Use :dir instead of attribute selector

[esprehn]

:host-context([dir="rtl"]) #ink

should be

#ink:dir(rtl) I think?

:host-context and attribute selectors will be expensive.

[bicknellr]

I agree, but I don't think :dir() is supported anywhere except Firefox yet (and prefixed there still). I added a similar hack to paper-tabs.

[DavidHenri008]

@bicknellr the usage of :host-context([dir="rtl"]) is also done in the paper-checkbox and the result is awful on edge...