Haml helper for IE conditional comments visible to non-IE browsers

helper.rb

def iecc_visible(condition, &block)
  output = capture_haml(&block)
  "<!--[#{condition}]><!-->#{output.chomp}<!--<![endif]-->\n"
end

view.haml

/[if lt IE 9]
  .flash.error
    %h1 Oh dear.
    %p Have you considered upgrading your browser?
!= iecc_visible('if gte IE9') do
  .flash.info
    %h1 Congratulations!
    %p Your browser is decent.

The regular Haml syntax for IE conditional comments /[if foo] gives you this output:

<!--[if foo]>
  . . .
<![endif]-->

Non-IE browsers ignore the comment delimiters and everything between them. IE supports an alternate syntax for conditional comments that will not conceal their content from non-IE browsers:

<!--[if foo]><!-->
  . . .
<!--<![endif]-->

But there's no way (that I could find) of generating a conditional comment of this type using Haml's built-in IE conditional comment syntax. Hence the iecc_visible helper, under which one may indent a Haml block to be shown to any non-IE browser as well as any version of IE that passes the specified condition (provided as a string argument to the helper).

The typical use case for this would be in situations where one wished to have a chunk of code for reasonably standards-compliant browsers (non-IE browsers and recent versions of IE) and a different one for legacy versions of IE (e.g. the jQuery version jiu-jitsu under "Questions and Answers" in this post from the jQuery dev blog). This is shown in the "Haml usage" snippet above. Note that one must use Haml's raw output operator != rather than simply =, to prevent the content from being double-escaped by Haml.

The name iecc_visible is an inelegant contraction of "IE conditional comment, visible to non-IE browsers". Better name suggestions welcome.