diff --git a/src/index.css b/src/index.css
index c166d80..843c394 100644
--- a/src/index.css
+++ b/src/index.css
@@ -107,6 +107,9 @@ body {
   -webkit-app-region: drag;
   flex-shrink: 0;
   transition: padding-left 0.2s ease;
+  /* Chrome is not part of the document: keep it out of Select All / copy */
+  user-select: none;
+  -webkit-user-select: none;
 }
 
 /* Toolbar in fullscreen mode (no traffic lights) */
@@ -457,6 +460,9 @@ body {
   font-size: 12px;
   color: var(--text-muted);
   flex-shrink: 0;
+  /* Chrome is not part of the document: keep it out of Select All / copy */
+  user-select: none;
+  -webkit-user-select: none;
 }
 
 .status-left,
diff --git a/tests/e2e/select-all.spec.ts b/tests/e2e/select-all.spec.ts
new file mode 100644
index 0000000..5232186
--- /dev/null
+++ b/tests/e2e/select-all.spec.ts
@@ -0,0 +1,63 @@
+/**
+ * E2E Tests: Select All scoping
+ *
+ * Cmd+A uses Electron's native `selectAll` role, which dispatches Blink's
+ * SelectAll command across the whole document. The app chrome (toolbar and
+ * status bar) lives in the same document as the rendered markdown, so without
+ * `user-select: none` on the chrome its text is selected and copied too.
+ *
+ * These tests drive the same Blink command the menu role dispatches and assert
+ * on the serialized selection.
+ */
+import { test, expect } from './electron-app';
+
+const SAMPLE_MARKDOWN_HTML = '<h1>Sample Heading</h1><p>Body paragraph text.</p>';
+
+/**
+ * Render known content into the viewer, then run Blink's SelectAll and return
+ * the serialized selection.
+ */
+async function selectAllText(mainWindow: import('@playwright/test').Page): Promise<string> {
+  return mainWindow.evaluate((html) => {
+    const viewer = document.getElementById('markdown-viewer');
+    const content = document.getElementById('markdown-content');
+    if (!viewer || !content) throw new Error('viewer elements not found');
+
+    viewer.classList.remove('hidden');
+    document.getElementById('drop-zone')?.classList.add('hidden');
+    content.innerHTML = html;
+
+    window.getSelection()?.removeAllRanges();
+    document.execCommand('selectAll');
+
+    return window.getSelection()?.toString() ?? '';
+  }, SAMPLE_MARKDOWN_HTML);
+}
+
+test.describe('Select All', () => {
+  test('selects the markdown document content', async ({ mainWindow }) => {
+    await mainWindow.waitForSelector('.toolbar', { timeout: 5000 });
+    const selection = await selectAllText(mainWindow);
+
+    expect(selection).toContain('Sample Heading');
+    expect(selection).toContain('Body paragraph text.');
+  });
+
+  test('does not select status bar text', async ({ mainWindow }) => {
+    await mainWindow.waitForSelector('.status-bar', { timeout: 5000 });
+    const selection = await selectAllText(mainWindow);
+
+    expect(selection).not.toContain('Not watching');
+    expect(selection).not.toContain('No file');
+    expect(selection).not.toContain('100%');
+  });
+
+  test('does not select toolbar text', async ({ mainWindow }) => {
+    await mainWindow.waitForSelector('.toolbar', { timeout: 5000 });
+    const selection = await selectAllText(mainWindow);
+
+    // "Open" and "Edit" are toolbar button labels
+    expect(selection).not.toContain('Open');
+    expect(selection).not.toContain('Edit');
+  });
+});