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The Comprehensive ARIA Development Suite
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D C . i s F o c u s W i t h i n ( )
D e s c r i p t i o n : D e t e r m i n e s i f a n e l e m e n t c u r r e n t l y h a s f o c u s w i t h i n D C . c o n t a i n e r .
R e t u r n s : B o o l e a n : t r u e i f y e s , f a l s e o t h e r w i s e .
N o t e : T h e D C . i s F o c u s W i t h i n ( ) f u n c t i o n a l w a y s r e t u r n s a B o o l e a n v a l u e , e v e n w h e n c h a i n e d .
E x a m p l e :
v a r h a s F o c u s W i t h i n = D C . i s F o c u s W i t h i n ( ) ;