Can you guys help me check two webpages?

[Mister Initial Man]

I recently received an email about two webpages I created, and that this person couldn't get them to work.  Would you please double check those webpages, and see if you have problems?  The seem to be working for me.  Those pages are: 

http://www.mrinitialman.com/OddsEnds/Sizes/sizes.html
http://www.mrinitialman.com/OddsEnds/Sizes/compsizes.xhtml

The email in question:

Hello Mr Initial Man,

I hope this email finds you doing well. Your website is quite well designed!

I've been using your Height Comparison tool (http://www.mrinitialman.com/OddsEnds/Sizes/sizes.html) for a few years now, and it's proven very helpful for various projects. However, as of a few months ago, it and its "Multiple Comparisons" equivalent (http://www.mrinitialman.com/OddsEnds/Sizes/compsizes.xhtml) has stopped working. No matter how new or old a browser I use, the figures stay the same size (for the Height Comparison tool) or just don't appear at all (for the Multiple Comparison tool).

If you're still actively updating the site, could you please take a look at the tools and possibly fix them? There's no other resource like it in the web or as a program.

Thank you for reading,

[[name removed for sender's privacy]]

[Hans the husky]

Works fine for me.

[Varg the wanderer]

Worked fine for me. Using Firefox 78