The tab consists of three panes: Structure, Text, and Scripts.
The Structure pane shows the HTML DOM structure of the page that is currently active in the browser. The structure is updated dynamically according to the changes made on the page.
The Text pane shows HTML source code of the page that is currently active in th browser. The code is updated dynamically according to the changes made on the page.
The Scripts pane shows a tree of executed scripts.
The Structure and Text panes are mutually synchronized. When you click a node in the DOM structure, WebStorm scrolls through the contents of the Text pane.
The panes are also synchronized with the browser. WebStorm highlights the element in the browser as soon as you click the corresponding node in the DOM structure or in the Text pane.