url relative path ../ not works for cross domain link import

[zhangzhimin]

I make a website a.mydomain.com, and I use polymer element , the header.html get well.
in the header.html I use polymer element, but it not work it get "b.mydomain.com/public/ui/compoents/d3/d3.js" instead of expected "b.mydomain.com/public/components/d3/d3.js", so the relative path "../" not work.
in fact, "./" and the absolute path works well,
only "../" not works in cross domain.