“运行”按钮修正，删除-ms-xxxx，demo中的css排版
npm install caniuse-db
Merge branch 'master' into transition
用*.chm代替css.chm
修订新增参考的描述

修订新增参考的描述
Merge pull request #31 from gucong3000/transition

修订Transitions中的内容
修改position

修改position
修改兼容性视图

修改兼容性视图
更新修改历史

更新修改历史
修改兼容性视图

修改兼容性视图
Merge branch 'master' into gh-pages

Conflicts:
	properties/transition/transition-delay.htm
	properties/transition/transition-duration.htm
	properties/transition/transition-property.htm
	properties/transition/transition-timing-function.htm
	properties/transition/transition.htm
	properties/user-interface/appearance.htm
	properties/user-interface/pointer-events.htm
	selectors/pseudo-element/placeholder.htm
	test.htm
Merge branch 'master' into gh-pages

Conflicts:
	properties/transition/transition-delay.htm
	properties/transition/transition-duration.htm
	properties/transition/transition-property.htm
	properties/transition/transition-timing-function.htm
	properties/transition/transition.htm