What is google_experiment_mod in localstorage and is it ok to delete it? [duplicate]

I am coding an html project in my c:/ drive, so the localstorage is shared across the drive as it is considered the same domain. Other than the variables I saved, I see quite a lot of stuff such as

google_experiment_mod36:"341"
google_experiment_mod23:"116"

in my localstorage.

I wanted to clear my localstorage because I saved a few thousand items in it when testing with saving arrays, so I want to know if clearing everything in the localstorage including these google_experiment_mod will affect anything