id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
21974	esc_url() doesn't allow protocol-relative URLs with colons	SergeyBiryukov		"This doesn't work:
{{{
wp_enqueue_style( 'twentytwelve-fonts', ""//fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700"", array(), null );
}}}
The colon is the culprit. `wp_kses_bad_protocol()` reduces the URL to:
{{{
400italic,700italic,400,700
}}}
So `esc_url()` returns an empty string: [[BR]]
http://core.trac.wordpress.org/browser/tags/3.4.2/wp-includes/formatting.php#L2572"	defect (bug)	new	normal	3.6	Formatting		normal		has-patch