My biggest tips for taming the gremlins that reside in Adobe Illustrator's SVG Export would be convert to compound paths and always include a background rectangle that matches the same dimensions as your master SVG.   Take this simple example   If we leave them as rectangles, we get this for output: <svg  xmlns="" width="600" height="300" viewBox="0 0 600 300">   <rect width="600" height="300" fill="#000"/>   <g id="boxes">
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