Why Doesn\'t \'margin: 0 auto;\' Center Input Elements in IE8 Standard Mode?-CSS Tutorial-php.cn

Why Doesn\'t \'margin: 0 auto;\' Center Input Elements in IE8 Standard Mode?

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Release： 2024-11-29 16:46:10

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Why Doesn't

IE8 Discrepancy with "margin: 0 auto;" for Input Element

Despite its widespread use for element centering, the "margin: 0 auto;" property seems to exhibit inconsistent behavior in IE8. In a recent测试, an input element enclosed within a block element failed to center itself in IE8's standard mode.

The HTML code in question is as follows:

<div>

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Browser Compatibility

The issue of improper element centering in IE8 standard mode has been observed in numerous browsers, including:

Firefox 3
Opera
Safari
Chrome
IE7 compatibility mode

However, it is not present in IE8 standard mode.

Underlying Issue

The culprit behind this behavior is the fact that input elements are not inherently block-level elements. When "display: block" is applied to an input, it effectively transforms it into a block-level element, making the "margin: 0 auto;" property applicable.

Solution

To resolve this issue, developers can either explicitly set a width for the input element or contain it within a block-level element and apply "text-align: center" to the container.

Specification References

According to the CSS 2.1 specification:

"display: block" on a non-block-level element does not specify an explicit width.
"margin: 0 auto;" on a block-level element centers it horizontally within its parent element.

Therefore, the behavior of browsers that do not center the input element with "margin: 0 auto;" is incorrect according to the specifications.

Note: Adding a DOCTYPE declaration can solve the issue in some cases. Consider using the following:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

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