Thanks, guessed about the HTML compliance of min max etc. after a little while.
About the error, I was actually referring to the line first line of example on
http://www.kendoui.com/documentation/ui-widgets/numerictextbox/configuration.aspx
It talks about using "decimals" instead of "data-decimals" for HTML:
// specify in the HTML
<input id="numeric" value="10" type="number" min="0" max="1" step=".1" decimals="1"/>
<br />