Merge branch 'develop' into es-modules

Author: trusktr

build/build.js

@@ -85,6 +85,7 @@ async function buildAllPlugin() {
   var plugins = [
     {name: 'search', input: 'search/index.js'},
     {name: 'ga', input: 'ga.js'},
+    {name: 'gtag', input: 'gtag.js'},
     {name: 'matomo', input: 'matomo.js'},
     {name: 'emoji', input: 'emoji.js'},
     {name: 'external-script', input: 'external-script.js'},

docs/plugins.md

@@ -71,6 +71,8 @@ This plugin ignores diacritical marks when performing a full text search (e.g.,
 
 ## Google Analytics
 
+> Google's Universal Analytics service will no longer process new data in standard properties beginning July 1, 2023. Prepare now by setting up and switching over to a Google Analytics 4 property and docsify's gtag.js plugin.
+
 Install the plugin and configure the track id.
 
 ```html
@@ -91,6 +93,31 @@ Configure by `data-ga`.
 <script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/ga.min.js"></script>
 ```
 
+## Google Analytics 4 (GA4)
+
+Install the plugin and configure the track id.
+
+```html
+<script>
+  // Single ID
+  window.$docsify = {
+    gtag: 'UA-XXXXX-Y',
+  };
+
+  // Multiple IDs
+  window.$docsify = {
+    gtag: [
+      'G-XXXXXXXX', // Google Analytics 4 (GA4)
+      'UA-XXXXXXXX', // Google Universal Analytics (GA3)
+      'AW-XXXXXXXX', // Google Ads
+      'DC-XXXXXXXX', // Floodlight
+    ],
+  };
+</script>
+<script src="//cdn.jsdelivr.net/npm/docsify/lib/docsify.min.js"></script>
+<script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/gtag.min.js"></script>
+```
+
 ## Emoji
 
 Renders a larger collection of emoji shorthand codes. Without this plugin, Docsify is able to render only a limited number of emoji shorthand codes.