Hello !
Here is my question:
I'm going to the HTML DOM Style Object chapter on http://www.w3schools.com/ en click on the property "left" and choose "Try it yourself". That leads me to http://www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_left . It is a code to shift a button 100px to the left. It works fine and I understand it. So far, so good.
Now I modify two lines of the code:
Firstly, in the style block, I add the property "left" and assign to it a value of "300px".
Secondly, I rule out the line "document.getElementById("b1").style.left="100px";" and replace it by "alert(document.getElementById("b1").style.left)".
See the joined screenshot.
In fact, all I want to do is to retrieve the value of the left-property and show it in the alert-box. I expect that the alert-box would display "300px" but it does not !!! The message of the alert-box is a null string (???).
What is wrong with my way of thinking ?
Grtz,
MDN111.