יוזר אגנטס סלקטור ב CSS

html[data-useragent*='Chrome/40.0'] body {
    background-color: tan;
}
html[data-useragent*='Firefox/35.0'] body {
    background-color: salmon;
}
html[data-useragent*='Safari/600.3'] body {
    background-color: deepskyblue;
} 
html[data-useragent*='Android'] body {
    background-color: silver;
}
html[data-useragent*='Android/2.1'] body {
    background-color: peachpuff;
}
html[data-platform*='MacIntel']  {
    border-top: 1em solid khaki;
}
html[data-platform*='Win32']  {
    border-top: 1em solid blue;
}
html[data-platform*='Win16']  {
    border-top: 1em solid green;
}
html[data-platform*='WinCE']  {
    border-top: 1em solid black;
} 
html[data-platform*='Linux i686']  {
    border-top: 1em solid teal;
}
html[data-platform*='Linux armv7l']  {
    border-top: 1em solid darkturquoise;
}
html[data-platform*='Mac68K']  {
    border-top: 1em solid lime;
}
html[data-platform*='MacPPC']  {
    border-top: 1em solid cyan;
}
html[data-platform='iPad'] body {
    background-color: limegreen;
} 
html[data-platform='iPhone'] body {
  background-color: #a0b99d;
}
/* combine useragent and platform selector */
html[data-useragent*='Chrome/40.0'][data-platform='MacIntel'] h1 {
  font-size: 5em;
}
html[data-useragent*='Firefox'][data-platform='MacIntel'] h1 {
   background-color: limegreen;
}

html[data-useragent*='NT 6.0']  {
    border-top: 1em solid seagreen;
}/* Windows Vista? */
.touch h1::after {
  content: "toch device detected" ;
  position: absolute; 
  top: 100%;
  left: 0;right:0;
  font-size: 2em;
}
/* general */
h1 {
  font-family: AvenirNextCondensed-DemiBold, Corbel, "Myriad Pro", Myriad, "DejaVu Sans Condensed", "Lucida Grande", "Lucida Sans", "DejaVu Sans", Tahoma, Verdana, sans-serif;
  text-align: center;
  position: relative;
}
a {
  color: indigo;
  text-decoration: none;
}