If you have come here looking for something like :first-of-class sorry, it still does not exist. But there is a way to make something similar using a little selector trick.
Ionic uses different visual styles for different elements like icons for each platform (for example in iOS the navbar title is centered while in Android it goes at the left), the idea is to get a much “native” feeling in each platform but sometimes you could need (or required to) use the same visual style for all platforms, for example
A little while ago I was assigned to develop an Hybrid App using Ionic 3 for read and comment PDF files and was requested to use PDF.js. It was kind of difficult at the beginning because almost all the (scarce) documentation does not show directly how to work with Webpack based projects. Let’s see how I did it.