Ya learn something new every day. Although I didn’t think so, and it plays hell with some HTML WYSIWYGs and link checkers, the following is a valid src and also works with href:

&lt;img src="//www.example.com/logo.gif" /&gt;

When on a non-https site, it loads the image from http://www.example.com/logo.gif. On an https secure site, it loads the image from https://www.example.com/logo.gif. Essentially, // means use the scheme part of the URI that is currently in use.

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