<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Backgrounds Test: box-shadow in 3 sub-tests with inset and Npx 0px</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#the-box-shadow">
  <link rel="match" href="reference/box-shadow-041-ref.html">

  <meta content="" name="flags">

  <!--

  <shadow> = inset? && <length>{2,4} && <color>?

  A comma-separated pair of numbers in curly braces {A,B}
  indicates that the preceding type, word, or group occurs
  at least A and at most B times.

  A question mark (?) indicates that the preceding type,
  word, or group is optional (occurs zero or one times).

  The components of each <shadow> are interpreted as follows:

  1st <length>
    Specifies the horizontal offset
    of the shadow. A positive value draws a shadow that is offset to
    the right of the box, a negative length to the left.

  2nd <length>
    Specifies the vertical offset
    of the shadow. A positive value offsets the shadow down, a negative one up.

  4th <length>
    Specifies the spread distance.
    Positive values cause the shadow to expand in all directions
    by the specified radius.
    Negative values cause the shadow to contract.

  -->

  <style>
  div
    {
      background-color: rgba(0, 0, 255, 0.5);  /* semi-transparent blue */
      border: black double 18px;
      height: 36px;
      margin-bottom: 36px;
      width: 36px;
    }

  /* inset, Npx 0px, zero spread */
  div#sub-test7
    {
      box-shadow: inset 18px 0px rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
    }

  /* inset, Npx 0px, positive spread */
  div#sub-test8
    {
      box-shadow: inset 18px 0px 0px 12px rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
    }

  /* inset, Npx 0px, negative spread */
  div#sub-test9
    {
      box-shadow: inset 18px 0px 0px -6px rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
    }
  </style>

  <h3>With inset and Npx 0px: 18px 0px</h3>

  <div id="sub-test7"></div>

  <div id="sub-test8"></div>

  <div id="sub-test9"></div>