为什么div比相同内容的多个跨度长(仅在Chrome中) [英] Why is a div longer than several spans with the same content (only in Chrome)
本文介绍了为什么div比相同内容的多个跨度长(仅在Chrome中)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有两行10000.以等宽字体.第一个在div中包含整行，第二个由10个."的1000个跨度组成.这是JS小提琴链接: https://jsfiddle.net/fojp5e9z/2/
此处为5000个字符，在结尾处略显明显.在10000时，您在顶行得到2个完整的句点额外长度.
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在Chrome中，第一行比另一行长，但在其他所有浏览器中，这些行的长度相同.甚至添加normalize.css也无济于事.
为什么会发生这种情况，并且有一种方法可以将其固定在chrome中，使行的长度相同?
解决方案
我认为这是由于一些舍入和复杂的计算所致.首先，这是使用梯度更好地说明问题的方法，以了解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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我们可以清楚地看到顶部渐变不遵循跨度的着色.我猜这是因为等宽字符(1ch)的宽度等于7.14063px(在使用Chrome测试时)使两种情况下的计算都有所不同.
在上div中，我们将这个值相加5000次，然后在下div中进行四舍五入，但在每个div中将对这个值求和(5次)，然后四舍五入，然后我们将再次求和再四舍五入. 1
当然，我没有任何正式的证明，但是如果我们将font-size更改为另一个值，它将得到固定(更改font-size当然会更改1ch的值).
这是制作font-size:16px时的一项测试.
https://jsfiddle.net/1gLejzb3/20/ 2
作为旁注，在Firefox上进行测试时，1ch等于8px，这说明了为什么我们在那里没有问题，因为它很容易处理整数，并且只有chrome可以处理非整数值带有字体的ch单元.因此，其他font-family也可能发生相同的问题.
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，我通常依靠 Inconsolata .在所有浏览器(甚至在Chrome浏览器中)默认情况下，它的1ch等于8px.
https://jsfiddle.net/1gLejzb3/23/ 2
使用此font-family，1ch单位将等于font-size的一半，因此16px将给出8px，17px将得到8.5px(对于Fierfox，它将是8px)等等.如果您避免使用chrome中的奇数，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 :我使用JSfiddle是因为我已经达到答案中的字符数限制.
I have two lines of 10000 "." in a monospace font. The first has the whole line in a div, the second is made up of 1000 spans of 10 "."'s each. Here is the JS fiddle link: 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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<span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>.....</span><span>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</div></body></html>
In Chrome, this first line is longer than the other, but in every other browser, the lines are the same length. Even adding normalize.css doesn't help.
Why is this happening and is there a way to fix it in chrome so the lines are the same length?
解决方案
I think this is due to some rounding and complex calculation. First, here is a better illustration of the problem using gradient to see the difference between both cases:
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;' >
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We can clearly see that the top gradient is not following the coloration of the spans. I guess it's because the width of a monospace character (1ch) which is equal to 7.14063px (when testing with Chrome) make the calculation somehow different in both cases.
In the upper div we will sum this value 5000 times then we do the rounding BUT in the lower div will sum this value for each span (5 times) then we round then we will sum again and round again.1
Of course, I don't have any formal proof of this but if we change the font-size to another value it will get fixed (changing the font-size will of course change the value of 1ch).
Here is an test when making the font-size:16px.
https://jsfiddle.net/1gLejzb3/20/ 2
As a side note, when testing on Firefox the 1ch is equal to 8px which explain why we don't have issue there since it's easy to deal with integers AND only chrome seems to work with non-integer values for the ch unit with fonts. So the same problem may also happen with other font-family.
In order to avoid such situations, better rely on a font that behave the same in all the browsers. For a monospace font I usually rely on Inconsolata. Its 1ch is by default equal to 8px in all the browser (even in chrome).
https://jsfiddle.net/1gLejzb3/23/ 2
With this font-family the 1ch unit will be equal to half the font-size so 16px will give 8px, 17px will give 8.5px (for Fierfox it will be 8px) and so on. If you avoid the odd values in chrome you won't have issues.
1: it's a simple guess as I don't know how the browser handle calculation in each case.
2: I am using JSfiddle because I have reached the limit of character within an answer.
这篇关于为什么div比相同内容的多个跨度长(仅在Chrome中)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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