`reversed` is a [boolean attribute](http://www.whatwg.org/specs/web-apps/current-work/multipage/common-microsyntaxes.html#boolean-attribute). The spec says:

> The presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.
>
> Note: The values "true" and "false" are not allowed on boolean attributes. To represent a false value, the attribute has to be omitted altogether.

("Not allowed" here is an author requirement, not an implementation requirement)

So you want something like `is_reversed = e.get_attr(None, "reversed").is_some()`