15. hide, show, toggle and isVisible
zz( '.t15-1' ).hide()
Must be hided
Must be hided
zz( '.t15-2' ).show()
Must be shown
Must be shown
'.t15-3' is visible: zz( '.t15-3' ).toggle()
Must be toggled
Must be toggled
'.t15-4' is NOT visible: zz( '.t15-4' ).toggle()
Must be toggled
Must be toggled
zz( '.t15-5' ).isVisible()
Is visible
Is visible
zz( '.t15-6' ).isVisible()
Is NOT visible
Is NOT visible
'#t15-7-1' is visible and '#t15-7-2' is NOT visible: zz( '.t15-3' ).toggle()
Must be toggled
Must be toggled