Hey @jan-molak - I see you've added an enhancement label here - are you considering adding transparent iframe switching into serenity-js as was done in the java version, where the iframe was added as an optional field in Target?
Interaction to `Switch.to(switchable)` works for both `Page` and `PageElement` now. For
`PageElement`, if the element represents a `frame` or `iframe`, `Switch.to(element)` switches the
top-level browsing context to that frame. When a `PageElement` represents any other HTML element,
invoking `Switch.to(element)` sets browser focus on that element.