diff --git a/.gitea/workflows/validate.yml b/.gitea/workflows/validate.yml
new file mode 100644
index 0000000..84a2a12
--- /dev/null
+++ b/.gitea/workflows/validate.yml
@@ -0,0 +1,26 @@
+name: Validate HTML site
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Install Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+
+    - name: Install dependencies
+      run: npm install htmlhint --save-dev
+
+    - name: Check HTML syntax
+      run: npx htmlhint "**/*.html"
+      continue-on-error: true