WYSIWYG html editor

Maybe LibreOffice Writer.

WYSIWYG is a misnomer when you're talking about HTML, because HTML isn't supposed to define how pages look, only what kind of information they have. Most websites tightly define what they look like, but the way this is done is with CSS. Without CSS, different browsers might render the same HTML in completely different ways.

onpon4 is correct. However, the following may be what you are looking for:

tinyMCE which is in the repository.

If you want to find out more about it there are many tutorial videos out there and you can go to the main website at:
https://www.tinymce.com/

BlueGriffon is a editor powered by Gecko, the rendering engine of Firefox, it's a modern and robust solution to edit Web pages in conformance to the latest Web Standards. It also support many add-ons via their web site. BlueGriffon is a fork of outdated KompoZer. BlueGriffon is not found via Trisquel repo and it have to install from source package.

http://bluegriffon.org/

Bluefish is a powerful editor targeted towards programmers and web developers, with many options to write websites, scripts and programming code. Bluefish supports many programming and markup languages. Bluefish is also found via Trisquel repo.

http://bluefish.openoffice.nl/

WYSIWYG is the best text editor. Most of the companies are used it especially in customized Content Management System. Even i think Wordpress CMS is also using it. I don't know much about programming. Even i am running a blog but this is on Wordpress CMS by worksole.com guys. I have tried few times to learn at least HTML by using online sources but fail due to the time management. Appreciative efforts of trisquel guys are showing in this project. Anyways, thanks for it.