{# What every page the student sees is built on. A page inherits six things by extending this: the typefaces and the shared stylesheet, so two apps cannot drift apart in looks; the header with the logo; the token on the body, so its script can find it without being handed it again; the tab-close signal, which would otherwise be a thing each new app had to remember to send; dates written in the student's own language, and the page laid out in its direction (direction.js); and sounds played at the speed the student picks (player.html). `header` adds to the header, beside the logo; `footer` is a bar held at the bottom of the window. #}
{% block header %}{% endblock %}