diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..a1662fd
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    name: test (${{ matrix.os }}, py${{ matrix.python-version }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        python-version: ["3.11", "3.12"]
+
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+
+      - name: Install WebVac with test dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e ".[dev]"
+
+      - name: Run the unit test suite
+        run: python -m pytest tests -q
+
+      - name: Install Patchright Chromium
+        run: python -m patchright install chromium
+
+      - name: Smoke-check the CLI (doctor preflight)
+        run: python -m webvac --doctor
diff --git a/webvac/data/storage.py b/webvac/data/storage.py
index 62b6f3f..251b8c4 100644
--- a/webvac/data/storage.py
+++ b/webvac/data/storage.py
@@ -554,6 +554,25 @@ def _save_html(
             og_rows   = "".join(f"<tr><td>{self._esc(k)}</td><td>{self._esc(str(v))}</td></tr>" for k,v in og.items() if v)
             tc_rows   = "".join(f"<tr><td>{self._esc(k)}</td><td>{self._esc(str(v))}</td></tr>" for k,v in tc.items() if v)
 
+            # Tab buttons are built outside the f-string: Python 3.11 cannot
+            # parse a backslash inside an f-string expression (PEP 701 is 3.12+).
+            forms_tab_btn = ""
+            if forms:
+                forms_tab_btn = (
+                    "<button class='tab-btn' onclick=\"switchTab(this, 'forms-"
+                    + str(i)
+                    + "')\">Forms ("
+                    + str(len(forms))
+                    + ")</button>"
+                )
+            contact_tab_btn = ""
+            if emails or phones or social:
+                contact_tab_btn = (
+                    "<button class='tab-btn' onclick=\"switchTab(this, 'contact-"
+                    + str(i)
+                    + "')\">Contact</button>"
+                )
+
             page_cards += f"""
             <div class="page-card" id="page-{i}" style="display:none">
                 {og_img_html}
@@ -583,9 +602,9 @@ def _save_html(
                     <button class="tab-btn active" onclick="switchTab(this, 'content-{i}')">Content</button>
                     <button class="tab-btn" onclick="switchTab(this, 'links-{i}')">Links ({len(links)})</button>
                     <button class="tab-btn" onclick="switchTab(this, 'images-{i}')">Images ({len(images)})</button>
-                    {"<button class='tab-btn' onclick=\"switchTab(this, 'forms-" + str(i) + "')\">Forms (" + str(len(forms)) + ")</button>" if forms else ""}
+                    {forms_tab_btn}
                     <button class="tab-btn" onclick="switchTab(this, 'meta-{i}')">Meta / SEO</button>
-                    {"<button class='tab-btn' onclick=\"switchTab(this, 'contact-{i}')\">Contact</button>" if (emails or phones or social) else ""}
+                    {contact_tab_btn}
                 </div>
 
                 <div class="tab-panel" id="content-{i}">