Change the opacity of all elements except one div

Question

I am trying to tag all elements on a webpage except one div. I was able to output all the elements with the following jQuery:

$('*').css('opacity', .3);

However, opacity seems to be a property that inherits from the parent elements, even if I explicitly set the opacity of the div to 1. Now I am drawing a space regarding any decisions, so can I help here?

Answer 1

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Answer 2

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 // Relatively position the div to highlight
 $('#myDiv').css({
  position: 'relative',
  top     : 0,
  left    : 0,
  zIndex  : 100
 });

 // Add overlay and make clickable
 var w = $(window).width();
 var h = $(window).height();
 var $overlay = $('<div/>', {
  'id': 'overlay',
  css: {
   position   : 'absolute',
   height     : h + 'px',
   width      : w + 'px',
   left       : 0,
   top        : 0,
   background : '#000',
   opacity    : 0.5,
   zIndex     : 99
  }
 }).appendTo('body');
 // Click overlay to remove
 $('#overlay').click(function(){
  $(this).remove();
 })

Answer 3

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Answer 4

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Answer 5

div. -. .

CSS, highlight, :

.highlight {
  outline: 9999px solid rgba(0,0,0,0.5);
}

Javascript div:

$('#mydiv').addClass('highlight');