Not all features that are standardized are implemented properly on all browsers. This is what uses developer time. It's not terribly different from the situat

Not all features that are standardized are implemented properly on all browsers. This is what uses developer time. It's not terribly different from the situation that exists in the C++ compiler world. Different compiler vendors implement different featuresets. It took many years after the release of the 1997 standard for any compiler to implement it 100%. Is there a compiler out there that implements the current standard completely?