How to detect if web app running standalone on Chrome mobile

This answer comes with a huge delay, but I post it here just for other people who are struggling to find a solution.

Recently Google has implemented the CSS conditional display-mode: standalone, so there are two possible ways to detect if an app is running standalone:

Using CSS:

@media all and (display-mode: standalone) {
    /* Here goes the CSS rules that will only apply if app is running standalone */
}

Using both CSS and Javascript:

function isRunningStandalone() {
    return (window.matchMedia('(display-mode: standalone)').matches);
}
...
if (isRunningStandalone()) {
    /* This code will be executed if app is running standalone */
}

If you need more information, Google Developers has a page dedicated to this topic: https://developers.google.com/web/updates/2015/10/display-mode

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