In MacOS Mojave, released in 2018, Apple disabled subpixel antialiasing across the operating system. If you look at a modern monitor under a microscope, you won't see an orderly grid of R/G/B lines anymore. The physical arrangement of pixel LEDs has changed as well. Today's pixels are much smaller, invisible to the naked eye. Here's the problem: that article was written in 2012, before the era of high-DPI “retina” displays. You may have read a popular blog post, Stop “Fixing” Font Smoothing, that advocates against switching to “antialiased”. In the past, this was seen as an accessibility win, because it improved text contrast. This is a technique that aims to make text easier to read, by leveraging the R/G/B lights within each pixel. On MacOS computers, the browser will use “subpixel antialiasing” by default. Alright, so this one is a bit controversial.
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