html - What does `//` in javascript's src attribute do? -

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this question has answer here:

i'm using facebook's javascript sdk , has double forward slashes. mean?

<script src="//connect.facebook.net/en_us/all.js"></script>

i know single / means root directory, //? telling source use http:// , path?

this "protocol-relative" link. uses http or https depending on used load current page.


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