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    EDIT: Fixed 10/22/08. See post down below.

    Hi folks,
    I am currently developing a form and today, I came across the following problem: All (or rather most) of my form elements are supposed to have a width of 50% of their parent. There is also a border and a padding that (since I’m using XHTML) will make the element a little bigger in total. No problem. However, when I try to put a <select>, the browser makes it a little smaller. To me, it looks like 50% minus padding minus border. This is not expected behavior since it’s pretty much quirks-mode behavior.

    To cut a long story short, please have a look:
    EDIT: Fixed version: … orms.test3

    Any suggestions? Thanks a lot in advance!

    A desperate developer.


    Your DIV is missing a semicolon but I don’t think that would account for it. Nothing else jump out at me. Sorry.


    IE often doesn’t like WIDTH and PADDING being set in the same definition


    Try removing the padding and see if it makes any difference.


    I investigated a little more today… And came to the following conclusion: All browsers (except IE8) are doing it wrong, so it’s certainly not a bug, it must be a feature! :lol:

    Mozilla Developer Center claims the different behavior is "to emulate the behavior of browsers that do not correctly support the CSS box model specification". Nice way to express that IE is stupid. However, there are several CSS properties (every browser is using a different one, of course) that influence the different behavior.

    For more, go to:

    In fact, Firebug tells me that -moz-box-sizing is set to ‘content-box’ for a normal <input>; for <select>s the default seems to be ‘border-box’.

    Solved: … orms.test3

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