CSS Learning (12)-Text line break

First, the theory:
1.word-wrap:
A.normal line wrapping in half-width spaces or hyphens
B.break-word do not truncate English word wrapping
2.word-break:
A.normal Chinese to the boundary of Chinese characters Line, English from the whole word to break
B.break-all forcibly truncate English words for wrapping
C.keep-all not allow word break
3.while-space:
A.normal Default Value
B.pre text Blank space will be detained by the browser
C.nowrap text will be on the peer until a newline character is encountered
D.pre-line merges a sequence of whitespace characters, preserving newline characters
E.pre-wrap preserves a sequence of whitespace characters and wraps it normally.
F.inherit inherit the While-space property of the parent element

Second, Practice:

1.

<!    DOCTYPE html>

CSS Learning (12)-Text line break