I found that the editor in the website module does not work if you are running Odoo on premises without a connection to the internet.
On a fresh install of Odoo 17 CE, with the Website module installed, when you click Edit
on any website page, the editor does not open up. After some seconds 2 error message boxes are displayed.
If you examine the requests that are being executed in the browser dev tools, you will see that it is attempting to access fonts.googleapis.com
for all of the various fonts that are part of whatever website theme has been set up for the website.
I was not able to get past this error.
I believe I have tracked this down to the following file:
addons/website/static/src/scss/website\.wysiwyg\.scss
It\ appears\ that\ there\ is\ a\ bug\ in\ this\ code\ which\ is\ causing\ it\ to\ always\ default\ to\ attempting\ to\ read\ the\ fonts\ from\ fonts.googleapis.com
when it should default to reading the fonts from the local website theme on disk.
I solved this for my immediate needs by commenting out the conditional logic. I will post this as a reply as a solution to this problem, in case anyone else runs into it.