www.wysiwygwebbuilder.com

this may be a stone-age question,
because WYSIWYG Web Builder,
might be already too advanced for this,

but can one somehow filter,
all its features / templates / extensions,
by somehow categorically down,
to what only uses pure HTML+CSS,
and no other scripts at all,
like no JavaScript and no other scripts?

so one could truly build
(or at least see what is available)
in pure HTML and CSS only.

i guess seems hard to filter so,
because so much of it seems
already "interlocked" with
JavaScript or other scripts,

any ideas still?

I'm sorry, there is no filter for HTML / CSS only features.
But in general, dynamic features will require JavaScript.

For example, a photo gallery with static images will use HTML/CSS only.
A slideshow with animated images will use JavaScript.
JavaScript is only used when it's needed.