Merge branch 'master' into scrollbar_fixed

.github/workflows/Build_Test.yml

@@ -0,0 +1,33 @@
+name: Build and Test 
+
+
+on:
+
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+
+jobs:
+  build_test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x, 15.x, 16.x]
+
+
+    steps:
+
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm ci, build and test
+        run: |
+          npm ci
+          npm run build --if-present
+          npm test