Adobe Dreamweaver CC 2015 - Manual (Page 206)

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CSS
Last updated 6/3/2015
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.
Note: The following table summarizes the scenarios where Live Highlight is not available.
Mode Live Code Live Highlight displayed?
Code NA NA
Design NA NA
Live ON (button is pressed) No
OFF Yes