The Mozilla Developer Network is a fantastic resource for finding out about browser compatibility issues especially when you are working with JavaScript.
I was reminded of this when I was trying to get Firefox 78 ESR (extended support release) to format time for me and I realized that it only supports the timeStyle option in version 79 or later.
So, for example, this snippet:
const date = new Date();
date.toLocaleTimeString('en', {timeStyle: 'short'});
produces different results in Firefox 78 and in Firefox 83.
Firefox 78 result:
Firefox 83 result:
As you can see, Firefox 78 will display seconds, but the newer version will adhere to the short time style and not display that field.
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