’s right: macOS Mojave supports a Dark Mode. You can turn off Dark Mode with turn off. You usually want a desktop mode which is designed for use with a keyboard and mouse, and a mobile mode which is designed for use with a touch interface. Use Siri (on compatible Macs) by saying a command like turn on Dark Mode or even just Dark Mode. I think it would make it much easier to develop and design websites that target devices with drastically different requirements. I've thought about this a bit, and I wish websites could have different "modes" which you could switch to. I understand that exposing more system information can be used for fingerprinting, but why can't I be the one to decide what information I expose? You could expose standard color values by default and allow me to whitelist trusted websites to access real system styles. WebKit even added improved support for using system fonts in web content, although I don't know what state that's in. Here are three quick ways to turn on Dark Mode on your Mac running macOS Mojave or later. A few years back using the system font for UI elements started to gain a bit of popularity. I really like my system styles and I wish more web services could use similar element sizes and colors. There's also System font values, even if it's barely used. It's a damn shame that CSS System Colors was deprecated. One of the things I love about this feature is that it gives users the choice. ![]() I am creating a macOS app and I would like to test the app in dark mode. Unfortunately it's pretty well hidden, and I think it's unsupported by other browsers. Everything is in light mode and everybody is happy. For those that are unaware: Firefox still supports alternative style sheets.
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