Add inline comments for lazy loading

Author: kaizau

open-in-web-browser.html

@@ -5317,6 +5317,7 @@ <h4>Front-End Communities</h4>
   <script src="assets/jquery-3.3.1.slim.min.js"></script>
   <script src="assets/lozad-1.14.0.min.js"></script>
   <script>
+      // Lazy load images that have [data-src]
       var observer = lozad('[data-src]');
       observer.observe();
 

open-in-web-browser_zh-CN.html

@@ -5314,6 +5314,7 @@ <h4>前端社区</h4>
   <script src="assets/jquery-3.3.1.slim.min.js"></script>
   <script src="assets/lozad-1.14.0.min.js"></script>
   <script>
+      // Lazy load images that have [data-src]
       var observer = lozad('[data-src]');
       observer.observe();