CodePen Embed - Visibility of Empty Inline Element

<html>
  <head>
    <meta charset="utf-8">
    <title>Inline example: Spans without content</title>
  </head>
  <body>
    <!-- Nothing will appear. -->
    <div id="container">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
    </div>
  </body>
</html>

body {
  font-family: Helvetica, sans-serif;
  line-height: 24px;
}

/* Span is an inline element, so it ignores any height and width set in CSS. */
span {
  background-color: royalblue;
  height: 100px; /* This is ignored! */
  width: 100px;  /* This is ignored! */
  margin: 10px;
}

This Pen is owned by vishnu prabhakar on CodePen.

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