docs: Adds Native-UI tray Fiddle example (#20526)

docs/fiddles/native-ui/tray/renderer.js

@@ -0,0 +1,35 @@
+const { ipcRenderer, shell } = require('electron')
+
+const trayBtn = document.getElementById('put-in-tray')
+const links = document.querySelectorAll('a[href]')
+
+let trayOn = false
+
+trayBtn.addEventListener('click', function (event) {
+  if (trayOn) {
+    trayOn = false
+    document.getElementById('tray-countdown').innerHTML = ''
+    ipcRenderer.send('remove-tray')
+  } else {
+    trayOn = true
+    const message = 'Click demo again to remove.'
+    document.getElementById('tray-countdown').innerHTML = message
+    ipcRenderer.send('put-in-tray')
+  }
+})
+// Tray removed from context menu on icon
+ipcRenderer.on('tray-removed', function () {
+  ipcRenderer.send('remove-tray')
+  trayOn = false
+  document.getElementById('tray-countdown').innerHTML = ''
+})
+
+Array.prototype.forEach.call(links, (link) => {
+  const url = link.getAttribute('href')
+  if (url.indexOf('http') === 0) {
+    link.addEventListener('click', (e) => {
+      e.preventDefault()
+      shell.openExternal(url)
+    })
+  }
+})