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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
You may have used a non supported method.
The JS you write in here is interpreted by NodeJS, you can see the NodeJS version next to the language selector.
As it is not interpreted by chrome itself, some methods available in chrome are not implemented.
For example, str.replaceAll is not supported by any NodeJS version (yet?)
You can check such compatibilities on the MDN:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replaceAll
FYI, Y is considered a vowel in many standard alphabets that use it (including the English one, according to Wikipedia https://en.wikipedia.org/wiki/Y). However, the definition of a written vowel is not consistent with the acoustic/phonetic definition(s) of a vowel.
@Madjosz: This definition is not relevant in some languages: in greek, for instance, no vowel name matches its phoneme