Wedge

Yup. And Wedge supports most html5 custom input types. :)

To explain, you can use <input type="email"> instead of <input type="text">, and non-compliant browsers will just render a standard textbox but ones that are compliant and where it makes sense will do something different; Mobile Safari at least will give you the email-centric keyboard.

There are other advantages for this, too, e.g. type="number" where you can set optional min and max and step for the number, e.g. you can set min=2, max=10 and step=2 and compliant browsers will only allow you to submit the form if the number in the box is between 2 and 10 in steps of 2, e.g. 2, 4, 6, 8, 10. (Non-compliant ones only treat it as a regular textbox but it's a nice way of doing things, but it does use browser UI rather than any custom UI, so you might want to use your own UI if you custom-validate other elements and display warnings client-side before sending the form off)

I never looked to be honest, but it would be neat if they do.

Certainly if they don't now, they will going forward and hopefully in a cross-browser fashion.