wpt / css / CSS2 / visuren / fixed-pos-stacking-001.xht

Status: PASS | Duration: 12ms | Subtests: 1/1 | Open test on wpt.live | Open ref on wpt.live | wpt.fyi

TestRefTest SourceRef Source

/css/CSS2/visuren/fixed-pos-stacking-001.xht

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>CSS test: fixed positioning makes a stacking context</title>

    <link rel="help" href="http://www.w3.org/TR/CSS22/visuren.html#z-index" title="9.9.1 Specifying the stack level: the 'z-index' property" />
    <link rel="help" href="http://www.w3.org/TR/CSS22/changes.html#s.9.9.1" title="C.1 Changes since the Recommendation of 7 June 2011" />
    <meta name="assert" content="auto The stack level of the generated box in the current stacking context is 0. If the box has 'position: fixed' or if it is the root, it also establishes a new stacking context." />
    <link rel="match" href="fixed-pos-stacking-001-ref.xht" />
    <link rel="author" title="Bert Bos" href="mailto:bert@w3.org" />


    <style type="text/css">
      div {width: 5em; height: 2em}

      /* absolute with 'z-index: auto' does not create a stacking context */
      #absolute {position: absolute; left: 1em; top: 3em; background: green}
      #absolute div {position: absolute}
      #absolute div div {position: absolute; z-index: -1; background: red}

      /* fixed with 'z-index: auto' *does* create a stacking context */
      #fixed {position: fixed; left: 10em; top: 3em; background: red}
      #fixed div {position: absolute}
      #fixed div div {position: absolute; z-index: -1; background: green}
    </style>
  </head>

  <body>
    <p>There should be no red.</p>

    <div id="absolute">
      <div>
	<div></div>
      </div>
    </div>

    <div id="fixed">
      <div>
	<div></div>
      </div>
    </div>
  </body>
</html>

/css/CSS2/visuren/fixed-pos-stacking-001-ref.xht

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>CSS Reference File</title>
    <link rel="author" title="Bert Bos" href="mailto:bert@w3.org" />

    <style type="text/css">
      div {width: 5em; height: 2em}

      /* absolute with 'z-index: auto' does not create a stacking context */
      #absolute {position: absolute; left: 1em; top: 3em; background: green}
      #absolute div {position: absolute}
      #absolute div div {position: absolute; z-index: -1; background: green}

      /* fixed with 'z-index: auto' *does* create a stacking context */
      #fixed {position: fixed; left: 10em; top: 3em; background: green}
      #fixed div {position: absolute}
      #fixed div div {position: absolute; z-index: -1; background: green}
    </style>
  </head>

  <body>
    <p>There should be no red.</p>

    <div id="absolute">
      <div>
	<div></div>
      </div>
    </div>

    <div id="fixed">
      <div>
	<div></div>
      </div>
    </div>
  </body>
</html>