Not to mention that the article author apparently likes dark-on-light coloration ("light mode"), whereas I like light-on-dark ("dark mode").
Traditionally, most computers were light-on-dark. I think it was the Mac that really shifted things to dark-on-light:
My understanding from past reading was that that change was made because of the observation that at the time, people were generally working with computer representations of paper documents. For ink economy reasons, paper documents were normally dark-on-light. Ink costs something, so normally you'd rather put ink on 5% of the page rather than 95% of the page. If you had a computer showing a light-on-dark image of a document that would be subsequently printed and be dark-on-light on paper, that'd really break the WYSIWYG paradigm emerging at the time. So word processors and the like drove that decision to move to dark-on-light:
Prior to that, a word processor might have looked something like this (WordPerfect for DOS):
Technically, I suppose it wasn't the Mac where that "dark-on-light-following-paper" convention originated, just where it was popularized. The Apple IIgs had some kind of optional graphical environment that looked like a proto-Mac environment, though I rarely saw it used:
Update: apparently that wasn't actually released until after the Mac. This says that that graphical desktop was released in 1985, while the original 128K Mac came out in 1984. So it's really a dead-end side branch offshoot, rather than a predecessor.
The Mac derived from the Lisa at Apple (which never became very widespread):
And that derived from the Xerox Alto:
But for practical purposes, I think that it's reasonably fair to say that the Mac was really what spread dark-on-light. Then Windows picked up the convention, and it was really firmly entrenched:
Prior to that, MS-DOS was normally light-on-dark (with the basic command line environment being white-on-black, though with some apps following a convention of light on blue):
Apple ProDOS, widely used on Apple computers prior to the Mac, was light-on-dark:
The same was true of other early text-based PC environments, like the Commodore 64:
Or the TRS-80:
When I used VAX/VMS, it was normally off a VT terminal that would have been light-on-dark, normally green, amber, or white on black, depending upon the terminal:
And as far as I can recall, terminals for Unix were light-on-dark.
If you go all the way back before video terminals to teleprinters, those were putting their output directly on paper, so the ink issue comes up again, and they were dark-on-light:
But I think that there's a pretty good argument that, absent ink economy constraints, the historical preference has been to use light-on-dark on video displays.
There's also some argument that for OLED displays -- and, one assumes, any future emissive displays, where you only light up what needs to be light, rather than the LCD approach of lighting the whole thing up and then blocking and converting to heat what you don't want to be light -- draw somewhat less power for light-on-dark. That provides some battery benefits on portable devices, though in most cases, that's probably not a huge issue compared to eye comfort.
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