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              <style type="text/css"> 
     html:not(.gss-ready) { opacity: 0; } 
  <style type="text/css"> html:not(.gss-ready) { opacity: 1; } 

   <div id="d1" class="darkbox"></div>
   <div id="d2" class="lightbox"></div>
   <div id="d3" class="lightbox"></div>
   <div id="d4" class="purplebox"></div>

<style type="text/gss">
  div {
    height: == 100;
  ingap == 10;
  //Try resizing the window to see the size inequality in action.
  @h |-(#d1(==100))-(#d2(>=100, <= 300))-(#d3(>= 50, <=400))-(#d4(<= 150))-| in(::window) gap(ingap);

<script src="https://s3-us-west-2.amazonaws.com/cdn.thegrid.io/gss/v2.0.0/v2.0.0/gss.js"></script>
 <script type="text/javascript">
  window.engine = new GSS(document);
body {
  font-family: "museo-sans",sans-serif;
  font-style: normal;
  font-weight: 500;
  color: white;
  margin: 0;

.darkbox {
  background-color: #7DB4B5;

.lightbox {
  background-color: red; 

.purplebox {
  background-color: #680148;
               //Feel free to explore what going on in the GSS engine!
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