backgroundPosition with percent/number is not working #4201

Let's say you have a background image, and you try to apply backgroundPosition through css. The following is working:

background-position: center;

However, neither of these is:

background-position: 50%;
background-position: 50;
background-position: 0.5;

I'm attaching a stripped version of groceries. The app/groceries/groceries.component.html contains a single GridLayout with a backgroundImage and class - list-page. The list-page class is defined in app.css.

Related to NativeScript/nativescript-dev-webpack#135

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