how to combine the Universal selector and Attribute selectors in CSS

Question

I need to meet this demand：Write your page so that if you hover over any element (ie any header, paragraph, image, etc), the element is highlighted in yellow.This must be a one-selector, one-property addition to your stylesheet -- no commas allowed! (Note: This is tricky.)

As the demand,this is tricky! Hope you can help me,THX~

Answer 1

i have used z-index and pseudo element :after

here is the js fiddle

Js Fiddle

  * { position:Relative; background: transparent; z-index:1; } *:hover:not(html):not(body):after { content:" "; background: yellow; display:block; position:absolute; top:0; bottom:0; right:0; left:0; z-index:-1; } 

 <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</p> <div>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</div> <h1><p>Lorem ipsum dolor</p></h1> 

Answer 2

You can use jQuery for this

$(document).ready(function(e){
      $('*').mouseenter(function(){
         $(this).css('background','yellow');
      }).mouseleave(function(){
         $(this).css('background','#fff')  
      });
 });