那些是什么？所以我可以逃脱他们..
解决方法
In CSS,identifiers (including element
names,classes,and IDs in selectors)
can contain only the characters
[a-zA-Z0-9] and ISO 10646 characters
U+00A1 and higher,plus the hyphen (-)
and the underscore (_); they cannot
start with a digit,or a hyphen
followed by a digit. Identifiers can
also contain escaped characters and
any ISO 10646 character as a numeric
code (see next item).code (see next item).
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