两年后，如果没有使用依赖DOM API的实现(如Tidy等)，仍然没有库可以实现HTML输出缩进.

Two years later and there is still no library to achieve HTML output indentation without using implementations that rely on DOM API (ie. Tidy and alike).

我已经开发了使用正则表达式标记HTML输入的库.除了添加缩进所需的间距外，没有任何HTML更改.

I've developed library that tokenises HTML input using regular expression. None of the HTML is changed beyond adding the required spacing for indentation.

https://github.com/gajus/dindent