Good question! To be frankly, not much use for a normal development flow (maybe you can use it as a check to see how much compliant is your code with the 'standard'), but it's going to be used by Huula's editor to better identify different elements on a web page, the reason why this is useful there is because Huula editor has all the symantic and visual properties of every element and it can use this information to generate the same class names for similar elements.