Problem

The seeded onboarding pages (signin.html, welcome.html, account.html) import solid-oidc@0.0.8, which needs crypto.randomUUID (Chromium 92+, secure-context) and crypto.subtle (PKCE SHA-256 + DPoP). On de-Googled Android phones the Android System WebView is often stale (it updates via the Play Store, which isn't installed), so crypto.randomUUID is missing — and sign-in dies at the welcome → sign-in step with a cryptic:

crypto.randomUUID is not a function

This blocks the Solid-Pod-on-a-de-Googled-phone path (the whole point of the Android build).

Repro

De-Googled phone → jspod pod → welcome → "sign in" → crash (no useful message).

Fix (page-level, quick)

Polyfill crypto.randomUUID via crypto.getRandomValues (broadly supported, not secure-context-gated) before the solid-oidc module import, in all three onboarding pages. (signin.html already patched locally:)

<script>
if (typeof crypto !== 'undefined' && crypto.getRandomValues && !crypto.randomUUID) {
  crypto.randomUUID = function () {
    var b = crypto.getRandomValues(new Uint8Array(16));
    b[6] = (b[6] & 0x0f) | 0x40; b[8] = (b[8] & 0x3f) | 0x80;
    var h = []; for (var i = 0; i < 16; i++) h.push((b[i] + 0x100).toString(16).slice(1));
    return h[0]+h[1]+h[2]+h[3]+'-'+h[4]+h[5]+'-'+h[6]+h[7]+'-'+h[8]+h[9]+'-'+h[10]+h[11]+h[12]+h[13]+h[14]+h[15];
  };
}
</script>

Add the same to welcome.html (restores session on load → can call randomUUID) and account.html.

Caveat

This fixes only randomUUID. solid-oidc also needs crypto.subtle for PKCE/DPoP, which old WebViews / non-secure contexts lack and which can't be cheaply polyfilled (DPoP = real ECDSA key-gen/sign). So if subtle is also missing, sign-in still fails — the durable fix there is a modern browser. (subtle is the older API, so on a localhost secure context it's usually present and the polyfill is enough.)

Deployment

These pages are seeded to the Android pod from jspod@${JSPOD_PAGES_VERSION} via jsDelivr (overwrite=true), so the fix reaches devices via: republish jspod → bump JSPOD_PAGES_VERSION in js-pod/android → rebuild APK (re-seeds the patched pages on next launch).

Also (device-level)

Ship/keep a modern browser in the de-Googled phone image — the real fix for the crypto.subtle requirement.

Related

• JavaScriptSolidServer/solid-oidcdocs: slim README to 89 lines, hero block above the fold #10 — upstream graceful degradation (polyfill + clear error in the lib itself).
• js-pod/android — the device/WebView side.