DelimiterFlashTime
 Usage
• DelimiterFlashTime is an option for cells and notebooks which specifies how long in seconds a delimiter should flash for when its matching delimiter is entered.
Notes
• DelimiterFlashTime->0 makes delimiters not flash. • A typical default setting is DelimiterFlashTime->0.3, which makes matching delimiters flash for 0.3 seconds. • Delimiters include parentheses, brackets and braces, as well as [[, ]] and (* and *), and paired special characters such as  ,  . • If you enter an unpaired closing delimiter the standard Mathematica front end will beep. • You can use the front end menu item Check Balance to select ranges with balanced delimiters in an expressions. • You can set DelimiterFlashTime at the level of a single cell, a notebook, or the whole front end. • New in Version 3.
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