这个CSS值是什么意思？ [英] What does this CSS value mean?

问题描述

在查看网页的来源时，我遇到了这个CSS，应用于按钮内的一个span：

While viewing the source of a web page, I came across this CSS, applied to a span within a button:

.whatever button span {
    position: absolute;
    left: -1e+7px;
}

/ code>是什么意思？这是我应该注意的一些技巧吗？

What does left: -1e+7px; mean? Is this some trick I should be aware of?

推荐答案

它似乎是科学记数法（在本例中为-10,000,000像素）。据我所知，CSS不允许科学记数法（它不在标准，但Google搜索css scientific notation针对Batik - 一个SVG引擎 - 针对不支持它）提出了几个投诉。我想，一些CSS解析器确实支持这样的符号，尽管它不是标准的一部分，但如果是，我不能在找到信息解析器支持它。

It appears to be scientific notation (in this case, for -10,000,000px). To the best of my knowledge, CSS does not allow scientific notation (it is absent from the standard, but a Google search for "css scientific notation" turns up several complaints against Batik — an SVG engine — for not supporting it). I would guess that some CSS parsers do support such notation, despite it not being part of the standard, but if so, I cannot find information on which parsers support it.

为了安全起见，我会避免在你自己的样式表中使用它。

To be safe, I would avoid using it in your own stylesheets.

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