Entering the developer mode of a web page - three ways

1. What is developer mode: Tools used to debug web content such as HTML and JS are developer tools. Through the developer tools, we can see the HTML and JS of the web page, as well as the browser's network requests and CSS styles. memory usage etc.

2. Three ways to enter developer mode:

（1）ctrl+shift+i

（2）F12

(3) Click More Tools-Developer Tools-Enter Developer Mode