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html - Problem with <input type='text' /> and <textarea> width

In the following code, both the INPUT and TEXTAREA elements render wider than they should. How can I limit them to 100% of the usable area within the div?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <style>
       .mywidth{ width:100%; }
    </style>
</head>
<body>
    <div style="border: 3px solid green; width: 100px;">
        <input class="mywidth" ><br />
        <textarea class="mywidth"></textarea><br />
        <div style="background-color: yellow;" class="mywidth">test</div>
     </div>
</body>
</html>

Note: If I remove the DOCTYPE, it renders as expected, with the INPUT, TEXTAREA and inner DIV all the same width and not going outside the containing DIV.

Update: Not withstanding the default borders on those elements, it still appears to render incorrectly in IE7.

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by (71.8m points)

I had this same problem. I used the box-sizing property mentioned here:

How can I make a TextArea 100% width without overflowing when padding is present in CSS?

Here's what it looked like for me:

<style>
   .mywidth{ 
     width:100%;
     -moz-box-sizing: border-box;
     -ms-box-sizing: border-box;
     -webkit-box-sizing: border-box;
     box-sizing: border-box;
    } 
</style>

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