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Why Doesn\'t \'margin: 0 auto;\' Center Input Elements in IE8 Standard Mode?
- DDDOriginal
- 2024-11-29 16:46:10448browse
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>
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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