diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..57649d4
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+++ b/.github/workflows/ci.yml
@@ -0,0 +1,39 @@
+# https://docs.github.com/en/actions/tutorials/build-and-test-code/nodejs#example-using-yarn
+# https://github.com/actions/setup-node
+name: ci
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+jobs:
+  ci:
+    strategy:
+      fail-fast: false
+      matrix:  # Currently Node.js [20.x, 22.x, 24.x]
+        os: [macos-latest, ubuntu-latest, windows-latest]
+        node-version: [lts/-2, lts/-1, lts/*]
+        exclude:
+          - os: ubuntu-latest
+            node-version: lts/*
+    runs-on: ${{ matrix.os }}
+    steps:
+      - if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libx11-dev libxtst-dev
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ matrix.node-version }}
+          # cache: 'yarn'
+      - run: yarn
+      # - run: yarn test
+      # - run: node test/test.js
+      # - run: node test/active.js
+      # - run: node test/all.js
+      # - run: node test/bounds.js
+      # - run: node test/click.js
+      # - run: node test/focus.js
+      # - run: node test/keyboard.js
+      # - run: node test/running.js
+      # - run: node test/state.js