If you need the functionality to start an ordered list (OL) at a specific point, you'll have to specify your doctype as HTML 5; which is:
<!doctype html>
With that doctype, it is valid to set a start attribute on an ordered list. Such as:
<ol start="6">
<li>Lorem</li>
<li>Ipsum</li>
<li>Dolor</li>
</ol>
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