HTML 5.2 W3C Recommendation
Key Points: Payment Request API allowpaymentrequest Presentation API allowpresentation iframe Ref: https://www.w3.org/TR/2017/REC-html52-20171214/index.html https://www.infoq.com/news/2017/12/html-5-2-recommendation http://www.infoq.com/cn/news/2018/01/html-5-2-recommendation https://jakearchibald.com/2017/es-modules-in-browsers/