Conclusion

(gentle instrumental music)…- [Instructor] So in conclusion,…we've learned that CSS is a critical part…of UI application development.…CSS is a mark up language…which describes the presentational structure of our UI.…We used the create-react-app generator…to produce React projects.…Inside of that generator is a package called react-scripts.…We can create a copy of this package, customize it,…and that utilize that copy, our customized version,…in new projects that we create.…

The postcss-preset-env package…utilizes the browserslist configuration…to determine which poly fills we're going to need…in terms of being able to support…newer CSS features in older browsers.…When we produce a production build,…an optional source map can be generated…for our CSS code for debugging purposes.…And we learned that testing Microsoft's web browsers,…Internet Explorer and Edge can be done…by downloading freely available virtual machines…and then setting up a host guest private network…on our machine so that we can view our web pages…