Rewriting of urls is wrong in the browser when escaping the url value

[stof]

When the url of a font or image is rendered by escaping the string containing it, the rewrite of the url is different when compiling server-side or in the browser.
This is quite annoying as Bootstrap 3.1 and FontAwesome 4.1 use this technique: twbs/bootstrap#10941

[seven-phases-max]

The #10941 technique can't and should not be used, see
#1821 (comment)
#1238 (comment)
I guess the correct solution for those issues would be three different options for --relative-urls (on, off(=relative-to-master) + missing true-off).

As for the particular issue ("different browser-side and server-side handling of urls"), this is a duplicate of #1926.

[seven-phases-max]

Closed as duplicate of #1926.