Hi Dominique,
I confirm that it does not work in any of my installed browsers. Here's another example:

When I look in the Console, I get an infinite number of error messages like this one:

Hi Dominique,
I confirm that it does not work in any of my installed browsers. Here's another example:

When I look in the Console, I get an infinite number of error messages like this one:

In the documentation page: Moodle Mobile development using Chrome or Chromium.
How to open the browser:
"Path to chrome\chrome.exe" --allow-file-access-from-files --disable-web-security --allow-running-insecure-content --no-referrers --unlimited-storage --auto-open-devtools-for-tabs --user-data-dir=PATH_TO_DATA_DIR
That's not how you open a browser in Windows.
2.- The doc is missing an important information on how to retrieve user-data-dir=PATH_TO_DATA_DIR
Found the info on this page (for Chromium): https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md
3.- The docs says (about the parameters) "NOTE: Since Moodle 3.0 an onwards this shouldn't be necessary since the Web Service layer supports CORS requests apart from download assets such as your branded css."
So, are those parameters necessary or not necessary (I'm using Moodle 3.10)?
Hi Dani,
In the console I'm getting tons of error messages. Indeed it shows that the css files are not loaded, because of a CORS issue.
I've put all the parameters in the Chrome properties, including the user-data-dir
Extract from error messages:

Hi Dani,
For the GapFill question type they are defined at question\type\gapfill\mobile\styles_app.css
and for my own RegExp question type they are defined at question\type\regexp\mobile\styles_app.css
Note that for RegExp question type the css rules work OK on the Moodle App on an Android tablet but do not at all in https://mobileapp.moodledemo.net/
Thanks for your help,
Joseph