zumerlab
diff --git a/‎src/exporters/toCanvas.js‎
Lines changed: 6 additions & 2 deletions b/‎src/exporters/toCanvas.js‎
Lines changed: 6 additions & 2 deletions
@@ -282,9 +282,13 @@ async function waitForImgPaint(img, verify) {
  const probe = document.createElement('canvas')
  probe.width = 16
  probe.height = 16
+ // rAF with a timeout fallback: WebKit suspends rAF in occluded windows and
+ // background tabs, and a capture must not hang there.
+ const frame = () => new Promise(r => { requestAnimationFrame(r); setTimeout(r, 50) })
  const pctx = probe.getContext('2d', { willReadFrequently: true })
  if (!pctx) {
- await new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r)))
+ await frame()
+ await frame()
  return
  }
  const deadline = performance.now() + (verify ? 600 : 150)
@@ -295,7 +299,7 @@ async function waitForImgPaint(img, verify) {
  let ink = false
  for (let i = 3; i < d.length; i += 4) { if (d[i] > 0) { ink = true; break } }
  if (ink || performance.now() > deadline) return
- await new Promise(r => requestAnimationFrame(r))
+ await frame()
  }
  } finally {
  try { img.remove() } catch { /* ok */ }