webpack-dev-server
http://localhost:8080/webpack-dev-server/bundle

The app should display "It's working" with a dotted background.

There is no file named bundle in this directory. The dev server creates a simple html that executes a javascript file: bundle.js (<path>.js)

webpack-dev-server
http://localhost:8080/webpack-dev-server/index.html

The app should display "It's working" with a dotted background and a SVG image.

There is a file named index.html in this directory. This file is served as content

webpack-dev-server --config alternative.config.js
http://localhost:8080/webpack-dev-server/bundle
http://localhost:8080/webpack-dev-server/index.html

The app should be minimized and the image is included with a Data Url.

webpack-dev-server --inline
http://localhost:8080/index.html

The app without a webpack-dev-server frame. Console displays status messages.

The webpack-dev-server client is added to the entry point.

webpack-dev-server
http://localhost:8080/inlined.html

The app without a webpack-dev-server frame. Console displays status messages.

The webpack-dev-server client is added as script tag to the html page.

Try to update app.js, by uncommenting some lines.

The browser should reflect your changes.

You may also update the css file or any other file used by the app.

webpack-dev-server --inline --history-api-fallback --output-public-path /
http://localhost:8080/some/url/from/spa

The contents of /index.html is served.