diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e9e6e0c6c..d5cb93bd4 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -37,7 +37,7 @@ jobs:
           path: target
           key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}-${{ matrix.rust_version }}
       - name: Build
-        run: cargo build --verbose
+        run: cargo build --verbose --all --all-features
 
   test:
     runs-on: ubuntu-latest
@@ -68,7 +68,7 @@ jobs:
           path: target
           key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}-${{ matrix.rust_version }}
       - name: Run tests
-        run: cargo test --verbose
+        run: cargo test --verbose --all --no-fail-fast --all-features --all-targets
 
   clippy:
     runs-on: ubuntu-latest
@@ -97,7 +97,7 @@ jobs:
           path: target
           key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}-${{ matrix.rust_version }}
       - name: Run Clippy
-        run: cargo clippy --all-targets --all-features -- -D warnings
+        run: cargo clippy --all --tests -- -D warnings
 
   fmt:
     runs-on: ubuntu-latest
@@ -120,4 +120,4 @@ jobs:
           path: target
           key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}-stable
       - name: Run fmt
-        run: cargo fmt -- --check
+        run: cargo fmt --check --all
diff --git a/Makefile b/Makefile
index ac6defd1d..0e22aca8d 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ format:  ## Fix formatting and clippy errors
 test_unit:
 	source test-utils.sh ;\
 	section "Cargo test" ;\
-	cargo test --all --all-features
+	cargo test --verbose --all --no-fail-fast --all-features --all-targets
 
 test_clippy:
 	source test-utils.sh ;\
diff --git a/crates/gosub_html5/src/parser.rs b/crates/gosub_html5/src/parser.rs
index 90d297262..4e127874e 100644
--- a/crates/gosub_html5/src/parser.rs
+++ b/crates/gosub_html5/src/parser.rs
@@ -4245,8 +4245,20 @@ impl<'chars> Html5Parser<'chars> {
         match rel.as_str() {
             "stylesheet" => {
                 let href = attributes.get("href").unwrap();
-                let base_url = self.document.get().location.clone().unwrap();
-                let css_url = base_url.join(href).unwrap();
+                let css_url = match Url::parse(href) {
+                    Ok(url) => url,
+                    Err(_err) => {
+                        // Relative URL
+                        if self.document.get().location.is_some() {
+                            let binding = self.document.get();
+                            let base_url = binding.location.as_ref().unwrap();
+                            base_url.join(href).unwrap()
+                        } else {
+                            self.parse_error("link element without base url not supported yet");
+                            return;
+                        }
+                    }
+                };
                 println!("loading external stylesheet: {}", css_url);
 
                 if let Some(stylesheet) = self.load_external_stylesheet(CssOrigin::Author, css_url)