Using a Web API from JavaScript is as simple as this:
and others) using an OPML file:
Украинцам запретили выступать на Паралимпиаде в форме с картой Украины22:58，这一点在新收录的资料中也有详细论述
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用，详情可参考新收录的资料
我們擁有更多隱私控制權，卻比以往任何時候都更缺乏隱私，详情可参考新收录的资料
It's perfectly valid to add input filtering on top of type=email if you want to further restrict the input set. Maybe you hate people with gmail addresses or only want to allow email addresses at your local firm (both examples from before!). In that case, having a more restrictive pattern makes sense.