Comment to URL Previews
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with regard to the general semantic overlook of the thing, why is this necessary? if you want to know what a link is, you click it. if you dont like what your seeing when you click it, click the back button.
:)
that being said, are you talking about a quicklook functionality like in iOS or similar? if so they should all do that by default on long press and hold of a link..
if its a request for a preview on hover, thats a java script type thing.. :) and i dont know how, but gander it uses some kind of http call and fancybox to generate the preview which would be stored in a temp file. or something similar
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here is iframely at work showcasing a friends short film: https://www.cinematica.org/
:)
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As @TIM said, Embedly works fine.