Hi. I always use TOC for creating left and top menu on my sites. It looks good, when it is in tiddlywiki, but when I render my wiki to many static pages, I see in pages HTML code that all labels ">" become a great part of SVG code many times repeated . So I remove all svg buttons from toc macro, and replace them by CSS styles with ::before{} Then I add some css to make toc menu multilevel and get menu, which look nice both in TW5 and single static page.
code to build TOC
<div class='tw-table-of-contents-top' >
<<toc "YourTopTiddler">>
</div>