Default browsing top to bottom is not neutral.
Default browsing method is from past, text roll what was used in churches and squeres for the news and informing new things, laws etc.
For arabic text bacward and reguar browsing method, horisontal, it can be used mouse too but easyly by arrow keys. Now horisontal and vertical are mixup, it causes disfunktion in brain, when you read a book you say forward but in computer you say down, it doesent make sense because in european culture down is back and up is forward, how we understand things. Past is left and future right, at computer same book is backward: future down like we would be falling, and past up, when in reality past is down underground and we buld top of that to the grond, rare that future would be understood going down throug the ground. Thsi is big problem, philosophical and you have key postion to fix it. Book and computer has to be united now it is chagin our thinking contrary to reality.
Due to lack of clarity we are closing this.