Jade Syntax, just visit http://jade-lang.com/demo/ and paste the code

_demo.jade

// HTML comment
//- jade comment

- var alpha = "foo"
- var beta = "bar"
- var delta = "<i>baz</i>"
- var gamma = "footer"

h1 foobar
h1 foo#{beta}
h1 #{alpha}bar

//- WARNING: whitepsace(s) between h1 and = are forbidden! The same for h1=!
h1= alpha+beta
h1= alpha+"bar"

h2: i baz
h2!= delta

//- here: unbuffered HTML code
h3= delta

footer imprint
#{gamma} imprint

demo.html

<!-- HTML comment-->
<h1>foobar</h1>
<h1>foobar</h1>
<h1>foobar</h1>
<h1>foobar</h1>
<h1>foobar</h1>
<h2><i>baz</i></h2>
<h2><i>baz</i></h2>
<h3>&lt;i&gt;baz&lt;/i&gt;</h3>
<footer>imprint</footer>
<footer>imprint</footer>