I see formatting problems in the html file for part 1 in the 20.26
chart:interpolation section. Some of the text seems to be pushed to the
left off the page. There is code such as:
<div style="position: relative; left: -3.4031cm;">is the point on this
B-spline corresponding to the parameter <span class="T3">u</span>. If
</div>
Clearly left: -3.4031cm; is not a good sign.

This looks fine in the pdf file.