SInce a couple of days the Wix Velo blog is down: section Tutorials & Code Examples, click any item, WixData WDE0053/0054 error.
Just to let you know.
Indeed it is. Thanks for letting us know! We’re looking into it now.
Fixed! 
On Chrome it now works. But on Opera still not: Failed to execute ‘postMessage’ on ‘DOMWindow’: The target origin provided (‘https://www.youtube.com’) does not match the recipient window’s origin (‘https://www.wix.com’).
errors.js:333 Uncaught (in promise) Error: WDE0053: Internal wixData error: WDE0054: The server could not fulfill the request.
On Edge same postmessage-error, but no WDE0053/0054 error.
Might be an Opera thing: I have had some trouble with postMessage too on latest releases of Opera.
@giri-zano The team looked into it and they think it’s an issue with Opera, not Velo.
@marlowe-shaeffer Thanks. It might be of interest to look into the matter more closely: I think Opera is tying down messaging to siblings/parent (the former release of Opera Mobile had it completely locked off, it’s fixed now). This has of course great impact on Wix Velo developers who postMessage to the Velo html-component and users who use Opera. Maybe it’s time to say goodbye to the html-component, this was a long time coming (according to Yoav, I remember).