Activates conditional compilation support.
The **@cc\_on** statement activates conditional compilation in the scripting engine.
It is strongly recommended that you use the **@cc\_on** statement in a comment, so that browsers that do not support conditional compilation will accept your script as valid syntax:
/*@cc_on*/ ... (remainder of script)
Alternatively, an **@if** or **@set** statement outside of a comment also activates conditional compilation.