Seems to break Processing Instructions

The code `<%= @rails %>` is mangled into `<%= @rails="" %=""></%>`

This does not fit the XML interpretation of PIs (and is why you had to special-case doctypes, which are also PIs)

Start by reproducing the issue with the `<%= @rails %>` input and trace how processing instructions are handled in the inline-css code. Done means this template is preserved as a valid processing instruction rather than being mangled into `<%= @rails="" %="" ></%>`.

Scritto dal modello di indicizzazione a partire dal testo della issue.