sentences:  The W3C standard was snapshot-based and static, while the WHATWG is a continually updated "living standard".The relationship had been described as "fragile", even a "rift", and characterized by "squabbling".In at least one case, namely the permissible content of the element, the two specifications directly contradicted each other ( with the W3C definition being permissive and reflecting traditional use of the element since its introduction, but WHATWG limiting it to a single defined type of content (the title of the work cited).