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Maximum and minimum values of z-index_html/css_WEB-ITnose

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Jun 24, 2016 pm 12:03 PM

z-indexmaximum valueminimum value

浏览器	最大值	超过最大值后变成	最小值	小于最小值后变成	备注
IE6	2147483647	2147483647	-2147483648	-2147483648
IE7	2147483647	2147483647	-2147483648	-2147483648
IE8	2147483647	2147483647	-2147483648	-2147483648
IE9	2147483647	2147483647	-2147483648	-2147483648
IE10	2147483647	2147483647	-2147483648	-2147483648
IE11	2147483647	2147483647	-2147483648	-2147483648
Firefox 2	2147483647	元素消失	?	?
Firefox 3	2147483647	0	?	?
Firefox 29(最新稳定版)	2147483647	2147483647	-2147483648	-2147483648
Safari 3	16777271	16777271	?	?
Safari 4	2147483647	2147483647	?	?
Safari 5.1.7(最新稳定版)	2147483647	数值不变	-2147483648	数值不变	使用的是webkit内核，所以和chrome一致
Chrome 29	2147483647	2147483647	-2147483648	数值不变
Chrome 35(最新稳定版)	2147483647	数值不变	-2147483648	数值不变	chrome允许设置超过最大值、最小值的z-index，不过超出之后层叠样式会使用最大值和最小值来计算（比如设置为2147483648时，会以2147483647计算层叠关系）
Opera 9	2147483647	2147483647	？	？
Opera 21(最新稳定版)	2147483647	数值不变	-2147483648	数值不变	使用的是webkit内核，所以和chrome一致

结论：z-index的取值范围为-2147483648 ~~ 2147483647。而C的Int型数据类型的大小也为-2147483648 ~~ 2147483647。说明CSS的z-index在C中是作为INT型计算的。一般z-index都不超过100000，所以基本上不用考虑大小问题。PS:chrome中对于width和height的最大限制为33554428，这个有时间再做吧。参考文章：http://stackoverflow.com/questions/8565821/css-max-z-index-valuehttp://www.puidokas.com/max-z-index/http://stackoverflow.com/questions/491052/mininum-and-maximum-value-of-z-index#answer-491105http://www.quora.com/Cascading-Style-Sheets/Is-there-a-maximum-value-for-z-index

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