JavaScript DHTML/Javascript Objects/implementation
"implementation" Example
<source lang="html4strict">
<html> <head> <script language="JavaScript"> function function1() {
var m = document.implementation.hasFeature("HTML"); alert("Implementation value: "+m);
} </script> </head> <body> <input type="button" value="Click here" onClick="function1();"> </body> </html>
</source>