Code View
Code View is grayed out in design phase

Code View

The code view is to support developer in writing code

 

Finding a matching tag

The match of <body> tag was found at line 18, column 7

Select tag

Find Matching Tag

From the code pane you while creating one page, where you think that a piece of code will be reused in your web application, you may choose to create a code snippet from the code pane for future uses. (Link)