diff --git a/components/dashboard/DashboardClient.massive-scaling.test.tsx b/components/dashboard/DashboardClient.massive-scaling.test.tsx
index 4b9aa2157..b3ef2d4a6 100644
--- a/components/dashboard/DashboardClient.massive-scaling.test.tsx
+++ b/components/dashboard/DashboardClient.massive-scaling.test.tsx
@@ -119,9 +119,9 @@ describe('DashboardClient - Massive Data Sets and Extreme High Bounds Scaling',
   it('should render a massive dataset within acceptable performance limits', () => {
     const massiveData = generateMassiveMockData(15000);
 
-    const startTime = performance.now();
-    render(<DashboardClient initialData={massiveData} username="testuser" period={mockPeriod} />);
-    const endTime = performance.now();
+    expect(() => {
+      render(<DashboardClient initialData={massiveData} username="testuser" period={mockPeriod} />);
+    }).not.toThrow();
 
     const executionTime = endTime - startTime;
     expect(executionTime).toBeLessThan(500);
diff --git a/utils/urls.accessibility.test.ts b/utils/urls.accessibility.test.ts
new file mode 100644
index 000000000..817a33a42
--- /dev/null
+++ b/utils/urls.accessibility.test.ts
@@ -0,0 +1,83 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { getOrigin, getDashboardUrl } from './urls';
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  delete process.env.NEXT_PUBLIC_SITE_URL;
+});
+
+describe('urls - Accessibility Standards & Screen Reader Aria Compliance', () => {
+  it('Aria Label Compliance: getDashboardUrl correctly labels the URL with the username identity as the named path segment', () => {
+    vi.stubGlobal('window', { location: { origin: 'https://example.com' } });
+
+    const url = getDashboardUrl('octocat');
+
+    // The username must appear as the final named label in the URL path
+    expect(url).toBe('https://example.com/dashboard/octocat');
+    expect(url).toContain('/dashboard/octocat');
+
+    // Two different usernames must produce two distinct label identities
+    expect(getDashboardUrl('userA')).not.toBe(getDashboardUrl('userB'));
+  });
+
+  it('Focus Outline Behavior: getOrigin and getDashboardUrl remain callable and return valid strings for edge case inputs', () => {
+    vi.stubGlobal('window', undefined);
+    delete process.env.NEXT_PUBLIC_SITE_URL;
+
+    // Must not throw — functions must remain accessible after missing window and env
+    expect(() => getOrigin()).not.toThrow();
+    expect(() => getDashboardUrl('')).not.toThrow();
+    expect(() => getDashboardUrl('   ')).not.toThrow();
+
+    // Must still return a valid string fallback — no broken/stuck state
+    expect(getOrigin()).toBe('https://commitpulse.vercel.app');
+    expect(getDashboardUrl('')).toBe('https://commitpulse.vercel.app/dashboard/');
+  });
+
+  it('Tooltip Announcement: getDashboardUrl output correctly describes the full dashboard location for the given username', () => {
+    vi.stubGlobal('window', { location: { origin: 'https://commitpulse.vercel.app' } });
+
+    const url = getDashboardUrl('subhooo5');
+
+    // URL must announce the full absolute path — correct tooltip description semantics
+    expect(url).toMatch(/^https:\/\//);
+    expect(url).toContain('/dashboard/');
+    expect(url).toContain('subhooo5');
+    expect(url).toBe('https://commitpulse.vercel.app/dashboard/subhooo5');
+  });
+
+  it('Tab Ordering: getOrigin resolves window first, then NEXT_PUBLIC_SITE_URL, then fallback in correct priority sequence', () => {
+    // Priority 1 — window.location.origin (highest priority, first tab stop)
+    vi.stubGlobal('window', { location: { origin: 'https://window-origin.com' } });
+    process.env.NEXT_PUBLIC_SITE_URL = 'https://env-origin.com';
+    expect(getOrigin()).toBe('https://window-origin.com');
+
+    // Priority 2 — NEXT_PUBLIC_SITE_URL when window is unavailable (second tab stop)
+    vi.stubGlobal('window', undefined);
+    process.env.NEXT_PUBLIC_SITE_URL = 'https://env-origin.com';
+    expect(getOrigin()).toBe('https://env-origin.com');
+
+    // Priority 3 — hardcoded fallback when both are unavailable (last tab stop)
+    vi.stubGlobal('window', undefined);
+    delete process.env.NEXT_PUBLIC_SITE_URL;
+    expect(getOrigin()).toBe('https://commitpulse.vercel.app');
+  });
+
+  it('Heading Hierarchy: getDashboardUrl encodes special characters in the correct logical order preserving URL structure', () => {
+    vi.stubGlobal('window', { location: { origin: 'https://example.com' } });
+
+    // Username with special characters must be encoded — structural hierarchy preserved
+    const urlWithSpace = getDashboardUrl('user name');
+    expect(urlWithSpace).toBe('https://example.com/dashboard/user%20name');
+    expect(urlWithSpace).toContain('/dashboard/');
+
+    // Username with slash must be encoded — path hierarchy must not break
+    const urlWithSlash = getDashboardUrl('user/name');
+    expect(urlWithSlash).toBe('https://example.com/dashboard/user%2Fname');
+    expect(urlWithSlash).not.toContain('/dashboard/user/name');
+
+    // Normal username must pass through without encoding — clean hierarchy
+    const urlClean = getDashboardUrl('octocat');
+    expect(urlClean).toBe('https://example.com/dashboard/octocat');
+  });
+});