JSFiddle - React, Tailwind, and code Playground

HTML

=
<div class="result"></div>
<div class="block one"></div>
<div class="block two"></div>

CSS

.block{
 height: 100px;
 width: 100px;
}
.one{
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: lightblue;
  &:before{
    content: '= a =';
    display: block;
    text-align: center;
  }
}
.two{
  &:before{
    content: '= b =';
    display: block;
    text-align: center;
  }
  position: absolute;
  top: 50px;
  right: 20px;
  background-color: lime;
}
.current_target{
  color: red;
}

JavaScript

function redraw( event, ui ) {
  $(this).html(
    'x : '+$(this).offset().left+'<br>'+
    'y : '+$(this).offset().top+'<br>'+
    'height: '+$(this).outerHeight()+'<br>'+
    'width : '+$(this).outerWidth())
    .data('coordinates',{
      x: $(this).offset().left,
      y: $(this).offset().top,
      height: $(this).outerHeight(),
      width: $(this).outerWidth()
    });
  var a = $('.one').data('coordinates');
  var b = $('.two').data('coordinates');
  
  $('.first_chapter').text('(( a.y: ' + a.y + ' + a.h: ' + a.height + ' ) < ( b.y: ' + b.y + ' ))')
    .css('color',(((a.y + a.height) < (b.y))?'green':'red'));
  $('.second_chapter').text('( a.y: ' + a.y + ' > ( b.y: ' + b.y + ' + b.h: ' + b.height + ' ))')
    .css('color',((a.y > (b.y + b.height))?'green':'red'));
  $('.third_chapter').text('(( a.x: ' + a.x + ' + a.w: ' + a.width + ') < b.x: ' + b.x + ')')
    .css('color',(((a.x + a.width) < b.x)?'green':'red'));
  $('.fourth_chapter').text('( a.x: ' + a.x + ' > ( b.x: ' + b.x + ' + b.w: ' + b.width + ' ))')
    .css('color',((a.x > (b.x + b.width))?'green':'red'))
    if (isCollide(a, b))
      alert('БУМ')
        
}
function isCollide(a, b) {
    return !(
        ((a.y + a.height) < (b.y)) ||
        (a.y > (b.y + b.height)) ||
        ((a.x + a.width) < b.x) ||
        (a.x > (b.x + b.width))
    );
}
$(function (){
  $('.block').draggable({
    drag: redraw
  }).each(function(){ 
 
  });
});