GWT cannot know how many instances of your component you'll instantiate in
the lifetime of your application, so it doesn't make it easy to give widgets
an ID. It's still possible though (myWidget.getElement().setId("myId"),
which supposes you know what you're doing).
See also
https://github.com/stubbornella/csslint/wiki/Disallow-ids-in-selectors (please
read the linked blog post, and also follow links from there)
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