An acquaintance has an embedded booking widget on her site.
Just going through it and checking the site for GDPR stuff, I noticed that it was not using cookies but was using local storage (checking in Firefox Web Developer in private browsing).
I know next to nothing about this technique but from the little I have read it a) appears to function in a similar way to a cookie and b) be substantially less secure because of xss potential.
Anyone want to illuminate whether the use of local storage might be part of this GDPR can of worms?