diff --git a/web/scripts/e2e-player.mjs b/web/scripts/e2e-player.mjs
index 5c5ef5c..2e455e6 100644
--- a/web/scripts/e2e-player.mjs
+++ b/web/scripts/e2e-player.mjs
@@ -67,6 +67,19 @@ if (await page.locator('canvas.vp-sphere').count()) {
 }
 await page.screenshot({ path: `${SHOTS}/h1-auto.png` })
 
+// The 5-second buttons: back and on, the ball with them.
+{
+  await controls()
+  const t0 = (await vstate()).t
+  await page.getByRole('button', { name: 'On 5 seconds' }).click()
+  const t1 = (await vstate()).t
+  await page.getByRole('button', { name: 'Back 5 seconds' }).click()
+  await page.getByRole('button', { name: 'Back 5 seconds' }).click()
+  const t2 = (await vstate()).t
+  const ball = await page.evaluate(() => Number(document.querySelector('.vp input[type=range]').value))
+  check('+5 and −5 buttons', t1 - t0 > 4 && t1 - t0 < 6.5 && t1 - t2 > 9 && t1 - t2 < 11 && Math.abs(ball - t2) < 1, `${t0.toFixed(1)} → ${t1.toFixed(1)} → ${t2.toFixed(1)}, ball ${ball.toFixed(1)}`)
+}
+
 const mid = Math.floor(s.d / 2)
 mark('seek')
 await page.evaluate((m) => { document.querySelector('.vp video').currentTime = m }, mid)
diff --git a/web/src/Player.tsx b/web/src/Player.tsx
index 4b22c25..a336700 100644
--- a/web/src/Player.tsx
+++ b/web/src/Player.tsx
@@ -68,6 +68,14 @@ const I = ({ d, size: sz = 20, fill }: { d: string; size?: number; fill?: boolea
 const PLAY = 'M7 4.5v15l12.5-7.5z', PAUSE = 'M8 5v14M16 5v14', CHECK = 'M5 12.5l4.5 4.5L19 7.5', TUNE = 'M4 7h10M18 7h2M4 17h4M12 17h8M16 5v4M10 15v4'
 const FULL = 'M4 9V4h5M20 9V4h-5M4 15v5h5M20 15v5h-5', SMALL = 'M9 4v5H4M15 4v5h5M9 20v-5H4M15 20v-5h5', PHONE = 'M8 3h8a1 1 0 0 1 1 1v16a1 1 0 0 1-1 1H8a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1zM3 9a9 9 0 0 0 0 6M21 9a9 9 0 0 1 0 6'
 
+// Five seconds back or on: a circling arrow with the 5 inside.
+const Skip = ({ back }: { back?: boolean }) => (
+  <svg width={20} height={20} viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.8" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
+    <path d={back ? 'M12 5a7 7 0 1 1-7 7M12 5l2.5-2.5M12 5l2.5 2.5' : 'M12 5a7 7 0 1 0 7 7M12 5L9.5 2.5M12 5l-2.5 2.5'} />
+    <text x="12" y="15" textAnchor="middle" fontSize="7.5" fontWeight="700" fill="currentColor" stroke="none" fontFamily="system-ui, sans-serif">5</text>
+  </svg>
+)
+
 export default function Player({ path, sudo }: { path: string; sudo: boolean; name: string }) {
   const [open, setOpen] = useState<PlayOpen | null>(null)
   const [err, setErr] = useState('')
@@ -234,7 +242,9 @@ export default function Player({ path, sudo }: { path: string; sudo: boolean; na
   const seekBy = useCallback((d: number) => {
     const v = video.current
     if (!v) return
-    v.currentTime = Math.max(0, Math.min(info?.duration ?? v.duration, v.currentTime + d))
+    const to = Math.max(0, Math.min(info?.duration ?? v.duration, v.currentTime + d))
+    v.currentTime = to
+    setTime(to) // the ball goes there at once, made yet or not
     poke()
   }, [info, poke])
   // Full screen: the browser's where it has one for an element, else (an iPhone) the window.
@@ -336,6 +346,8 @@ export default function Player({ path, sudo }: { path: string; sudo: boolean; na
         </div>
         <div className="vp-row">
           <button className="vp-icon" onClick={toggle} aria-label={paused ? 'Play' : 'Pause'}>{paused ? <I d={PLAY} fill /> : <I d={PAUSE} />}</button>
+          <button className="vp-icon" onClick={() => seekBy(-5)} aria-label="Back 5 seconds" title="Back 5 seconds"><Skip back /></button>
+          <button className="vp-icon" onClick={() => seekBy(5)} aria-label="On 5 seconds" title="On 5 seconds"><Skip /></button>
           <span className="vp-time">{clock(shown)} / {clock(dur)}</span>
           <span className="spacer" />
           {vr && canMotion() && (