NFC vCard

Yes, iPhone 7, 8, X with iOS11 (released in September 2017) feature a NFC reader API for NDEF records. (No write support and no arbitrary tag type support, just NDEF read.)

I'd like to have NFCTag.js listed. Should I open a pull request?
Since NFCTag.js implements write support, it opens up additional possibilities. In theory you could download code to a Puck using NFC...

I've come up with an additional example:

var data = new Uint8Array(16+768);
data.set("\xE1\x11\x60\x00", 0x0C);
var tag = require("NFCTag").create(data);

This code creates an empty tag with 768 bytes of writable storage.

The data can be initialized with an Android App, i.e.
https://play.google.com/store/apps/details?id=com.nxp.nfc.tagwriter