目录一、顺序语句二、条件语句2.1 什么是条件语句2.2 条件语句的语法格式2.2.1 缩进和代码块2.2.2 if语句 (如果……就……)2.2.3if-else语句2.2.4if-elif-else语句（多选一：多种
After keeping in mind that HTML has both an SGML and XML serialisations, which are just encodings for a parser to \"explode\" into a DOM, I\'m wondering whether there are other serialisations for HTML
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