Why Doesn\'t `margin: 0 auto;` Center Elements in Internet Explorer 8 Standard Mode?-CSS Tutorial-php.cn

Why Doesn\'t `margin: 0 auto;` Center Elements in Internet Explorer 8 Standard Mode?

Barbara Streisand

Release： 2024-11-30 10:42:11

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Why Doesn't `margin: 0 auto;` Center Elements in Internet Explorer 8 Standard Mode?

Understanding the "margin: 0 auto;" Issue in Internet Explorer 8

In the realm of web development, achieving horizontal centering has been a persistent challenge. The "margin: 0 auto;" technique has long been a dependable solution, but its efficacy in Internet Explorer 8 (IE8) has raised questions.

Unexpected Behavior in IE8 Standard

When applying "margin: 0 auto;" to a block-level element, IE8 standard mode behaves inconsistently. In the example provided, a submit button fails to center, unlike in other browsers such as Firefox 3, Opera, Safari, Chrome, IE7, and IE8 compatibility mode.

Mystery and Undefined Behavior

This discrepancy has sparked debate about the correct behavior of browsers. According to some perspectives, all browsers handle the situation incorrectly. However, others argue that the button's width should be 100% in this case.

Resolving the Issue with DOCTYPE

Fortunately, the solution is as simple as adding the following line to the beginning of the HTML document:

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

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This declaration defines the document's type and ensures that IE8 renders the elements as expected, and "margin: 0 auto;" centers the button as desired.

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