为什么在Chrome中，一个包含相同内容的div比几个span更长？

Question

为什么在Chrome中，一个包含相同内容的div比几个span更长？

7

我有两行10000个"."的等宽字体。第一行整行在一个div中，第二行由1000个每个包含10个"."的span组成。以下是JS fiddle链接：https://jsfiddle.net/fojp5e9z/2/

Here it is with 5000 characters, it is slightly noticeable at the end. At 10000 you get 2 full periods extra length on the top line.

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在Chrome中，这一行比其他浏览器中的其他行长。即使添加normalize.css也无济于事。

为什么会出现这种情况，是否有办法在Chrome中修复，使得所有行的长度都相同？

- Charlotte

去掉等宽字体，它就能正常工作了。 - Huangism

@Huangism 这些点只是占位符。它需要使用等宽字体，以便异构字符对齐。 - Charlotte

1

你的DNA序列现在看起来不错吧？ :) - Temani Afif

1个回答

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Temani Afif · Accepted Answer

我认为这是由于一些四舍五入和复杂计算所致。首先，使用渐变效果更好地说明问题，以查看两种情况之间的差异：

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;
}

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我们可以清楚地看到，顶部的渐变色没有遵循跨度的颜色。我猜这是因为等宽字符 (1ch) 的宽度相当于 7.14063px（在使用 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，我们将这个值加起来 5000 次，然后进行四舍五入，但在下面的 div 中，我们将为每个 span （5 次）求和，然后进行四舍五入，再次求和并进行四舍五入。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，它就会被修复（更改 font-size 当然会更改 1ch 的值）。

这是一个测试，当设置 font-size:16px 时。 https://jsfiddle.net/1gLejzb3/20/ ²

顺便说一句，当在 Firefox 上进行测试时，1ch 等于 8px，这解释了为什么我们在那里没有问题，因为处理整数很容易，而且只有 Chrome 似乎使用非整数值来处理 ch 单位与字体。所以相同的问题也可能会发生在其他 font-family 上。

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。对于等宽字体，我通常依赖于 Inconsolata。它的 1ch 在所有浏览器中默认都等于 8px（甚至在 Chrome 中也是如此）。 https://jsfiddle.net/1gLejzb3/23/ ² 使用这个 font-family，1ch 单位将等于 font-size 的一半，因此 16px 将给出 8px，17px 将给出 8.5px（对于 Fierfox，它将是 8px），依此类推。如果你在 Chrome 中避免使用奇数值，就不会有问题。 ^{1: 这只是一个简单的猜测，因为我不知道浏览器在每种情况下如何处理计算。}
^{2: 我使用 JSfiddle 是因为我已经达到了答案中字符的限制。}