This is commonly known as an escape sequence.
这通常也称为转义序列。
The escape sequence is not a markup extension and is not backed by a class.
转义序列不是标记扩展，不受类的支持。
HTML is a programming language, too, and it has four different forms of escape sequence.
HTML也是一种编程语言，它有四种形式的转义序列。
HTML is a programming language, too, and it has four different forms of escape sequence.
HTML也是一种编程语言，它有四种形式的转义序列。
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