class Phlex::SGML

def comment(&)

[MDN Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Comments)

Wrap the output in an HTML comment. 
def comment(&)
	context = @_context
	return if context.fragments && !context.in_target_fragment
	buffer = context.buffer
	buffer << "<!-- "
	__yield_content__(&)
	buffer << " -->"
	nil
end