- Linting (ESLint): Replace innerHTML with textContent from old demo

- npm: Update devDeps (including core-js copy)

package.json

@@ -117,29 +117,30 @@
     "@cypress/code-coverage": "^1.10.4",
     "@cypress/fiddle": "^1.4.0",
     "@mysticatea/eslint-plugin": "^13.0.0",
-    "axe-core": "^3.4.0",
+    "axe-core": "^3.4.1",
     "babel-plugin-transform-object-rest-spread": "^7.0.0-beta.3",
     "coffeescript": "^2.4.1",
     "copyfiles": "^2.1.1",
-    "core-js-bundle": "^3.5.0",
+    "core-js-bundle": "^3.6.0",
     "cypress": "^3.8.0",
     "cypress-axe": "^0.5.3",
-    "eslint": "6.7.2",
-    "eslint-config-ash-nazg": "13.1.0",
-    "eslint-config-standard": "14.1.0",
+    "eslint": "^6.7.2",
+    "eslint-config-ash-nazg": "^14.0.1",
+    "eslint-config-standard": "^14.1.0",
     "eslint-plugin-array-func": "^3.1.3",
     "eslint-plugin-compat": "^3.3.0",
     "eslint-plugin-cypress": "^2.8.1",
     "eslint-plugin-eslint-comments": "^3.1.2",
     "eslint-plugin-html": "^6.0.0",
-    "eslint-plugin-import": "2.19.1",
+    "eslint-plugin-import": "^2.19.1",
     "eslint-plugin-jsdoc": "^18.4.3",
     "eslint-plugin-markdown": "^1.0.1",
+    "eslint-plugin-no-unsanitized": "^3.0.2",
     "eslint-plugin-no-use-extend-native": "^0.4.1",
-    "eslint-plugin-node": "10.0.0",
-    "eslint-plugin-promise": "4.2.1",
+    "eslint-plugin-node": "^10.0.0",
+    "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-sonarjs": "^0.5.0",
-    "eslint-plugin-standard": "4.0.1",
+    "eslint-plugin-standard": "^4.0.1",
     "eslint-plugin-unicorn": "^14.0.1",
     "frs-replace": "^2.0.1",
     "gh-badges": "^2.2.1",