Improve front-end training

training/front-end/04-the-browser.md

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+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+## Table of Contents
+
+- [The browser](#the-browser)
+  - [Topics](#topics)
+    - [Reading and manipulating the DOM](#reading-and-manipulating-the-dom)
+    - [Events](#events)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+# The browser
+
+## Topics
+
+### Reading and manipulating the DOM
+
+### Events
+
+https://dmitripavlutin.com/javascript-event-delegation/