diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 76018d4..aee5a55 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -154,7 +154,7 @@ jobs:
         env:
           CARTOLITE_BASE_URL: http://127.0.0.1:39476
           PLAYWRIGHT_HTML_OUTPUT_DIR: focused-playwright-report
-        run: npm run test:e2e -- --grep '@terrain|@world' --output focused-test-results
+        run: npm run test:e2e -- --grep '@terrain|@world|@regions' --output focused-test-results
       - name: Complete desktop and mobile browser suite
         if: matrix.arch == 'amd64'
         working-directory: web
@@ -170,7 +170,7 @@ jobs:
           ) &
           publisher_pid=$!
           trap 'kill "$publisher_pid" >/dev/null 2>&1 || true' EXIT
-          npm run test:e2e -- --grep-invert '@terrain|@world'
+          npm run test:e2e -- --grep-invert '@terrain|@world|@regions'
       - uses: aquasecurity/trivy-action@ed142fd0673e97e23eac54620cfb913e5ce36c25 # v0.36.0
         with:
           scan-type: image
diff --git a/web/e2e/netgraph-regions.spec.ts b/web/e2e/netgraph-regions.spec.ts
index b840644..80460e5 100644
--- a/web/e2e/netgraph-regions.spec.ts
+++ b/web/e2e/netgraph-regions.spec.ts
@@ -34,7 +34,7 @@ async function layoutPanel(page: Page) {
   await page.locator('.graph-layout > summary').click();
 }
 
-test('spacing and dragging survive refresh while live packets keep their routes and clock', async ({ page, context }, info) => {
+test('spacing and dragging survive refresh while live packets keep their routes and clock @regions', async ({ page, context }, info) => {
   if (info.project.name === 'mobile') await page.setViewportSize({ width: 320, height: 640 });
   await fixture(page); await page.emulateMedia({ reducedMotion: 'reduce' }); await page.goto('/netgraph/');
   const stage = page.locator('#netgraph-stage');
@@ -55,6 +55,7 @@ test('spacing and dragging survive refresh while live packets keep their routes
   await expect.poll(() => stage.getAttribute('data-view-tilt').then(Number)).toBeCloseTo(Math.PI / 4, 3);
   const code = Object.keys(first.centres)[0]!;
   const point = await page.evaluate(code => (window as unknown as { regionHandles: Record<string, { x: number; y: number }> }).regionHandles[code]!, code);
+  expect(point).toBeTruthy(); expect(Number.isFinite(point.x) && Number.isFinite(point.y)).toBe(true);
   const camera = await stage.getAttribute('data-view-center');
   const touch = info.project.name !== 'desktop' ? await context.newCDPSession(page) : null;
   if (touch) {
@@ -103,7 +104,7 @@ test('spacing and dragging survive refresh while live packets keep their routes
   expect(page.url()).toContain('/netgraph/');
 });
 
-test('checkbox regions filter topology, search and Follow and retain their device selection', async ({ page }, info) => {
+test('checkbox regions filter topology, search and Follow and retain their device selection @regions', async ({ page }, info) => {
   await fixture(page); await page.emulateMedia({ reducedMotion: 'reduce' }); await page.goto('/netgraph/');
   const stage = page.locator('#netgraph-stage'); await expect(stage).toHaveAttribute('data-render-state', 'idle');
   await page.locator('#find-button').click(); await page.locator('#node-search').fill('Visual Charlie');
diff --git a/web/src/netgraph/regionControls.ts b/web/src/netgraph/regionControls.ts
index a367145..d01e64c 100644
--- a/web/src/netgraph/regionControls.ts
+++ b/web/src/netgraph/regionControls.ts
@@ -5,7 +5,7 @@ export function mountRegionControls(graph: NetgraphRenderer, host: HTMLElement,
   const stage = document.getElementById('netgraph-stage')!;
   const navigate = () => stage.dispatchEvent(new Event('graphnavigate'));
   const measure = () => document.documentElement.style.setProperty('--graph-controls-bottom', `${Math.ceil(host.getBoundingClientRect().bottom)}px`);
-  const resize = new ResizeObserver(measure); resize.observe(host);
+  const resize = typeof ResizeObserver === 'function' ? new ResizeObserver(measure) : undefined; resize?.observe(host);
   window.addEventListener('resize', measure); measure();
   const menu = graphTemplate<HTMLDetailsElement>('graph-regions-ui');
   const summary = menu.querySelector('summary')!, search = menu.querySelector('input')!, list = menu.querySelector<HTMLElement>('.region-checks')!;
@@ -70,5 +70,5 @@ export function mountRegionControls(graph: NetgraphRenderer, host: HTMLElement,
     }
   }
   sync();
-  return { sync, destroy() { resize.disconnect(); window.removeEventListener('resize', measure); document.removeEventListener('pointerdown', dismiss); menu.remove(); routes.remove(); layout.remove(); } };
+  return { sync, destroy() { resize?.disconnect(); window.removeEventListener('resize', measure); document.removeEventListener('pointerdown', dismiss); menu.remove(); routes.remove(); layout.remove(); } };
 }