Remove form assistant from keyboard in iPhone standalone web app

Question

Is it possible to remove the form assistant from the iPhone popup keyboard in a standalone web app? I know the general consensus is that it's not possible in Mobile Safari, but a standalone app runs in a UIWebView, and functions differently in several ways (example), so I'm hoping this might be possible.

You can see it here right above the keyboard:

The Previous and Next buttons cycle between <form> inputs. But I have a single <input> element, so they are disabled. The Done button hides the keyboard, but since I have a height-flexible <ul> (that takes up the space between the keyboard and the <input>), and I have nothing else on this page, it serves no purpose.

On a tiny screen, and with almost half the screen taken up by the keyboard, the 44 pixels that make up this toolbar are a huge waste of space (an entire <li>'s worth).

Native iOS apps can remove it, so I know it's at least possible on the phone, I've just not discovered a way to do it in a web app. This is from the Facebook app and the page is very similar to mine:

I've tried using an <input> not wrapped in a <form> and also using a contenteditable <div>, but the results were the same. There are several custom -webkit- styles to control various aspects of the web app interface, but they are poorly documented, and a search turned up nothing on this.

Any way to remove the form assistant in a web app?

Answer 1

All signs point to this not being possible, including several questions here.