svg`<svg width=${width} height=${height} style="background:gray">
${Array.from({ length: 1 + width / 40 }, (_, i) =>
Array.from(
{ length: 1 + height / 40 },
(_, j) =>
svg`<rect width=32 height=32 x=${i * 40} y=${j *
40} fill=black /><circle cx=${i * 40 - 4} cy=${j * 40 -
4} r=5 fill=white>`
)
).flat()}
`