:

  (solve) : right: auto
  +
      0px : margin-right
  +
      0px : border-right-width
  +
      0px : padding-right
  +
     80px : width
  +
      0px : padding-left
  +
      0px : border-left-width
  +
      0px : margin-left
  +
     80px : left: auto: set to static position
    =====================
    320px : width of containing block

And so computed right value must be 160px .
*/

  ]]></style>

 </head>

 <body>

  <p><img src="support/pass-cdts-abs-pos-non-replaced.png" width="246" height="3