What is the best method to achieve a width of 100% for an element (textarea) that has unspecified borders and padding, while also including the borders and padding

Native borders for input controls in various browsers often look more visually appealing compared to those set with CSS. However, the thickness of these native borders and padding can vary across different browsers, making it difficult to predict beforehand. In this case, I want the width of a textarea to span 100% of the container element while accounting for these native borders and padding.

Below is the HTML code:

<div class="container">
  <div class="wrapper">
    <textarea rows="10" cols="42">Some text</textarea>
  </div>
</div>

Accompanied by the following CSS:

.container {
  width: 400px;
}
textarea {
  width: 100%;
}

The issue arises when the textarea overflows the container on the right side by twice the pixel thickness of the native borders along with the padding. How can this overflow be resolved?

Introducing additional markup is acceptable if necessary, as are browser-specific CSS stylesheets, as long as they do not rely on assumptions about specific border thickness from particular browsers.

Is it feasible to achieve the desired 100% width using CSS in standard mode across all major browsers? This should ideally include compatibility with older browsers like IE6 and IE7, without relying on JavaScript (including expressions).

Answer №1

It's uncertain if I can provide you with a complete solution. I understand that you wish to maintain the original borders and padding, so this might not be the ideal fix for your issue.

Using the same markup:

<div class="container">
  <div class="wrapper">
    <textarea rows="10" cols="42">Some text</textarea>
  </div>
</div>

The CSS code snippet remains consistent:

.container
{
  width: ABCpx;
}

.wrapper
{
  padding: 3px;
}

textarea
{
  border-width: 1px;
  margin: -3px;
  padding: 2px;
  width: 100%;
}

Answer №2

If you want to achieve this effect, CSS3 can help, but keep in mind it may not work for IE6 or IE7. I haven't tested it on IE8, but there are claims that it works.

Using "CSS2.1" might not be the best approach. I look forward to the day when we can freely use these features without compatibility concerns.

<!DOCTYPE html>
<html
   <head>

<style type="text/css">

.measure {
  width: 400px;
  background: blue;
}
.container {
  width: 400px;
  background: red;
}
textarea {
  width: 100%;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  -ms-box-sizing: border-box;
  box-sizing: border-box;
}


</style>
</head>

<body>

<div class="measure">
  &nbsp;
</div>
<div class="container">
  <div class="wrapper">
    <textarea rows="10">Some text</textarea>
  </div>
</div>

Answer №3

If you're looking to troubleshoot and resolve your issue, this snippet of code may help:

<!DOCTYPE html>
<html>
<head>
    <title>My Page</title>
    <style type="text/css">
        .form-wrapper {
            width: 600px;
        }
        textarea {
            background: #333; 
            border: 1px solid #f00; 
            color: #fff;
            padding: 10px; 
            height: 200px; 
            width: 100%;
            -moz-box-sizing: border-box;
            -webkit-box-sizing: border-box;
            -ms-box-sizing: border-box;
            box-sizing: border-box;}
    </style>
</head>
<body>
    <div class="form-wrapper">
        <textarea rows="10" cols="35">Enter Description</textarea>
    </div>
</body>
</html>

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