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MDN111

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  1. Hello again, Many thanks to justsomeguy and Hadien for the reply. Although I find it a rather weird behavior, I now understand what's happening. To solve my problem (which is to calculate the left en top of a popup-div on the basis of its width and height), I defined the properties inline in the div tag. It works in IE, FF and Chrome. Thanks again. Grtz, MDN111.
  2. 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.
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