Replace unmaintained mocha-chrome with @web/test-runner. This gets us

coverage with Chrome, Firefox, and Webkit, code coverage stats, and now we're
running on latest node, too.

Author: botandrose-machine

.github/workflows/ci.yml

@@ -11,10 +11,11 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '16'
           cache: 'npm'
       - name: Install dependencies
         run: npm install
+      - name: Install browsers
+        run: npx playwright install --with-deps
       - name: Run tests
-        run: npm test
+        run: npm run ci
 

.gitignore

@@ -1,2 +1,3 @@
 /node_modules/
-.idea
+/coverage
+.idea