Developer shares four unexpected SVG and CSS quirks found while building a browser icon editor

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A developer building a fully browser-based icon editor at icons.jamuny.com documented four surprising behaviors encountered with SVG and CSS. CSS stylesheet rules were found to override inline SVG attribute values, requiring custom properties as a workaround for scaling stroke widths correctly during zoom. An unexpectedly large focus outline appeared in the editor because a CSS rule only targeted ':focus-visible' while the browser was applying a standard ':focus' style, which was diagnosed using a single 'getComputedStyle' call. The developer also discovered that CSS 'var()' custom properties work inside SVG presentation attributes just as they do in inline styles, contrary to initial assumptions. A separate contrast issue arose when translucent segment colors were composited against different theme backgrounds, which was resolved by manually calculating the composited color values to ensure sufficient contrast ratios across both light and dark themes.

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