Return the clip property:
alert(document.getElementById("myImg").style.clip);
<!DOCTYPE html> <html> <body> <button type="button" onclick="myFunction()">Return the value of the clip property</button><br> <img id="myImg" style="position:absolute;clip:rect(0px,60px,200px,0px);" src="background1.png" width="400" height="332"> <p id="demo"></p> <script> function myFunction() {/*from w w w . j av a 2s . c om*/ document.getElementById("demo").innerHTML = document.getElementById("myImg").style.clip; } </script> </body> </html>