jquery – 为什么z-index忽略位置：static？

看到这个评论 from jquery-ui

// Ignore z-index if position is set to a value where z-index is ignored by the browser
// This makes behavior of this function consistent across browsers
// WebKit always returns auto if the element is positioned

我看到jquery的zIndex()如果元素是position：static则返回0.

位置上不支持z-index：static？ (它适用于我的Chrome,没有测试跨浏览器)

解决方法

因为position：static表示“忽略左,上,z-index等所有定位指令”.

'z-index'
Value:      auto | <integer> | inherit
Initial:    auto
Applies to:     positioned elements

– http://www.w3.org/TR/CSS21/visuren.html#z-index

An element is said to be positioned if its ‘position’ property has a value other than ‘static’.

– http://www.w3.org/TR/CSS21/visuren.html#positioned-element