Simplify the following text for a Grade 9 native English-speaking person.
Original: To reverse the default behavior , so that the details are initially hidden , the NavContent element can be declared with style = `` display : none ; '' .
Simplified: To reverse the default behavior , so that the details are initially hidden , use ( instead of ) in the outer div element . Do not add to the NavContent element , because that will make it impossible for users without Javascript to see the content .