It's not possible to control continent display via data-showContinents, because custom data attributes must not contain capital letters, see https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/data-*:
the name must not contain capital letters.
In niceCountryInput.js this line should be fixed to use lower-case letters only:
this.showContinents = domElement.dataset.showContinents === 'true';
It's not possible to control continent display via
data-showContinents, because custom data attributes must not contain capital letters, see https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/data-*:In
niceCountryInput.jsthis line should be fixed to use lower-case letters only:this.showContinents = domElement.dataset.showContinents === 'true';