This issue was originally filed by @tatumizer

Proposed new type of string literal - ideally, in backquotes (e.g. foo).
 
These strings are supposed to be used only in instance methods in a class, and be automatically compiled into invocation of method "handleTemplate" (exact name TBD):
void handleTemplate(String str, String templateStr), e.g.
class Foo {
   var sb=new StringBuffer();
   void handleTemplate(String str, String templateStr) {
      sb.write(str);
   }
   void example() {
      <h1>Customers</h1>; // calls handleTemplate
      for (customer in customers)
        <p>${customer.name}</p>; // calls handleTemplate
      // etc...
   }
}

As a second argument, system should pass original string as is (e.g. r'<p>${customer.name}</p>'), for the purposes of preventing injection of something bad. Example:
void handleTemplate(str, templateStr) {
  sb.write(ensureNoHtmlMarkup(str, templateStr));
}

These new literals will greatly simplify generation of all kinds of data: html, css, program code (generators) etc.