I would like to use niceforms (demo) on my website but HTML5 breaks the design (the corners of text areas shift).
Since I would rather not rely on the "Almost Standards" mode that I suppose makes it look correct with XHTML 1.0 Transitional, I hope someone can tell me how I can make it work with HTML5.
Aside from the demo and the CSS file, I don't think there's anything relevant to this that I could share. One literally just has to change the doctype of the demo and everything shifts a couple of pixels vertically, breaking selection box, text area and that upload box.
The CSS wrote in DEMO is CSS2. I recommend you using CSS3 with HTML 5. Text area problems are: