1, when a child element of its parent element will also hold up to hold up to the first solution becomes margin-top
The parent element padding-top
The second solution is: the parent element plus border
2, overflow: the relationship between the various properties
The default value of the content will not be visible changes will be presented outside the box elements
hidden content will be built, and the rest is not visible
scroll content will be trimmed but the browser will display scroll bars for the rest of the contents of a single check
If the content is auto trim the browser displays scroll bars so that answered the rest of the content
inherit provisions should be integrated overflow property value from the parent element
3, white-space is used to modify the properties of the space element
normal default blank will be ignored by the browser
pre blanks are reserved browser that behaves similar pre tag in HTML
nowrap text does not wrap text will continue to encounter br tag up on the same line
pre-wrap blank character sequence but normal line feed
The combined pre-line blank newline character sequence but the table
should inherit a predetermined integrated value of the white-space attributes from the parent element
4, the text used to be described is text-decoration
The status of their representatives
text-decoration: none default definition standard text
Under the definition of a line of text underline
Definition of a text line on the overline
line-through line is defined through the text
blink-defined blinking text
should inherit a predetermined integrated text-decoration property value from the parent element