In the docs examples
https://igorescobar.github.io/jQuery-Mask-Plugin/

//*[@id = 'placeholder'] returns multiple results

The only reason I noticed is that I use it for automated tests that were checking compatibility.

thanks for this; its great
One note, in your examples you do >>> from dominate.tags import *

but your tag names ( and I understand you got them from html ) are so short and generic that they will almost invariably collide with temporary names - e.g. img, I use everywhere in local contexts.
I would suggest that you follow the example of numpy or matplotlib that in their documents define a c