html – 为什么div的长度超过几个跨度且内容相同(仅限Chrome)

span:nth-child(odd) {
  background:green;
}
span:nth-child(even) {
  background:yellow;
}
.grad {
  background:repeating-linear-gradient(to right,green 0,green 5ch,yellow 5ch,yellow 10ch);
}
body {
  margin:0;
  font-family:monospace;
}

<div style='font-family:monospace;display:inline-block;' class="grad">
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
</div>
<div style='font-family:monospace;display:inline-block;background:red;' >
<span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span>
</div>

我们可以清楚地看到顶部梯度没有遵循跨度的颜色.我想这是因为等宽线字符(1ch)的宽度等于7.14063px(用Chrome测试时)会使计算在两种情况下都有所不同.

在上面的div中,我们将这个值加总5000次然后我们在下面的div中舍入BUT将每个跨度的这个值相加(5次)然后我们舍入然后我们将再次求和并再次舍入.

当然,我没有任何正式的证据,但如果我们将font-size更改为另一个值,它将得到修复(更改font-size当然会改变1ch的值).

这是在制作font-size时的测试：16px.

https://jsfiddle.net/1gLejzb3/20/ 2

作为旁注,当在Firefox上进行测试时,1ch等于8px,这解释了为什么我们没有问题,因为它很容易处理整数而且只有chrome似乎与带字体的ch单元的非整数值一起使用.因此,其他font-family也可能出现同样的问题.

为了避免这种情况,最好依赖于在所有浏览器中表现相同的字体.对于monospace字体,我通常依赖于Inconsolata.它的1ch在所有浏览器中默认等于8px(即使在chrome中).

https://jsfiddle.net/1gLejzb3/23/ 2

使用这个font-family,1ch单位将等于字体大小的一半,因此16px将提供8px,17px将提供8.5px(对于Fierfox,它将为8px),依此类推.如果您避免使用chrome中的奇数值,则不会出现问题.

1：这是一个简单的猜测,因为我不知道浏览器如何在每种情况下处理计算.

2：我正在使用JSfiddle,因为我已经达到答案中的字符限制.