def toc(prev=None):
    if prev is None:
        prev = gStartTime
    return (datetime.utcnow() - prev).total_seconds()
Our element's glue shouldn't include redundant stylesheet references.
dataset/ETHPy150Open dssg/ushine-learning/dssg/util.py/toc--crossover with--dataset/ETHPy150Open twisted/nevow/nevow/test/test_athena.py/LiveMixinTestsMixin.test_glueIncludesStylesheetsOnce