I just tried the "Edit this HTML Tag" on a HTML "input" tag.
And the only types available in the dropdown are "<default>", "password", "file" & "text". All the new HTML5 types, like "range", "number" etc. along with the old "radio" and "checkbox" types are missing.
Also it has no support for the new HTML5 attributes either. ("pattern", "min", "max" etc.)
Tested in WeBuilder 2015 v13.2.0.164