Hairline stat strip
A row of stat tiles joined by hairlines that are grid gap, not borders — the container paints the border color and the tiles paint the surface, so separators never double up or break when the row wraps — in a reporting form and in a second form where each tile is the filter for the list beneath it.
Reach for it when building
- summary strip at the top of a detail page
- dashboard KPI row
- account usage overview
- report header figures
- profile stats band
Reporting only — the figures are the whole job.
Same strip, working as the filter. Press a tile to narrow the list; press it again to clear.
- Bicycle drivetrain teardownDone
- Kiln firing, part threeDownloading
- Field recording — marsh at dawnQueued
- Lathe restoration, episode 12Done
- Sourdough hydration testsFailed
- Bookbinding: the long stitchQueued
Showing all 6 downloads.
<!-- Reporting form -->
<div class="hss-strip">
<div class="hss-tile">
<span class="hss-label">Documents</span>
<span class="hss-value">1,482</span>
<span class="hss-unit">this period</span>
</div>
<div class="hss-tile">
<span class="hss-label">Median time</span>
<span class="hss-value">3.2s</span>
<span class="hss-unit">last 24h</span>
</div>
<div class="hss-tile">
<span class="hss-label">Clean runs</span>
<span class="hss-value">98.4%</span>
<span class="hss-unit">no retries</span>
</div>
<div class="hss-tile">
<span class="hss-label">Quality score</span>
<span class="hss-value is-missing" aria-label="No value">—</span>
<span class="hss-unit">not rated yet</span>
</div>
</div>
<!-- Filter form: each tile narrows the list below -->
<div class="hss-strip hss-filter" role="group" aria-label="Filter downloads">
<button class="hss-tile" aria-pressed="false" data-status="done">
<span class="hss-label">Done</span>
<span class="hss-value">2</span>
<span class="hss-unit">downloads</span>
</button>
<!-- …All, Queued, Downloading, Failed -->
</div>Colors come from shared theme tokens — --surface, --ink, --border, --accent and friends — so this CSS carries no palette of its own. Use Runnable file to copy the tokens along with it.
.hss-strip {
display: grid;
gap: 1px; /* the hairline */
background: var(--border); /* shows through the gap */
border: 1px solid var(--border);
border-radius: var(--radius);
overflow: hidden;
grid-template-columns: 1fr;
}
@media (min-width: 21rem) { .hss-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 42rem) { .hss-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
/* Five filter tiles: flex-wrap, so a wrapped row grows to fill
instead of leaving an empty cell or squeezing the labels */
.hss-filter { display: flex; flex-wrap: wrap; }
.hss-filter .hss-tile { flex: 1 1 7rem; }
.hss-tile { background: var(--surface); padding: 12px 14px; min-width: 0; }
.hss-label {
display: block; font-family: ui-monospace, monospace;
font-size: 0.8125rem; text-transform: uppercase; color: var(--dim);
}
.hss-value { display: block; font-size: 1.6rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.hss-value.is-missing { color: var(--dim); }
.hss-tile[aria-pressed="true"] {
background: color-mix(in srgb, var(--accent) 14%, var(--surface));
}const tiles = document.querySelectorAll('.hss-filter .hss-tile');
const rows = document.querySelectorAll('[data-row-status]');
const status = document.querySelector('#hss-status');
tiles.forEach((tile) => tile.addEventListener('click', () => {
const wasPressed = tile.getAttribute('aria-pressed') === 'true';
const filter = wasPressed ? 'all' : tile.dataset.status;
tiles.forEach((other) => other.setAttribute('aria-pressed', String(!wasPressed && other === tile)));
let shown = 0;
rows.forEach((row) => {
const match = filter === 'all' || row.dataset.rowStatus === filter;
row.hidden = !match;
if (match) shown += 1;
});
// Counts on the tiles come from the unfiltered set, so they never change here.
status.textContent = filter === 'all'
? 'Showing all 6 downloads.'
: `Filtered to ${tile.dataset.label}: ${shown} of 6. Press the lit tile again to clear.`;
}));Build a strip of statistic tiles that reads as one joined instrument panel rather than a row of floating cards.
The separators between tiles must not be borders. Make the container a CSS grid with gap: 1px and give the container itself the border color as its background; each tile then paints the surface color on top. The 1px of container showing through the gap is the hairline. This is the entire pattern: real borders double where two tiles meet and leave a stray edge when auto-fit wraps the row, and a gap physically cannot do either.
Pin the column counts
One column, then two from 21rem, then four from 42rem, so a row never ends on a lone orphan tile.
Tile anatomy
A mono uppercase label, the figure in bold tabular numerals, and a unit line beneath.
Two rules of honesty
Render a missing value as a dimmed em dash, never a zero. Keep units with the number.
The filter form
Each tile is a toggle for the list beneath it. Compute the counts from the unfiltered set, and use aria-pressed rather than tab roles.
Section summaries above are abridged; the full prompt ships with the pattern.