css reference manual v4-2-4

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Version Information Version Information
CSS Reference Manual v4.2.4 Update Time: 2017-03-10
Add descriptions and examples of sibling selectors, adjacent selectors, etc.;
Removed attributes in the entire only-firefox directory;
Added -webkit-overflow-scrolling property reference;
Fix the problem of chm garbled characters on MAC (thanks to @gucong3000 children's shoes);
Revised some Issues raised by enthusiastic users;
Added calc() compatibility description;
Fixed the problem of horizontal scroll bar appearing in navigation bar;