jheapsandClaude Opus 5
5d5093f3cc
Three findings this round, all measured on the running page.
**1. The tool needed the internet to exist.**
The night already survived anything — it lives in localStorage — but the page
did not. Reload in somebody's back room with one bar of signal and a dealer
holding a phone in one hand and a deck in the other got a browser error page
with nine players waiting. Verified: with no worker, an offline reload is
net::ERR_INTERNET_DISCONNECTED.
There is now a service worker (wwwroot/casino/sw.js) and a manifest, so the
tool installs to a home screen and runs with the network switched off. Measured
end to end: 19 assets cached from one ordinary visit, then with the context
offline the page loads, draws six seats, applies its CSS, and plays a whole
hand — blinds posted, four calls, $800 still on the table.
Three decisions worth writing down:
* The precache list is read off the document rather than kept in the worker.
Every stylesheet and script is already in the DOM; a hand-written file list
stays right until somebody adds a script tag, and then the tool is quietly
offline-broken until a dealer finds out at a table.
* No skipWaiting. A new worker taking over a live page can hand it assets
from a different release than the ones it started with, and this page loads
seventeen scripts that expect to agree with each other.
* Stale-while-revalidate for assets, not cache-first — see finding 3.
Scope is /casino/ rather than /casino/texasholdem/, because a scope has to be a
prefix of the page it controls and "/casino/texasholdem" does not start with
"/casino/texasholdem/". Anything in scope the worker wasn't told about goes
straight to the network.
Program.cs needed .webmanifest added to the MIME map: an unknown extension is
not served with the wrong type, it is not served at all, and a 404 manifest is
exactly the silent failure that stops a browser ever offering "Add to Home
Screen".
**2. A screen reader read out the whole action bar after every tap.**
The bar carried aria-live on the element whose entire contents render() rebuilds
each action. Measured, after one tap:
"PRE-FLOP Pot $15 9 players Bob · $250 behind 0:00 ↶ dealing the hand U
Fold Call $10 Raise"
Nothing in it is wrong; it is unusable at the speed a hand is dealt, and it is
the documented anti-pattern — a live region has to be a stable element whose
text changes, not a container that gets replaced. There is now a small
role="status" element that exists from page load and says one sentence:
"Dee to act, $10 to call. Pot $15." Guarded on the sentence rather than on the
state, because render() runs for many reasons that don't change whose turn it
is, and a live region handed the same words twice reads them twice.
**3. Every tap rebuilt ninety DOM nodes.**
renderSeats did `innerHTML = ""` and then cloned a template, attached three sets
of listeners and set a dozen attributes per chair — on every render, and
renderAll runs after every action. Profiled on a nine-handed table:
renderSeats 7.3ms -> 4.0ms
renderAll 12.4ms -> 9.5ms
The pucks are built once and updated in place, which is what the rest of that
function was already doing to their contents. A seat's node belongs to its index
for as long as the table is that size, so the listeners still close over the
index; only a change in the number of chairs rebuilds the row. Verified that
listeners don't stack: one click after six renders fires the hook exactly once,
and resizing 9 -> 4 -> 10 renumbers correctly.
Found along the way and deliberately left alone: ViewData["cssVersion"] renders
empty on every page of the site, so the ?v= cache-busting has never worked. It
is inert — Program.cs sends Cache-Control: no-store on all static files — and
the service worker was the only reason to care, which is why it uses
stale-while-revalidate instead. Noted in TexasHoldem.cshtml.
608 tests, 0 failures, including a new announcing.test.js. 52 layout audits
across 13 viewports x 4 table sizes: 0 failures, and the action bar still
doesn't change height mid-hand. Gestures re-verified after the seat refactor:
double-tap fold, long-press menu, give-the-button, and the active dealer chip.
Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015bnp7xKUPFFSpwkYNFaPgb
Hold'em dealer tests
Unit tests for the money logic behind /Casino/TexasHoldem — the betting engine, the
side-pot calculator, the split calculator and the table state.
node --test tests/holdem/*.test.js
No install step, no package.json, no dependencies. The browser modules are plain
script-tag files that each end with a module.exports guard, so Node can require them
as-is; load.js puts them on globalThis under the same names they use to find each
other in the page, in the load order from TexasHoldem.cshtml.
What's covered
| File | Covers |
|---|---|
potCalculator.test.js |
Main and side pots, dead money, uncalled bets, odd-cent distribution |
betting.test.js |
Blinds, street completion, raises reopening the action, all-in run-outs |
state.test.js |
Button rotation, which seats post blinds, session standings |
splitCalculator.test.js |
Chopped pots, odd chips, unmakeable denominations |
invariants.test.js |
1000 randomised hands per property (see below) |
The layout audit
The unit tests above cover the money. uiAudit.js covers the thing you can only see
in a browser: whether a dealer can actually reach every control.
node tests/holdem/runUiAudit.js # needs Playwright and the site running
It checks WCAG AA contrast, touch target sizes, touch-action and tap highlights, that fields stay selectable and are large enough not to trigger iOS zoom, that nothing important is covered or off-screen with no way to scroll to it, that no grid column has collapsed to nothing, and that no text is painted outside its box. It runs over the table, all five overlays and Quick Split, at thirteen viewports from a 360px phone to a 1600px desktop and the same phones on their side — each viewport twice, once with a mouse and once with a thumb.
That last part, and two of those checks, are newer than this paragraph claiming them.
runAll() did not include the contrast check at all, and touch targets sat behind an
opt-in flag nothing passed, so "the audit is clean" meant nine checks rather than
eleven for a long run of rounds. Both were written and tested and simply never called.
The mouse/thumb pair matters for the same reason: the 44px rule stands itself down
where hover: hover says there is a pointer, and a headless desktop browser is a
pointer, so a single pass had never measured a touch target at any viewport. Between
them they found a 9px seat label at 3.39:1, a 37px-tall amount field and a 30px delete
button on Quick Split.
A check that decides it doesn't apply says so in the output rather than reporting no offenders, which reads identically to a pass. The same goes for the two exemptions that exist: a disabled control, which WCAG itself excuses, and a link inside a sentence, whose size is set by the line it sits in.
Deliberately not in CI: the unit suite is dependency-free and runs in a second, while
this one needs a browser and a running site. Run it after any change that adds or
resizes a control. With no Playwright to hand, paste uiAudit.js into devtools and
call LayoutAudit.runAll().
The contrast check is built so it cannot report a false positive: backgrounds
composite through alpha, and where a gradient is involved every colour stop is tried
and the most flattering one used. A finding means the text fails even under the
reading most generous to it. Two earlier attempts at this got it wrong in both
directions — one read only background-color and scored text on a gradient against
nothing, the other treated low-alpha stops as opaque — so uiAudit.js is checked
against known-answer cases before it is believed.
Touch targets are measured by probing outward with elementFromPoint rather than by
reading the element box, because the box lies in both directions: a small control can
be padded out with a transparent ::after and respond well beyond its painted size,
and a checkbox inside a label is hit by tapping the label. The 44px rule is only
enforced where hover: none says there's no mouse.
It exists because these checks were being re-typed into a console every time something changed, and each time they only covered whatever had just been touched. That is how the standings table shipped with a player-name column zero pixels wide and kept it for two rounds.
Why the randomised suite exists
Every correctness bug found in this tool so far has been shape-dependent: blinds posted to empty chairs, the button skipping past players, heads-up acting out of order, an overbet announced as a side pot. None of them show up on a full six-handed table with equal stacks, which is the table anyone writes a fixed example for.
invariants.test.js deals a thousand hands across random seat counts, random empty
chairs, random stack depths and random dealer input, and checks the things a dealer
would notice being wrong:
- chips are never created or destroyed during play
- the pot breakdown plus the uncalled returns always equal the money that went in
- paying the pot out settles it to the cent
- once uncalled chips are handed back, nobody is still betting above the whole table
- the button and both blinds always land on players who are actually in the hand
The generator is seeded, so a failure reproduces from the seed printed in the message rather than being a flake to re-run.