Please improve data for topic: html, feature: fieldset

[cvrebert]

There should be a row in the feature table for support of the disabled attribute of <fieldset>s (which is spec'd to cause form control descendants to become disabled).

[renoirb]

Can you make a pull request with the data you have? You can add data manually by following a format similar to #1 Making those manually are temporary but still required for a while.

[cvrebert]

Okay, submitted PR #5.