This formatting takes out all the white space from the beginning and end of the content inside the tag. White space characters are:
- an ordinary space, " " (ASCII 32 (0x20)).
- a tab, "\t" (ASCII 9 (0x09))
- a new line, "\n" (ASCII 10 (0x0A))
- a carriage return, "\r" (ASCII 13 (0x0D))
- the NUL-byte"\0" (ASCII 0 (0x00))
- a vertical tab"\x0B" (ASCII 11 (0x0B))
