How to run a local instance of om-welcome for debugging
For those who are (or not) familiar with git, here is lesson #2 
See https://github.com/OpenMandrivaSoftware/om-welcome
Clone git repository into a folder of your choice. Mine is named GIT:
– Look at the green button “<> Code” and you find the address you need. Pick the HTTPS one, click the clipboard icon
– Then open console in your folder and type
git clone followed by the address you just got (paste it in console)
git clone https://github.com/OpenMandrivaSoftware/om-welcome.git
This way you have obtained a local copy of the committed code, which may or may not yet be included in the rpms published
– cd trough the newly created directories GIT/om-welcome/usr/share/om-welcome
– Now here is the command, as provided in the README file
htmlscript -s 1020x700 -i /usr/share/icons/openmandriva.svg index.sh.htm 2> /dev/null;
It will open the local instance of om-welcome for debug.
You can make changes and see how they would look and work.
Be aware that any input in the local instance will impact your system.
As an example if you click the upgrade system module you are going to actually upgrade your system and if you click the install foo, then foo will be installed. For your information 
How to install git?
As usual:
sudo dnf install git --refresh