JAVASCRIPT

jquery if css property is

if( $("#selector").css('display') == 'block') {
  //Your code
}

check css property jquery

// select your element
var elem = jQuery('#elem');

// check the display property (just 1 example)
if (elem.css('display') != 'none')
{
 	console.log('elem display is NOT none') 
}
else
{
 	console.log('elem display IS none') 
}

// I hope that this helps! Happy coding :)