<pre> <---------------------------------------
lorem ipsum
lorem ipsum
lorem ipsum
lorem ipsum
lorem ipsum
</pre> <--------------------------------------

OR

<div style="white-space:pre">  <-----------------------------------
lorem ipsum
lorem ipsum
lorem ipsum
lorem ipsum
lorem ipsum
</div>                         <-----------------------------------

来源:https://stackoverflow.com/a/36191199/2377343

要使元素在后面有换行符，为它赋值:

显示:块;

块级元素之后的非浮动元素将在下一行出现。许多元素，如<p>和<div>已经是块级元素，所以您可以只使用它们。

But while this is good to know, this really depends more on the context of your content. In your example, you would not want to use CSS to force a line break. The <br /> is appropriate because semantically the p tag is the the most appropriate for the text you are displaying. More markup just to hang CSS off it is unnecessary. Technically it's not exactly a paragraph, but there is no <greeting> tag, so use what you have. Describing your content well with HTMl is way more important - after you have that then figure out how to make it look pretty.

一个现代而简单的解决方案是这样设置宽度:

宽度:min-content;

这个CSS规则主要适用于文本内容，但不仅限于: https://developer.mozilla.org/en-US/docs/Web/CSS/min-content

p { 保证金:20 px; 颜色:# 222; font-family:'世纪哥特式'，sans-serif; 边框:2px虚线灰色; 填充:3 px; ｝ .max { 宽度:max-content; ｝ .min { 宽度:min-content; ｝ <！DOCTYPE html > < html lang =“en”> <头/ > <身体> <p class="max">最大宽度</p> <p class="min">最小可用宽度</p> < /身体> < / html >

我喜欢非常简单的解决方案，这里还有一个:

<p>hello <span>How are you</span></p>

和CSS:

p {
  display: flex;
  flex-direction: column;
}

也许有人会有和我一样的问题:

我在一个带有display: flex的元素中，所以我必须使用flex-direction: column。

使用overflow-wrap: break-word;如:

.yourelement{
  overflow-wrap: break-word;
}