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I don't have any control over the widgets offered by 3rd parties.
I just use the embed tag that they provide, so for things like YouTube, RideWithGPS, etc... whether the widget works in all browsers, handles different viewport widths, etc is all pretty much down to them.
I don't have any ability to re-format the content of an embed and shape that.
It's really a "Do we want embeds at all?" question, and the value of them seems to outshine the few rough edges that some of the embed providers may have.
This renders find on ios7 safari but it seems to bump up and down the page by a couple of pixels every second or so. Makes it hard to navigate the page.
Also, as the unit is quite long, it makes scrolling past it hard as when it fills the page, your interaction is taken as an input on the map (zoom, drag etc)