在我的例子中，我需要一个输入按钮前面有一个换行符。 我应用如下样式的按钮，它工作:

clear:both;

在我的例子中，我需要一个输入按钮前面有一个换行符。 我应用如下样式的按钮，它工作:

clear:both;

您需要声明<span class="class_name"></span>内的内容。过了它，线就断了。

\A表示换行字符。

.class_name::after {
  content: "\A";
  white-space: pre;
}

使用,而不是空格将防止中断。

<span>I&nbsp;DONT&nbsp;WANT&nbsp;TO&nbsp;BREAK&nbsp;THIS&nbsp;LINE&nbsp;UP, but this text can be on any line.</span>

例如，您可以添加大量的填充和强制文本拆分到新行

p {
  padding-right: 50%;
}

对我来说，在响应式设计的情况下工作得很好，只有在一定的宽度范围内，文本才需要被分割。

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.