Gets or sets information used to bind the value of a content attribute of a meta element to an HTTP response header.

http-equiv-attribute.html

* This example causes the browser to reload the document every two seconds.

    <meta http-equiv="refresh" content="2">

* This example sets the character set for the document.

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

* This example disables theme support for the document.

    <meta http-equiv="msthemecompatible" content="no">

* This example tells Internet Explorer to display a webpage in IE9 mode, if possible.
  chrome=1 means IE should use the Chrome rendering engine if installed.
  (Ref.: http://stackoverflow.com/questions/6771258/whats-the-difference-if-meta-http-equiv-x-ua-compatible-content-ie-edge-e)

    <meta http-equiv="X-UA-Compatible" content="IE=9">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">