grid-level-01/example003.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Grid Example 3 (20151104 ED)</title>
<link type="text/css" rel="stylesheet" href="_baseline.css">
<style type="text/css">
#grid {border: 2px solid gray; padding: 1px; height: 10em; width: 50%;}

#track, #thumb {border: 0.25em solid rgba(60,96,140,1); padding: 0.25em; border-radius: 0.33em;}
#thumb {background: rgba(60,96,140,0.33);}

#lower-fill {background: maroon;}
#upper-fill {background: olive;}

/*
#grid div[id]::before {content: "[#" attr(id) "] ";}
*/
</style>
<style type="text/css" class="show">
#grid {
  display: grid;
  grid-template-columns:
    [start]        auto
    [track-start]  0.5fr
    [thumb-start]  auto
    [fill-split]   auto
    [thumb-end]    0.5fr
    [track-end]    auto
    [end];
}
#lower-label { grid-column-start: start }
#track       { grid-column: track-start / track-end; justify-self: center }
#upper-label { grid-column-end: end; }
#lower-fill  { grid-column: track-start / fill-split;
               justify-self: end;
               z-index: 5 }
#upper-fill  { grid-column: fill-split / track-end;
               justify-self: start;
               z-index: 5 }
#thumb       { grid-column: thumb-start / thumb-end; z-index: 10 }
</style>
</head>
<body>


<div id="grid">
  <div id="lower-label">Lower Label (0)</div>
  <div id="upper-label">Upper Label (50)</div>
  <div id="track">Track</div>
  <div id="lower-fill">Lower Fill</div>
  <div id="upper-fill">Upper Fill</div>
  <div id="thumb">Thumb</div>
</div>


<section id="reference">

<p>Reference rendering:</p>
<img src="refrends/example003.png" alt="">

</section>

</body>
</html>