为什么一个 div 比具有相同内容的几个 span 长（仅在 Chrome 中）

Question

我有两行 10000 "."等宽字体。第一个在 div 中包含整行，第二个由 1000 个跨度组成，每个跨度为 10 个“.”。这是 JS fiddle link: https://jsfiddle.net/fojp5e9z/2/

这里是5000个字符，结尾有点明显。在 10000 时，您会在顶行获得 2 个完整周期的额外长度。

<!DOCTYPE html><html><body>
<div style='font-family:monospace'>
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
</div>
<div style='font-family:monospace'>
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</div></body></html>

在 Chrome 中，第一行比另一行长，但在所有其他浏览器中，每一行的长度都相同。即使添加 normalize.css 也无济于事。

为什么会发生这种情况，有没有办法在 chrome 中修复它，使线条长度相同？

Answer 1

我认为这是由于一些四舍五入和复杂的计算造成的。首先，这是使用梯度来更好地说明问题以查看两种情况之间的区别：

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

我们可以清楚地看到顶部渐变没有跟随 span 的着色。我猜这是因为等于 7.14063px 的等宽字符 (1ch) 的宽度（当使用 Chrome 进行测试时）使得两种情况下的计算有所不同。

在上面的 div 中，我们将对这个值求和 5000 次，然后我们进行舍入但是在下面的 div 中，我们将对每个跨度（5 次）求和这个值，然后我们舍入然后我们将再次求和并再次舍入。¹

当然，我没有任何正式的证明，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 当然会更改的值1ch)。

这里是制作font-size:16px.

时的测试

https://jsfiddle.net/1gLejzb3/20/ ²

作为旁注，在 Firefox 上测试时 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 似乎适用于带有字体的 ch 单元的非整数值。所以同样的问题也可能发生在其他 font-family.

为了避免这种情况，最好依靠在所有浏览器中表现相同的字体。对于等宽字体，我通常依赖 Inconsolata。它的1ch在所有浏览器中默认等于8px（甚至在chrome）。

https://jsfiddle.net/1gLejzb3/23/ ²

有了这个 font-family，1ch 单位将等于 font-size 的一半，所以 16px 将得到 8px，17px 将给出 8.5px（对于 Fierfox 它将是 8px）等等。如果你避免 chrome 中的奇数值，你就不会有问题。

^{1：这是一个简单的猜测，因为我不知道浏览器在每种情况下如何处理计算。}
^{2：我正在使用 JSfiddle，因为我已经达到了答案中的字符数限制。}

为什么一个 div 比具有相同内容的几个 span 长（仅在 Chrome 中）

Why is a div longer than several spans with the same content (only in Chrome)

html

css

google-chrome

font-family