I spent some time over the last few days sprucing up the documentation and adding some sample art to my "Block Painter" project—which I hadn't touched in seven years, according to git.
Block Painter uses a tiny amount of HTML/CSS/JS to show an arrangement of colored blocks. It's not a practical tool; more like a demo (in the "demoscene" sense of the word) or a toy. Good for a few minutes of amusement, perhaps.
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