Adobe Dreamweaver CC 2014 v.13 - Manual (Page 219)

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Note:
To identify the page elements associated with a CSS Selector, hover your mouse over the Selector in Live View (with Live Code 'off').
Dreamweaver highlights the associated elements with dotted lines.
To lock-in the highlight for the elements, click the Selector. The elements now are highlighted with a blue border.
To remove the blue highlight around the elements, the Selector again.
The following table summarizes the scenarios where Live Highlight is not available.
Disable Live Highlight
Live Highlight is enabled by default. To disable Live Highlight, click Live View options in Document Toolbar and click Disable Live Highlight.
Mode Live Code Live Highlight displayed?
Code NA NA
Design NA NA
Live
ON
(button is pressed)
No
OFF Yes
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