Better time representation

[Neraste]

Currently, time can be represented either as h:mm:ss, for durations, or hh:mm for absolute time. This creates an ambiguity for short durations, represented as mm:ss. I think a proper differentiation should be made:

Instead of

<time>h:mm:ss</time> <!-- duration -->
<time>hh:mm</time> <!-- time -->

it could be:

<time>h:mm<span class="seconds">ss</span></time> <!-- duration -->
<time>mm<span class="seconds">ss</span></time> <!-- time -->

with .seconds style having a smaller font.

Possibility to keep the ::

<time>h:mm<span class="seconds">:ss</span></time> <!-- duration -->
<time>mm<span class="seconds">:ss</span></time> <!-- time -->