Can't use start in type="A"/"I"/"i"

Question

I tried to use start in type="A"/"I"/"i",but it didn't work.But it worked fine with type="1".
Example:
<ol type="A" start="C">
<li>Red</li>
<li>Blue</li>
<li>Green</li>
</ol>
<ol type="i" start="iv">
<li>Red</li>
<li>Blue</li>
<li>Green</li>
</ol>
<ol type="I" start="IV">
<li>Red</li>
<li>Blue</li>
<li>Green</li>
</ol>

Answer 1

You must set the start attribut with a numeric value, even the type ins't one...

WARNING:
However, support depends highly on your doctype declaration, because HTML4 specifications retrieve "start" and "type", while HTML5 reintroduce them...
More explanations can be found there: http://html5doctor.com/ol-element-attributes/