h5bp/html5please — pull request #287 by mzgajner (2013-10-28 14:08:26+00:00)
Title: Add info on viewport unit bugs on iOS

There's a serious issue with viewport units on iOS 6 and 7, where they are broken if the page has any content off screen (in other words - if your page requires any scrolling, you won't be able to use these units).

I don't know whether the recommendation status should be changed to *avoid* because of this, but it should at least be mentioned.