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SvgPathEditor https://yqnn.github.io/svg-path-editor/
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SVG commands https://developer.mozilla.org/en-US/docs/Web/SVG
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Flex: CSS Flexbox Layout Guide https://css-tricks.com/snippets/css/a-guide-to-flexbox/
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D3.js https://d3js.org
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Glitch to host frontend and backend code https://glitch.com/
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HTML docs https://developer.mozilla.org/HTML
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CSS docs https://developer.mozilla.org/CSS
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JavaScript docs https://developer.mozilla.org/JavaScript
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Jest testing library https://jestjs.io
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TC39: