- Fix: Avoid errors occurring in Chrome now for supportsGoodTextCharPos

- Linting: Avoid Jamilih file in doc linting
- Testing: Add testcafe (ESLint plugin/rules, accessibility test
  (failing), ui test beginnings (passing))
- Docs: Add "Testing" prefix to contributing file
- npm: Bump to 3.0.0-rc.3

docs/Contributing.md

@@ -12,6 +12,7 @@
   - `Enhancement: `
   - `Refactoring: `
   - `Linting (<type>):` - Linting by type, e.g., "ESLint"
+  - `Testing:`
   - `Docs: `
   - `Update: ` - e.g., if updating a bundled library
   - `Build: `