We have a number of polyfills in the scripts folder namely html5shiv.js, respond.js, and placeholder.js. Let's combine these scripts into a single file.

First, create a new JavaScript file named polyfills.js that will hold the content of those polyfill scripts.

Open polyfills.js in Sublime Text.

Add the following lines to import the polyfill scripts:

// @koala-prepend "html5shiv.js"
// @koala-prepend "respond.js"
// @koala-prepend "placeholder.js"

In Koala, select polyfills.js, and click on the Compile button, as shown in the following screenshot:

By this step, Koala will have generated the minified file named polyfills.min.js.

Open index.html, and link polyfills.js before...