The text within a textarea that is set to 100% width extends outside of its

I'm encountering an issue with a textarea (and potentially any input element) appearing too wide when the width is set to 100%. Below is my CSS code.

Firstly, I am resetting all styles.

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

Next step involves applying styles to my form.

form fieldset {
    border: none;
    border: 1px solid #ff0000;
    padding: 5px;
}
form fieldset legend {
    font-size: 20px;
    font-weight: bold;
}
form textarea {
    width: 100%;
    height: 500px;
}

Lastly, here is my HTML code.

<form method="post">
    <fieldset>
        <label for="area">Content</label>
        <textarea id="area" name="area"></textarea>
    </fieldset>
</form>

Upon testing in Chrome and Firefox (other browsers pending), the textarea appears properly padded by 5px on the left, but on the right side it either aligns flush with the fieldset or slightly overflows.

An interesting observation is that everything displays correctly when I remove the doctype from the page.

Answer №1

Even though both responses contain relevant information, they fail to provide a straightforward solution. The solution is simply to include the CSS rule box-sizing: border-box; for the textarea element, like this:

form textarea {
    width: 100%;
    box-sizing: border-box;
    height: 500px;
}

box-sizing: border-box; is compatible with all modern web browsers, including IE8 (excluding IE7), and ensures that the element's width calculation includes both border and padding.

By default, most browsers use content-box, which only considers the inner width of the element. While browsers often apply their own default border and padding styles to textarea, they may not always include box-sizing. This can lead to the width being distorted when set to width: 100%;, as it includes the parent's width along with the browser's default border and padding, resulting in an incorrect width for the parent container.

Answer №2

Make sure to include resetting the textarea in your CSS reset, as it seems to be missing.

It may be inheriting some margin from other styles.

Answer №3

The main issue stems from the notorious Internet Explorer box model bug, which can be further explored at this link.

When Internet Explorer is not in standard compliant mode (i.e., when the doctype is not specified), the width of an element includes its padding and margin. As a result, the textarea overflows.

To resolve this issue, try removing any margin or padding from the textarea either through your CSS or browser settings.

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