diff --git a/.github/workflows/page.yml b/.github/workflows/page.yml
index 558d314..45fb2de 100644
--- a/.github/workflows/page.yml
+++ b/.github/workflows/page.yml
@@ -1,29 +1,75 @@
 name: page CI
-
-on:
-  push:
-    branches:
-      - master
+on: [push, pull_request]
 
 jobs:
-  build-and-deploy:
-    name: Build and Deploy
+  test:
+    name: Run tests
     runs-on: ubuntu-latest
-
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v2
-
-      - name: Install Rust
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-
-      - name: Build the Rust book
-        run: |
-          cargo install mdbook
-          mdbook build
-
+    - uses: actions/checkout@master
+    - name: Update rustup
+      run: rustup self update
+    - name: Install Rust
+      run: |
+        rustup set profile minimal
+        rustup toolchain install 1.57 -c rust-docs
+        rustup default 1.57
+    - name: Install mdbook
+      run: |
+        mkdir bin
+        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.14/mdbook-v0.4.14-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+        echo "$(pwd)/bin" >> ${GITHUB_PATH}
+    - name: Report versions
+      run: |
+        rustup --version
+        rustc -Vv
+        mdbook --version
+    - name: Run tests
+      run: mdbook test
+  lint:
+    name: Run lints
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Update rustup
+      run: rustup self update
+    - name: Install Rust
+      run: |
+        rustup set profile minimal
+        rustup toolchain install nightly -c rust-docs
+        rustup override set nightly
+    - name: Install mdbook
+      run: |
+        mkdir bin
+        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.14/mdbook-v0.4.14-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+        echo "$(pwd)/bin" >> ${GITHUB_PATH}
+    - name: Install aspell
+      run: sudo apt install aspell
+    - name: Install shellcheck
+      run: sudo apt install shellcheck
+    - name: Report versions
+      run: |
+        rustup --version
+        rustc -Vv
+        mdbook --version
+        aspell --version
+        shellcheck --version
+    - name: Shellcheck
+      run: find . -name '*.sh' | xargs shellcheck
+    - name: Spellcheck
+      run: bash ci/spellcheck.sh list
+    - name: Lint for local file paths
+      run: |
+        mdbook build
+        cargo run --bin lfp src
+    - name: Validate references
+      run: bash ci/validate.sh
+  deploy:
+    if: ${{ github.ref == 'refs/heads/master' }}
+    name: Deploy
+    runs-on: ubuntu-latest
+    needs: [test, lint]
+    steps:
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         with: