Javascript 如何从网站页面中提取css值

是否有任何方法可以使用css类名从网站页面提取css值。我想使用父类css名称获取所有css值和子类值

例如：

网页Css：

.container {
    width: 80%;
  }
  .btn-wrap {
    padding: 3px;
    width: 25%;
    text-align: center;
  }
  .text-box {
    margin: 0 auto;
    width: 50%;
  }
  .frm-btn-grp {
    padding: 3px;
    width: 100%;
    text-align: center;

  .btn-success {
    border: 1px solid green;
    padding: 7px 24px;
    border-radius: 2px;
    color: white;
    background-color: green;
    width: 100px;
  }
  }

如果我将.frm btn grp作为输入，它将返回

.frm-btn-grp {
    padding: 3px;
    width: 100%;
    text-align: center;

  .btn-success {
    border: 1px solid green;
    padding: 7px 24px;
    border-radius: 2px;
    color: white;
    background-color: green;
    width: 100px;
   }
  }

---

这可能吗？

这里有一些网站垃圾操作：

import re
import urllib.request as ureq

sample_url = "https://stackoverflow.com/questions/59685137/how-to-extract-css-values-from-website-page"

with ureq.urlopen(sample_url) as req:
    data = req.read().decode('utf-8')

#- Split HTML by line ending; Look for 'text/css' matches
css_lines = [i.strip() for i in data.split('\n') if len(i) > 0 and 'text/css' in i]

#-- Create a simple regular expression to extract the css html
#-- Note: ?P<named_tag> allows for naming each section, but I think
#-- it only works on compiled regular expresions, which isn't a huge
#-- deal.
css_pat = r'href="(?P<css_url>.+)"'
p = re.compile(css_pat)

#-- Create a list and append it with our matches.
css_urls = []
for i in css_lines:
    tmp = p.search(i).group('css_url')
    if tmp:
        css_urls.append(tmp)

然后，你可以做任何事。迭代URL以获取所有css数据，打开所有css文件并将其合并为一个，等等

with ureq.urlopen(css_urls[0]) as req:
    css_data = req.read().decode('utf-8')

#-- Here's a sample printout of a css file for this page
#-- I added some .replace() statments to make it prettier :-)
print(css_data[:500]
    .replace(',', ',\n')
    .replace('{', ' {\n\t')
    .replace(';', ';\n\t')
    .replace('}','\n\t}\n\n')
    )

截断输出：

html,
body,
div,
span,
{...}
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
        margin:0;
        padding:0;
        border:0;
        font:inherit;
        font-size:100%;
        vertical-align:baseline
        }

article,
a

---

到目前为止你试过什么？比什么都好奇。。。你为什么要这样做？@roganjosh现在我想手动提取所有css值。这需要更多的时间。所以我会寻找一些自动化代码。可能吗？这重申了你想做的事情，但我问了为什么。@Bryan我什么都没开始。我已经搜索了相关的内容，但我仍然不知道如何开始这个想法。这就是我发布这个问题的原因。

html,
body,
div,
span,
{...}
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
        margin:0;
        padding:0;
        border:0;
        font:inherit;
        font-size:100%;
        vertical-align:baseline
        }

article,
a