JoshHeaps.Net/wwwroot/css/casino/holdem.css

@@ -2692,9 +2692,20 @@ button,
     display: none;
 }
 
-/* The bar is fixed over the page, so the sidebar needs room to scroll past it. */
+/* The bar is fixed over the page, so the page needs room to scroll past it.
-body.hasActionBar #holdemSidebar {
+
-    padding-bottom: 9rem;
+   This was 9rem on the sidebar alone, which gave the column of panels somewhere to go
+   and left the table's column with nothing. That is most of the page on a desktop, and
+   it is where the two links under the felt live: measured at 1280x900, the page had 36px
+   of scroll in it against the 94px needed to lift Common rulings out from under a toast,
+   so the focus handler asked for a scroll the page could not make.
+
+   On the whole app rather than one column, and taken from the bar's published height
+   rather than guessed, so it is right in both layouts — 0 when the bar is a rail down
+   the side, which takes no height at all. The fallback keeps the old number for the
+   moment before the first measurement lands. */
+body.hasActionBar #holdemApp {
+    padding-bottom: calc(var(--actionBarHeight, 9rem) + var(--sp-4));
 }
 
 /* ---------- The bar lines up with the table ----------
@@ -4086,12 +4097,25 @@ body.hasActionBar #toastHost {
         background: linear-gradient(180deg, var(--surface-2), var(--surface-1));
         box-shadow: 0 -14px 40px rgba(0, 0, 0, 0.65);
         transform: translateY(105%);
-        transition: transform 0.25s ease;
+        /* A transform moves a thing; it does not put it away. Parked off the bottom of
+           the window the sheet was still in the tab order and still in the accessibility
+           tree, so tabbing through a phone reached its Done button at y=850 on an 844px
+           screen — focused, announced, and impossible to see or scroll to, because a
+           fixed element does not move when the page does.
+
+           visibility does put it away: hidden takes the subtree out of the focus order
+           and off the tree, and unlike display it can be transitioned. The delay is what
+           keeps the slide-out visible — visibility flips at the end of the 0.25s on the
+           way out, and immediately on the way in. */
+        visibility: hidden;
+        transition: transform 0.25s ease, visibility 0s linear 0.25s;
         -webkit-overflow-scrolling: touch;
     }
 
     body.seatSheetOpen #seatEditorPanel {
         transform: translateY(0);
+        visibility: visible;
+        transition: transform 0.25s ease, visibility 0s;
     }
 
     .seatSheetGrip {
@@ -4707,6 +4731,40 @@ body.hasActionBar #toastHost {
     }
 }
 
+/* ---------- Focus is brought to rest where it can be seen ----------
+
+   The ring below was the easy half. The hard half is that the bar is fixed over the
+   bottom of the page, so it is not in the flow and the browser does not know it is
+   there: Tab to a control near the bottom and the browser scrolls it flush against the
+   edge of the window — under the bar — and considers the job done. Measured by tabbing
+   the whole page on a 390x844 phone: 16 stops came to rest completely covered and 27
+   more partly. That is WCAG 2.2 SC 2.4.11, which asks that a focused control not be
+   entirely hidden by something the page has put on top of it.
+
+   scroll-padding is the fix, and it goes on the scroll container rather than on the
+   controls: it tells the browser to treat the bottom of the viewport as not there when
+   it scrolls something into view. The number comes from the bar, which already
+   publishes its own height for the toast and the felt, so it cannot drift from the
+   bar's real size the way a guess would — and it is already 0 when the bar is hidden or
+   has become a rail down the side, which is the case scroll-padding-right answers.
+
+   The toast publishes its height into the same sum, because when the browser does
+   scroll it has to clear both.
+
+   This is only half of it, though, and the half that is easy to mistake for all of it.
+   scroll-padding only applies when the browser scrolls at all, and a control already
+   inside the viewport is one it sees no reason to move — a fixed overlay on top of it
+   does not enter into the decision. Measured on a 1280x900 desktop: tabbing to Common
+   rulings while a toast was up left it completely covered, and this rule did nothing
+   about it, because nothing scrolled. The other half is the focusin handler in main.js,
+   which measures the overlap and scrolls by it. */
+html {
+    scroll-padding-bottom: calc(
+        var(--actionBarHeight, 0px) + var(--toastHeight, 0px) +
+        var(--sp-4) + env(safe-area-inset-bottom, 0px));
+    scroll-padding-right: var(--actionRailW, 0px);
+}
+
 /* ---------- Keyboard focus ----------
    Three focus rules existed for the whole tool, so tabbing through it relied on
    whatever ring the browser draws by default — which on these dark, custom-painted

JoshHeaps.Net/wwwroot/js/casino/holdem/feedback.js

@@ -46,7 +46,10 @@ const Toast = {
 
         host.appendChild(toast);
         // Next frame, so the entrance transition actually runs.
-        requestAnimationFrame(() => toast.classList.add("toastVisible"));
+        requestAnimationFrame(() => {
+            toast.classList.add("toastVisible");
+            this.publishHeight();
+        });
 
         this.timer = setTimeout(
             () => this.dismiss(),
@@ -61,6 +64,24 @@ const Toast = {
         }
         const host = document.getElementById("toastHost");
         if (host) host.innerHTML = "";
+        this.publishHeight();
+    },
+
+    // How much of the bottom of the window this is standing on.
+    //
+    // The toast is fixed, so it is not in the flow and nothing scrolling a control into
+    // view knows it is there — measured on the desktop sweep, tabbing to Common rulings
+    // while a toast was up left the focus ring entirely behind it. The stylesheet adds
+    // this to the bar's own height to work out where a focused control has to stop, so
+    // it is published rather than guessed: the toast is one line or two depending on the
+    // message, and on a narrow screen the same message is taller again.
+    publishHeight() {
+        if (typeof document === "undefined" || !document.documentElement) return;
+        const host = document.getElementById("toastHost");
+        const height = host && host.firstElementChild
+            ? Math.round(host.getBoundingClientRect().height)
+            : 0;
+        document.documentElement.style.setProperty("--toastHeight", `${height}px`);
     },
 };
 

JoshHeaps.Net/wwwroot/js/casino/holdem/main.js

@@ -664,6 +664,70 @@ document.addEventListener("DOMContentLoaded", () => {
         }, 0);
     });
 
+    // Focus that lands underneath something fixed is moved out from under it.
+    //
+    // scroll-padding-bottom in the stylesheet is half of WCAG 2.4.11 and only half. It
+    // works when the browser has to scroll to reach the control at all — then the
+    // padding tells it where to stop. A control the browser already considers visible is
+    // one it will not scroll to at all, and a fixed overlay sitting on top of it does
+    // not change that: measured on a 1280x900 desktop, tabbing to Common rulings while a
+    // toast was up left it 100% covered, and scrollIntoView({block:"nearest"}) moved
+    // nothing, because "nearest" was already satisfied.
+    //
+    // So the overlap is worked out here and the page is scrolled by exactly it. Named
+    // overlays rather than every fixed element on the page, because this runs on every
+    // focus change and walking the whole DOM to find three known things would be work
+    // done ten times a second to reach the same answer. Anything inside one of them is
+    // left alone — the bar's own buttons are meant to be on top of the page.
+    const FIXED_OVERLAYS = "#actionBar, #toastHost, #seatEditorPanel";
+    document.addEventListener("focusin", event => {
+        const el = event.target;
+        if (!el || typeof el.getBoundingClientRect !== "function") return;
+        if (el.closest && el.closest(FIXED_OVERLAYS)) return;
+
+        const box = el.getBoundingClientRect();
+        if (box.width === 0 || box.height === 0) return;
+
+        let lift = 0;
+        document.querySelectorAll(FIXED_OVERLAYS).forEach(node => {
+            const style = getComputedStyle(node);
+            if (node.hidden || style.visibility === "hidden" || style.display === "none") return;
+            if (style.position !== "fixed") return;
+            const over = node.getBoundingClientRect();
+            if (over.width === 0 || over.height === 0) return;
+            // Only what is actually in the way: an overlay off to one side, like the
+            // rail on a phone held sideways, is not covering a control in the middle.
+            if (box.left >= over.right || box.right <= over.left) return;
+            if (box.bottom <= over.top || box.top >= over.bottom) return;
+            lift = Math.max(lift, box.bottom - over.top + 8);
+        });
+
+        // Instant rather than smooth. This is the page getting out of the way of
+        // something the dealer has already arrived at, and animating it would put the
+        // control they are typing into in motion under them.
+        if (lift > 0) window.scrollBy({ top: lift, behavior: "auto" });
+
+        // Scrolling is not always enough. The page only has as much room below its
+        // content as the padding under the app gives it, and that is sized for the bar
+        // — the toast stands on top of the bar, so a control at the very end of the page
+        // can be lifted clear of one and not the other. Measured at 1280x900: 94px of
+        // lift wanted, 26px of page to do it in.
+        //
+        // Sizing the padding for the toast as well would fix it by making the page grow
+        // and shrink by 64px every time anything is announced, which is a worse thing to
+        // do to a dealer than the fault. So the toast gives way instead: it is an
+        // eight-second message about something that has already happened, and it is
+        // standing on a control somebody has just navigated to. Only after the scroll
+        // has been tried, so a toast that is not in the way is left alone.
+        const toast = document.querySelector("#toastHost .toast");
+        if (!toast) return;
+        const after = el.getBoundingClientRect();
+        const over = toast.getBoundingClientRect();
+        const stillCovered = after.left < over.right && after.right > over.left &&
+            after.bottom > over.top && after.top < over.bottom;
+        if (stillCovered) Toast.dismiss();
+    });
+
     document.getElementById("resolvePotBtn").addEventListener("click", openPotWizard);
 
     [

tests/holdem/README.md

@@ -292,6 +292,44 @@ skipped rather than judged, since it is not in the tree to begin with.
 Removing the one `aria-label` this round added makes it report all five buttons, which is
 how it was checked.
 
+## Where the keyboard lands
+
+Two checks in `uiAudit.js` cover WCAG 2.2 SC 2.4.11, which says a focused control must
+not be completely hidden by something the page has put on top of it. Tabbing the whole
+page on a 390x844 phone found **16 stops resting completely covered and 27 more partly**,
+under the action bar; on the desktop, four more under a toast.
+
+They are checked as the fix rather than as the symptom, because the symptom needs a
+keyboard and this file has no automation of its own:
+
+- **`focusHasRoom()`** — `scroll-padding-bottom` on the scroll container has to reserve at
+  least as much room as the fixed furniture standing at the bottom of the window. Only
+  furniture crossing the middle of the screen counts, or the rail a landscape phone puts
+  down the right-hand side would demand scroll padding the height of the whole window;
+  and sticky elements inside a panel that scrolls on its own are excluded, because
+  scroll-padding on the document would do nothing about them.
+- **`focusablesReachable()`** — nothing focusable may sit entirely outside the viewport
+  inside a `position: fixed` subtree, since scrolling can never bring it back. The seat
+  editor's bottom sheet was put away with `transform: translateY(105%)`, which moves a
+  thing without putting it away: its Done button sat at y=850 on an 844px screen, still in
+  the tab order and still on the accessibility tree. `visibility: hidden` puts it away.
+
+### Half a fix looks exactly like a whole one
+
+`scroll-padding-bottom` alone was written up as the answer and it is only half of it. It
+applies when the browser has to scroll to reach the control at all; a control the browser
+already considers visible is one it will not scroll to, and a fixed overlay on top of it
+does not enter into that decision. Measured: tabbing to Common rulings with a toast up
+left it 100% covered, and `scrollIntoView({block: "nearest"})` moved nothing, because
+"nearest" was already satisfied. The sweep had shown clean only because 89 tab presses
+outlast an eight-second toast.
+
+So the other half is a `focusin` handler that measures the overlap and scrolls by it —
+and, when the page has no room left to scroll (26px available against 94px wanted, at
+1280x900), dismisses the toast instead. Sizing the page's bottom padding for the toast as
+well would have fixed it by making the page grow and shrink by 64px every time anything
+was announced, which is worse than the fault.
+
 ## Why the hand evaluator is tested the way it is
 
 `handRank.js` is the only module here that can pay the wrong person without anybody

tests/holdem/designTokens.test.js

@@ -105,9 +105,11 @@ describe("the tokens themselves", () => {
         const used = new Set((css.match(/var\((--[a-zA-Z0-9-]+)/g) || []).map(s => s.slice(4)));
         // Published from JS at runtime rather than declared here — see actionBar.js for
         // the first two, render.js for the seat width and the chip's denomination colour,
-        // which is picked per chip from the amount on it.
+        // which is picked per chip from the amount on it, and feedback.js for the
+        // toast's height, which is one line or two depending on what is being said.
         const fromScript = new Set([
             "--actionBarHeight", "--feltRoomPx", "--seatPuckW", "--betChipColour",
+            "--toastHeight",
         ]);
         // Defined by the site's own stylesheet, not this one.
         const fromSite = new Set(["--font-mono"]);

tests/holdem/uiAudit.js

@@ -96,6 +96,97 @@ const LayoutAudit = {
         return { name: "every control has a name a screen reader can read", offenders };
     },
 
+    // ---- Focus has somewhere to land ----
+
+    // Everything fixed to the bottom of the window, as one band. The action bar and the
+    // toast stack, so what matters is the top edge of the highest of them.
+    //
+    // Only things crossing the middle of the screen count. A landscape phone turns the
+    // bar into a rail down the right-hand side, which is bottom-anchored and full height
+    // — measuring that as "furniture at the bottom" would demand scroll padding the
+    // height of the whole window.
+    bottomFurniture() {
+        const middle = innerWidth / 2;
+        // A sticky element is anchored to whatever scrolls it, which is only the window
+        // when nothing between it and the root scrolls. The standings table has a sticky
+        // header inside a panel that scrolls on its own; it comes to rest against the
+        // bottom of the window often enough to be picked up here, and it is not
+        // furniture — scroll-padding on the document would do nothing about it.
+        const anchoredToWindow = node => {
+            if (getComputedStyle(node).position === "fixed") return true;
+            for (let up = node.parentElement; up && up !== document.body; up = up.parentElement) {
+                if (/auto|scroll|overlay/.test(getComputedStyle(up).overflowY)) return false;
+            }
+            return true;
+        };
+
+        return [...document.querySelectorAll("*")].filter(node => {
+            const cs = getComputedStyle(node);
+            if (cs.position !== "fixed" && cs.position !== "sticky") return false;
+            if (cs.visibility === "hidden" || cs.display === "none" || node.hidden) return false;
+            const b = node.getBoundingClientRect();
+            if (b.width === 0 || b.height === 0) return false;
+            if (b.bottom < innerHeight - 2 || b.left > middle || b.right < middle) return false;
+            return anchoredToWindow(node);
+        });
+    },
+
+    // WCAG 2.2 SC 2.4.11: a focused control must not be completely hidden by content the
+    // page put on top of it.
+    //
+    // A fixed bar is not in the flow, so the browser does not know it is there: Tab to a
+    // control near the bottom and it is scrolled flush against the edge of the window,
+    // under the bar, and the browser considers it done. Tabbing the whole page on a
+    // 390x844 phone found 16 stops resting completely covered and 27 more partly.
+    //
+    // Checked as the fix rather than the symptom, because the symptom needs a keyboard
+    // and this file has no automation of its own: scroll-padding-bottom on the scroll
+    // container has to reserve at least as much room as the furniture standing there.
+    focusHasRoom() {
+        const furniture = this.bottomFurniture();
+        if (furniture.length === 0) {
+            return { name: "focus has room under the fixed bar", offenders: [],
+                     skipped: "nothing is fixed to the bottom here" };
+        }
+
+        const highest = Math.min(...furniture.map(node => node.getBoundingClientRect().top));
+        const needed = Math.round(innerHeight - highest);
+        const declared = parseFloat(getComputedStyle(document.documentElement).scrollPaddingBottom);
+        const reserved = Number.isFinite(declared) ? Math.round(declared) : 0;
+
+        const offenders = reserved >= needed ? [] : [
+            `${furniture.map(n => this.describe(n)).join(" + ")} stands ${needed}px tall, ` +
+            `and scroll-padding-bottom reserves ${reserved}px — a control tabbed to down there ` +
+            `comes to rest ${needed - reserved}px inside it`,
+        ];
+        return { name: "focus has room under the fixed bar", offenders };
+    },
+
+    // The other half: a control that scrolling can never reach at all.
+    //
+    // The seat editor is a bottom sheet on a phone, and it was put away with
+    // `transform: translateY(105%)` — which moves it and nothing else. Parked below an
+    // 844px window at y=850, its Done button was still in the tab order and still on the
+    // accessibility tree, and because a fixed element does not move when the page does,
+    // no amount of scrolling could bring it back. visibility:hidden puts it away; a
+    // transform only moves it.
+    focusablesReachable() {
+        const offenders = this.visibleControls()
+            .filter(el => {
+                for (let node = el; node; node = node.parentElement) {
+                    if (getComputedStyle(node).position === "fixed") return true;
+                }
+                return false;
+            })
+            .filter(el => {
+                const b = el.getBoundingClientRect();
+                return b.top >= innerHeight || b.bottom <= 0 || b.left >= innerWidth || b.right <= 0;
+            })
+            .map(el => `${this.describe(el)} :: fixed and off-screen, so nothing can scroll to it`);
+
+        return { name: "no control is parked where scrolling can't reach it", offenders };
+    },
+
     // ---- Touch (see the mobile round) ----
 
     // Without touch-action: manipulation a mobile browser holds every tap for ~300ms
@@ -1145,6 +1236,8 @@ const LayoutAudit = {
             this.seatsOnTheTable(options.seatSlack),
             this.dialogActionsReachable(),
             this.controlNames(),
+            this.focusHasRoom(),
+            this.focusablesReachable(),
             this.touchAction(),
             this.tapHighlight(),
             this.textSelectable(),