html的<style>内样式似乎没有生效，而且好像总是会空2-3行转换后

[JAVAXUAN]

Describe the bug A clear and concise description of what the bug is.

HTML content:

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poi-tl-ext version: [e.g. 0.3.12]

poi-tl version: [e.g. 1.9.1]

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[draco1023]

不支持 style 标签，仅支持行内样式 如果要支持 style 标签，那就跟实现个浏览器的渲染引擎差不多了

[cntigers]

有个需求是根据html标题标签创建文档目录，能推荐个思路么