alt Hacker NewsWindows 3 through windows 7 had pervasive support for dark mode as long as application developers didn't custom paint their user interfaces. Application developers started out almost all supporting system colors and gradually over the next 25 years or so started implementing their own custom-drawn interfaces, accelerated by embedded IE/mshtml views and then later even more by Electron. This concluded with practically zero interfaces supporting the system color scheme.
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Yeah, when dark mode became "a thing" my first reaction was "...didn't we have this already?"
I was a theme junkie back in Windows 98 times, but stopped bothering since it became increasingly clear that Microsoft was not really interested in supporting them after XP.
Custom painting isn't the only thing that broke it. You can customize the style (colors) of the native widgets to get a desired look but IIRC you could choose from system colors (follows the theme/mode automatically) or exact colors. Some applications used a mix of them which made the UI look awful if you switched away from whatever the default theme was.
Maybe the apps with the windows classic interface. I remember it starting mainly around the XP days when alls started designing these super ugly (but trendy at the time) rounded corner and bubbly interfaces that were static in resolution and colour scheme.
Yeah but "dark mode" for Win3 through WinXP was primarily to support passive matrix LCDs, which required inverted color schemes to appear with enough contrast to read. That is why the built-in "high contrast" color schemes look so aggressively awful.