Transforms enqueued CSS and JavaScript theme URLs to use protocol-relative paths.

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This plugin transforms any registered, enqueued CSS or JavaScript URLs into their “protocol-relative” equivalent.
Consider the following examples:
Protocol Relative CSS URL
<pre><code><link href="//example.com/wp-content/themes/twentytwelve/style.css" />
</code></pre>
Protocol Relative Javascript URL
<pre><code><script src="//example.com/wp-includes/js/jquery/jquery.js"></script>
</code></pre>
More appropriately called a “network-path reference” or “scheme-relative path”, a protocol-relative URL helps to avoid common scenarios such as:
<ul>
<li>Broken SSL padlock icon in browser’s address bar when showing mixed HTTP/HTTPS content</li>
<li>Error message in Internet Explorer saying, “This Page Contains Both Secure and Non-Secure Items”</li>
<li>Serving HTTP assets when viewing HTTPS pages</li>
</ul>
The idea of using protocol-relative URLs was popularized by <a href="http://paulirish.com/2010/the-protocol-relative-url/" rel="nofollow ugc">Paul Irish</a> and has become common as sites switch between serving HTTP and HTTPS assets.
This plugin will standardize all properly enqueued theme files to use protocol-relative paths, even those added from third-party plugins.
Note: This plugin does not transform any image paths that may be embedded in the WordPress editor or output as featured images or elsewhere in the theme — it presently only works on enqueued CSS/JavaScript files.

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