Answer stability round 1: 1 🔴, 6 🟡 (0 misread); hide the theme switch after its base rule, hide inert nav toggles, test the rendered result

CHANGELOG.md

@@ -8,11 +8,12 @@ at boot. Entries start at 0.3.0.
 
 ### The whole nav tree shows on engines without `:has()`
 
-On Chromium below 105 (webOS TV 22 and 23) every nested nav entry was hidden with nothing to open
-it. Now the tree folds only where `:has()` works and stays fully open elsewhere. The theme switch,
-which also needs `:has()`, is hidden there.
+On an engine without `:has()` (Chromium below 105, such as webOS TV 22 and 23, and Firefox below 121)
+every nested nav entry was hidden with nothing to open it. Now the tree folds only where `:has()`
+works and stays fully open elsewhere, with its toggles hidden. The theme switch, which also needs
+`:has()`, is hidden there.
 
-### Text meets 4.5:1 contrast
+### Button and badge text meets 4.5:1 contrast
 
 The primary button and the current page button take their text colour from the new `--on-accent`
 token: white in light mode, near-black in dark mode, where white on the accent was 2.7:1. The

e2e-tests/visual.spec.ts

@@ -174,6 +174,45 @@ test("the public landing at / is ungated and links to sign in + register", async
   await shot(page, "live-05-public-landing");
 });
 
+// Measured on the rendered button, so a theme block that drops --on-accent fails here.
+for (const colorScheme of ["light", "dark"] as const) {
+  test(`the primary button's text reaches 4.5:1 in ${colorScheme} mode`, async ({ page, context }) => {
+    await context.clearCookies();
+    await page.emulateMedia({ colorScheme });
+    await page.goto("/");
+    const ratio = await page.locator(".landing .btn-primary").first().evaluate((el) => {
+      const luminance = (rgb: string): number => {
+        const [r = 0, g = 0, b = 0] = (rgb.match(/[\d.]+/g) ?? []).map((c) => {
+          const v = Number(c) / 255;
+          return v <= 0.03928 ? v / 12.92 : ((v + 0.055) / 1.055) ** 2.4;
+        });
+        return 0.2126 * r + 0.7152 * g + 0.0722 * b;
+      };
+      const style = getComputedStyle(el);
+      const [hi = 0, lo = 0] = [luminance(style.color), luminance(style.backgroundColor)].sort((x, y) => y - x);
+      return (hi + 0.05) / (lo + 0.05);
+    });
+    expect(ratio).toBeGreaterThanOrEqual(4.5);
+  });
+}
+
+test("a nav branch is folded until its toggle opens it — no JavaScript", async ({ page }) => {
+  await page.goto("/dashboard");
+  const child = page.locator('.sidebar a[href="/scheduling"]');
+  await expect(child).toBeHidden();
+  await page.locator('.sidebar summary[aria-label="Toggle Scheduling"]').click();
+  await expect(child).toBeVisible();
+});
+
+test("the reference plugin's lead text is inset by --pad-x, like the bars around it", async ({ page }) => {
+  await page.goto("/scheduling");
+  const [inset, padX] = await page.locator(".scheduling-page > p").evaluate((p) => [
+    p.getBoundingClientRect().left - (p.parentElement as HTMLElement).getBoundingClientRect().left,
+    parseFloat(getComputedStyle(document.documentElement).getPropertyValue("--pad-x")),
+  ] as const);
+  expect(inset).toBe(padX);
+});
+
 test("unknown routes serve the 404 page (a real user-facing flow, covered end-to-end)", async ({ page }) => {
   allowConsole(/status of 404 .*\/no-such-page$/); // the navigation under test, which Chromium and WebKit log — not a sub-resource of it
   const res = await page.goto("/no-such-page");

examples/plugins/scheduling/public/scheduling.css

@@ -4,7 +4,7 @@
 .scheduling-page .table-wrap {
   margin-top: var(--space-3, 0.75rem);
 }
-/* Inset the elements that sit directly in the pane like the filter bar, table and pager around them. */
+/* Inset what sits directly in the pane by --pad-x, as the filter bar, table and pager already are. */
 .scheduling-page > p,
 .scheduling-page > .alert,
 .scheduling-page > .btn {

public/css/auth.css

@@ -1,8 +1,3 @@
-/* =============================================================
-   Auth flow — login / register / forgot password
-   Built on the shared tokens in styles.css. Pure HTML/CSS.
-   ============================================================= */
-
 .auth-stage {
   min-height: 100dvh;
   display: grid; place-items: center;
@@ -126,7 +121,6 @@
 .auth-aside a { color: var(--accent); }
 .auth-aside a:hover { text-decoration: underline; }
 
-/* field-level error, shown under a field the server marked .has-error */
 .field-error {
   display: none; align-items: center; gap: 6px; margin: 0;
   font-size: var(--fz-xs); color: var(--neg);

public/css/styles.css

@@ -191,9 +191,9 @@ summary { list-style: none; cursor: pointer; }
      • CLICKABLE = label is <a href>      → navigates on click.
        STATIC    = label is <span>        → not a navigation target.
    So "header" and "clickable" are independent: any combination works.
-   Children sit in a sibling <ul class="nav-children">. Where :has() works, it
-   folds them unless THIS row's own <details open> (scoped with > so a node
-   only ever controls its own subtree — infinite depth, no JS); elsewhere
+   Children sit in a sibling <ul class="nav-children">. Where :has() works, a
+   branch is folded unless THIS row's own <details open> (scoped with > so a node
+   only ever controls its own subtree — infinite depth, no JS). Without :has()
    every branch stays open, since nothing could reopen one.
    ============================================================ */
 .nav-row { display: flex; align-items: center; gap: 2px; }
@@ -262,8 +262,7 @@ span.nav-self { cursor: default; }                 /* static / non-clickable */
   padding: 8px; display: flex; flex-direction: column; gap: 6px;
 }
 
-/* theme segmented control — every theme rule is a :has(), so without it the switch is inert */
-@supports not selector(:has(a)) { .theme-switch { display: none; } }
+/* theme segmented control */
 .theme-switch {
   display: grid; grid-template-columns: repeat(3, 1fr);
   gap: 2px; padding: 2px;
@@ -285,6 +284,13 @@ span.nav-self { cursor: default; }                 /* static / non-clickable */
   outline: 2px solid var(--focus); outline-offset: 1px;
 }
 
+/* Without :has() every branch is open and every theme rule is inert: neither control does anything.
+   After the base rules, since @supports adds no specificity. */
+@supports not selector(:has(a)) {
+  .nav-disc { visibility: hidden; }  /* keeps its width, so the labels stay aligned */
+  .theme-switch { display: none; }
+}
+
 .footer-actions { display: flex; align-items: center; gap: 4px; }
 .profile {
   display: flex; align-items: center; gap: 9px; flex: 1 1 auto;

src/ui/stylesheet-contrast.test.ts

@@ -36,8 +36,3 @@ for (const theme of ["l", "d"]) {
     assert.ok(contrast(token(`${theme}-on-accent`), token(`${theme}-accent`)) >= 4.5);
   });
 }
-
-test("the primary button and the current page button use --on-accent", () => {
-  assert.match(css, /\.btn-primary\s*\{[^}]*color:\s*var\(--on-accent\)/);
-  assert.match(css, /\.page-btn\[aria-current="page"\]\s*\{[^}]*color:\s*var\(--on-accent\)/);
-});

src/ui/stylesheet-floor.test.ts

@@ -16,17 +16,30 @@ for (const file of readdirSync(cssDir).filter((f) => f.endsWith(".css"))) {
 
 const stylesheet = readFileSync(join(cssDir, "styles.css"), "utf8").replace(/\/\*[\s\S]*?\*\//g, "");
 
-// Below Chromium 105 nothing but `:has()` reveals a folded branch, so the fold may only exist where
-// the engine can undo it.
-test("styles.css hides .nav-children only inside @supports selector(:has(a))", () => {
-  const guard = stylesheet.indexOf("@supports selector(:has(a))");
-  assert.ok(guard >= 0, "no @supports selector(:has(a)) guard");
-  const hide = /\.nav-node\s*>\s*\.nav-children\s*\{\s*display:\s*none/.exec(stylesheet);
-  assert.ok(hide && hide.index > guard, "the fold rule is missing or precedes the guard");
-  const between = stylesheet.slice(guard, hide.index);
-  assert.equal(between.split("{").length - between.split("}").length, 1, "the guard closes before the fold rule");
+// The text is all there is to check: Playwright's engines all support `:has()`, so no E2E sees the
+// stylesheet an older engine gets.
+// Chromium below 105 and Firefox below 121 have no `:has()`, and nothing else reveals a folded
+// branch there, so the fold may only exist where `:has()` works.
+test("styles.css folds .nav-children only inside @supports selector(:has(a))", () => {
+  const open = stylesheet.indexOf("@supports selector(:has(a)) {");
+  assert.ok(open >= 0, "no @supports selector(:has(a)) block");
+  let depth = 0;
+  let close = open;
+  for (; close < stylesheet.length; close++) {
+    if (stylesheet[close] === "{") depth++;
+    if (stylesheet[close] === "}" && --depth === 0) break;
+  }
+  const outside = stylesheet.slice(0, open) + stylesheet.slice(close + 1);
+  assert.ok(!/\.nav-children\s*\{[^}]*display:\s*none/.test(outside), "a .nav-children rule hides it outside the guard");
+  assert.match(stylesheet.slice(open, close), /\.nav-children\s*\{\s*display:\s*none/, "the fold rule is gone");
 });
 
-test("styles.css hides the theme switch where :has() is missing", () => {
-  assert.match(stylesheet, /@supports not selector\(:has\(a\)\)\s*\{\s*\.theme-switch\s*\{\s*display:\s*none/);
+// `@supports` adds no specificity, so the hiding rule has to come after the base `.theme-switch` rule.
+test("styles.css hides the theme switch and the nav toggles where :has() is missing, after their base rules", () => {
+  const guard = stylesheet.indexOf("@supports not selector(:has(a)) {");
+  assert.ok(guard >= 0, "no @supports not selector(:has(a)) block");
+  assert.ok(guard > stylesheet.lastIndexOf(".theme-switch {", guard), "the guard precedes the base .theme-switch rule");
+  const block = stylesheet.slice(guard, stylesheet.indexOf("\n}", guard));
+  assert.match(block, /\.theme-switch\s*\{\s*display:\s*none/);
+  assert.match(block, /\.nav-disc\s*\{\s*visibility:\s*hidden/);
 });

views/partials/nav-tree.ejs

@@ -1,8 +1,8 @@
 <%#
   Recursive nav tree. Each node: { label, href?, icon?, count?, current?, open?, children? }.
   Shape is orthogonal: header (children → disclosure toggle + nested <ul>) vs leaf (spacer),
-  and clickable (href → <a>) vs static (<span>). The CSS reveals children only when the
-  sibling .nav-disc is [open]. `root` picks the outer class.
+  and clickable (href → <a>) vs static (<span>). Where :has() works, the CSS reveals children
+  only when the sibling .nav-disc is [open]; elsewhere it shows them all. `root` picks the outer class.
 %><%
   const nodes = locals.nodes || [];
   const root = locals.root !== false;