title: Get top coordinate of self --> calc(100vh - y)
body: <p>I have an element and I want it to occupy all the space below it up to the bottom of the browser window.</p>
  
  <p>can I somehow get the y offset of the element for this? I don't know how to define y:</p>
  
  <pre><code>.occupy-space-below {
      max-height: calc(100vh - y);
  }
  </code></pre>