Custom Elements is not just another library or framework, other than Bootstrap or Spectre this library of css-classes is meant for supporting webdevelopers in making small changes to elements, helping them writing less css.

The library contains classes that only change some characteristcs of an element. It's very helpful when you're writing code and only have to change one or two, or even a small group of elements, so you won't have to dive in youre css-file and search for selectors.

I developted the code in the first place for myself because I noticed I wrote the same css-code in some projects over and over, so making one library of classes whas a whole lot more efficient.