CSS Grids as simple as they are to design can get pretty complicated. Josh W Comeau's interactive guide to CSS contains sections that build on each other with examples and animations to visualise the concept.
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SVG is an interesting and versatile text-based image format. Now I know it's not the Christmas season, but Hunor Márton Borbély has put together an advent calendar for SVG examples, and I've only now started working through them. It's very interactive and informative. I know I'll definitely be using these examples as references in the future.
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