Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/2268
1. number, string and url can be generalized as `text`. For url, we can use
`ng-html` with angular's `$sse` service to draw `<a>..</a>` element
2. if `text` widget means `textarea` DOM, can we change it to `textarea`
instead of?
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