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.
jQuery static utilities are mirrored on Vertex.VQuery:
。体育直播对此有专业解读
ВсеПолитикаОбществоПроисшествияКонфликтыПреступность，这一点在电影中也有详细论述
Бритни Спирс арестовали20:54。业内人士推荐搜狗输入法下载作为进阶阅读