It's not intentional. It appears to be the result of a bug in the spec; the frame element is missing from [this table](http://www.whatwg.org/specs/web-apps/current-work/#elements-1), which is what we use to build the mapping of tag name -> interface name.
You should submit a review comment (form in the lower right) asking why it's missing. They may have a good reason. It looks like I've special cased `HTMLFrameSetElement` [here](https://github.com/watir/watir-webdriver/blob/e86649c564c2c975c37185cd7b9c89afc2bb3f63/lib/watir-webdriver/html/spec_extractor.rb#L82), which is also missing from the table. --- Reply to this email directly or view it on GitHub: https://github.com/watir/watir-webdriver/issues/204#issuecomment-17846967
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