void Element::removeActiveAnimation(Animation* animation)
{
    ElementRareData* rareData = elementRareData();
    ASSERT(rareData);
    size_t position = rareData->activeAnimations()->find(animation);
    ASSERT(position != notFound);
    rareData->activeAnimations()->remove(position);
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.