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Why do both these work when embedding a video iframe in a Rails application?

<iframe src="//player.vimeo.com/video/...>

and 

<iframe src="https://player.vimeo.com/video/...>

Please enlighten me. I've seen it both ways. Which is preferable?

Meltemi
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1 Answers1

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Using // infers the protocol from the URL from which the root page is served. Navigating to a site https://yoursite.com would mean all // links would also be served using HTTPS. This can be helpful if you're running the same page in a local environment that is using HTTP, and don't want to change it when pushing it to a production environment served using HTTPS.

Alexa Y
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