diff --git a/README.md b/README.md
index a9a2791..8bd4419 100644
--- a/README.md
+++ b/README.md
@@ -204,6 +204,8 @@ red PR job against.
   Then pins the live tree: every committed content page is already up to date, so the
   tool and `page-csp.test.mjs` agree on what correct means, and a failure names the
   regenerate command. Zero dependencies.
+- `node --test scripts/inline-scripts.test.mjs` — checks shared inline-script extraction,
+  unique hook matching, page line numbers and stable V8 source URLs.
 - `node --test scripts/coverage-floor.test.mjs` — branch-coverage floor over the
   `scripts/*.mjs` helpers the other gates import (`page-csp.mjs`, `html-pages.mjs`,
   `actions-if.mjs`, `update-csp-hashes.mjs`, `inline-scripts.mjs`) and over every inline
diff --git a/scripts/carousels.test.mjs b/scripts/carousels.test.mjs
index 5b3c540..27cc68c 100644
--- a/scripts/carousels.test.mjs
+++ b/scripts/carousels.test.mjs
@@ -998,3 +998,22 @@ test("projects track inset: an empty computed padding-left counts as 0, not NaN"
   t.next.dispatch("click");
   assert.equal(t.lastScroll().left, SLIDE_PITCH, "would be NaN if the empty padding were not coerced");
 });
+
+test("hero: keyboard focuses a slide without links and retries unsupported focus options", () => {
+  const t = bootHero();
+  t.slides[0].children[0].focus();
+  t.slides[1].children.forEach((el) => el.remove());
+  const attempts = [];
+  const target = t.slides[1];
+  target.focus = (options) => {
+    attempts.push(options);
+    if (options) throw new TypeError('options unsupported');
+    t.doc.activeElement = target;
+  };
+  t.root.dispatch('keydown', { key: 'ArrowRight' });
+  assert.equal(t.currentIndex(), 1);
+  assert.equal(target.tabIndex, -1);
+  assert.deepEqual(attempts, [{ preventScroll: true }, undefined]);
+  assert.equal(t.doc.activeElement, target);
+  assert.equal(t.rotating(), false);
+});
diff --git a/scripts/coverage-floor.test.mjs b/scripts/coverage-floor.test.mjs
index 73c5fa9..7c5c51f 100644
--- a/scripts/coverage-floor.test.mjs
+++ b/scripts/coverage-floor.test.mjs
@@ -339,3 +339,44 @@ test("every branch of every scripts/*.mjs helper and every inline page script is
     ...problemsOf(inline, inlineRuns.runs),
   ], []);
 });
+
+test("fixture: real inline child coverage maps Function wrappers to original page lines", () => {
+  const dir = mkdtempSync(join(tmpdir(), "coverage-inline-fixture-"));
+  try {
+    mkdirSync(join(dir, "scripts"));
+    const page = '<h1>Fixture</h1>\n\n<script>\nfunction pick(x) {\n  return x ? "yes" : "no";\n}\nassert.equal(pick(flag), expected);\n</script>';
+    writeFileSync(join(dir, "page.html"), page);
+    const helper = pathToFileURL(join(HERE, "inline-scripts.mjs")).href;
+    writeFileSync(join(dir, "scripts", "page.test.mjs"), `
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { inlineScript } from ${JSON.stringify(helper)};
+const { src } = inlineScript(readFileSync("page.html", "utf8"), "page.html", "pick");
+new Function("assert", "flag", "expected", src)(assert, true, "yes");
+new Function("assert", "flag", "expected", "unusedLongParameter", src)(assert, true, "yes");
+`);
+    const registry = { "page.html": [{ hook: "pick" }] };
+    const sources = inlineSources(dir, registry);
+    const first = collect(dir, suiteFiles(dir));
+    assert.equal(first.status, 0, first.stdout + first.stderr);
+    const { runs, problems } = inlineRunsFromReports(first.reports, sources);
+    assert.deepEqual(problems, []);
+    assert.deepEqual([...runs.keys()], ["page.html#pick"]);
+    assert.deepEqual(problemsOf(sources, runs), [
+      'page.html#pick:5 `: "no"` never executed by the suite (add a test that asserts what this branch decides)',
+    ]);
+    assert.deepEqual(problemsOf(sources, new Map()), ['page.html#pick: never loaded by the suite']);
+    writeFileSync(join(dir, "scripts", "both.test.mjs"), `
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { inlineScript } from ${JSON.stringify(helper)};
+new Function("assert", "flag", "expected", inlineScript(readFileSync("page.html", "utf8"), "page.html", "pick").src)(assert, false, "no");
+`);
+    const both = collect(dir, suiteFiles(dir));
+    assert.equal(both.status, 0, both.stdout + both.stderr);
+    assert.deepEqual(problemsOf(sources, inlineRunsFromReports(both.reports, sources).runs), []);
+    assert.deepEqual([...inlineRunsFromReports([{ result: [{ url: "inline:unknown", functions: [] }, { url: "node:fs" }, { url: pathToFileURL(join(dir, "scripts", "unknown.mjs")).href }] }, {}], sources).runs], []);
+  } finally {
+    rmSync(dir, { recursive: true, force: true });
+  }
+});
diff --git a/scripts/inline-scripts.test.mjs b/scripts/inline-scripts.test.mjs
new file mode 100644
index 0000000..4bb46aa
--- /dev/null
+++ b/scripts/inline-scripts.test.mjs
@@ -0,0 +1,12 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { inlineScript, inlineUrl } from "./inline-scripts.mjs";
+
+test("inline extraction pins body, page line and stable source URL", () => {
+  const html = '<h1>Hi</h1>\n<script>\nwidget();\n</script>';
+  assert.equal(inlineScript(html, 'p.html', 'widget').line, 2);
+  assert.equal(inlineUrl('p.html', 'widget'), 'inline:p.html#widget');
+  assert.equal(inlineScript(html, 'p.html', 'widget').src, '\nwidget();\n\n//# sourceURL=inline:p.html#widget\n');
+  assert.throws(() => inlineScript(html, 'p.html', 'missing'), /p.html: expected exactly one.*found 0/);
+  assert.throws(() => inlineScript(html + html, 'p.html', 'widget'), /found 2/);
+});