According to the docs, twitter:player:width has a maximum of 435px. On my current version of twitter.com, I see them getting resized to 506px. Presumably this is part of the new design… is the new maximum going to be 506, or are there any plan to change the size-handling?
We’ve struggled a bit with how Twitter handles the embed scaling - our current iframe-embed player doesn’t keep a constant aspect ratio for different sizes. We’re looking at redesigning it, but it would be nice to know if we need to focus on designing for a fixed aspect ratio, or for 435px, or 506px.