For each JavaScript component, document which ECMAScript version is required for each feature

[domoscargin]

What

Add labels to our internal "JS component features" Trello board to show the minimum ECMAScript version each feature relies on.

We could also be more specific if features rely on a specific API or browser features.

Why

We recently documented the features of each of our components with the intention of defining our core features and principles for helping decide whether to gracefully degrade on certain older browsers.

We'd like some quantitive data to confirm our assumptions about where things might break, and inform future decisions on where to "cut the mustard".

Who needs to work on this

Developer

Who needs to review this

Developer

Done when

• Each card on the Trello board has been labelled with an ECMAScript version (eg: ES2017, ES2018)
• [optional] Cards that rely on a specific API or browser feature have been labelled as such
• These changes have been shared with the team

[domoscargin]

Since we have a pretty set approach to cutting the mustard, and we're pretty sure all the current component features are compatible with ES6 browsers, I'm going to set this one as done.