CSS这种写法 height: 5.00004e+06px; 中，应该怎么理解？哪里有文档可以参考呢？

Question

在ant.design的虚拟列表发现了这样的属性值，很震惊。

css的单位中没有见过e这种的，而且计算的话要用calc，但这里居然直接就+拼接了，刷新了我的认知

求大佬们解释下？

Answer 1

css number

When written literally, a number is either an integer, or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits and optionally an exponent composed of "e" or "E" and an integer. It corresponds to the <number-token> production in the CSS Syntax Module [[CSS-SYNTAX-3]](https://drafts.csswg.org/css-... As with integers, the first character of a number may be immediately preceded by - or + to indicate the number’s sign.

5.00004e+06 就是 5.00004 x 10^6 = 5000040