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Last active Sep 22, 2020
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A polyfill for `button type="share"`
/* Use <button type="share"> in your HTML.
Include this JavaScript in a <script> element on the same page or in an external script.
The script checks for three ways of sharing:
1. Native support for <button type="share">.
2. Support for the JavaScript Web Share API.
3. A mailto: link.
This will share the current URL and page title.
(function (win, doc) {
const testButton = doc.createElement('button');
if (testButton.type != 'share') {
win.addEventListener('click', function(ev) {
ev = ev || win.event;
let target =;
let button = target.closest('button[type="share"]');
if (button) {
const title = doc.querySelector('title').innerText;
const url = win.location.href;
if (navigator.share) {
navigator.share({ title: title, url: url });
} else {
}(this, this.document));
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