<!DOCTYPE html>
<html lang="en">
    {% include head.html %}
    {% include header.html %}
        {{ content }}
    {% include footer.html %}
</html>

<!DOCTYPE html>
<!--[if lt IE 7]>      <html lang="en" class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
<!--[if IE 7]>         <html lang="en" class="no-js lt-ie9 lt-ie8"> <![endif]-->
<!--[if IE 8]>         <html lang="en" class="no-js lt-ie9"> <![endif]-->
<!--[if gt IE 8]><!--> <html lang="en" class="no-js"> <!--<![endif]-->
    {% include head.html %}
    {% include header.html %}
        {{ content }}
    {% include footer.html %}
</html>

Include Paul Irish' alternate ie css detection.
Include Paul Irish' alternate ie css detection.