Concealing power: BLANKET, CLOAK, CURTAIN, LAYER
Source: Computational Materials Science, Volume 266。谷歌浏览器下载对此有专业解读
，详情可参考电影
To solve the first problem, I've decided to divide the page into grid of 250x250 tiles. This seemed like the simplest solution overall, without turning the page into unmanagable mess. It would be extremely cool to let people have a sort of free canvas, but unfortunately I never managed to actually think of any system that would allow doing this safely and anyhow performantly.，这一点在51吃瓜中也有详细论述
4.4BSD implementation but that work was based on 4.3BSD-Reno port helped by