window.blur()

We can lost focus from a window by using blur() method. Here is the syntax
window.blur();
Once the focus is lost then the window will be minimized ( not closed ) .
To get the window again we have to use window.focus()

Check the status of the window focus by using document.hasFocus()

You can see the source code of above demo here
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Demo of blur and focus of a window</title>

<script language=javascript>

function to_close(){
tm.close();
}

function to_open(){
tm=window.open("moveby-child.htm","Ratting","width=250,height=150,left=150,0,top=200,status=0,");
}


function to_focus(){
tm.focus();   // Keeping the focus on small window
}

function to_blur(){
tm.blur();   // Keeping the focus out on small window
}
//////////////////
function display_c(){
var refresh=1000; // Refresh rate in milli seconds
mytime=setTimeout('display_msg()',refresh)
}

function display_msg() {
if ( document.hasFocus() ) {
document.getElementById('my_msg').style.backgroundColor = "#00f000";	
document.getElementById('my_msg').innerHTML = "This document is in Focus ";
}else{
document.getElementById('my_msg').style.backgroundColor = "#f07814";
document.getElementById('my_msg').innerHTML = "This document is NOT in Focus ";	
}
display_c();
 }

//////////////
</script>

</head>
<body onload=display_c();>
<br><br><input type="button" name="btn" value="Open child window" onclick="to_open()";>
<input type="button" name="btn" value="Close Child window" onclick="to_close()";>
<input type="button" name="btn" value="Focus child window" onclick="to_focus()";>
<input type="button" name="btn" value="Blur Child window " onclick="to_blur()";>
<br><br>
<span id=my_msg>Wait for Status here</span>

</body>
</html>
The code for child window is available at moveBy
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