S — a white-space character, like TAB or new line.
s——空白字符，如制表符或换行符。
Matches any white space character including space, tab, form - feed, and so on.
匹配任何空白字元，包括空格、制表符、换页符等。
White space cannot follow the open angle bracket character '<' in an element tag.
在元素标记中左尖括号字符“<”之后不能有空白。
Sometimes you might want to introduce a white space character to separate two data values.
有时，可能需要使用空白字符分隔两个数据值。
Sometimes you might want to introduce a white space character to separate two data values.
有时，可能需要使用空白字符分隔两个数据值。
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