HTML Preview does not show anything in Safari, but when I try the same preview in Chromium-based browsers or Firefox, it works normally. I also tried Private Browsing mode with no extensions, but the preview was still blank.
Is this a Safari issue, or something specific to ChatGPT’s HTML Preview?
Safari 26.5.2
macOS Tahoe 26.5.2
Hey theodemaxx, welcome back!
That's definitely inconvenient.
The HTML Preview actually runs inside a sandboxed iframe, and Safari tends to be stricter than Chrome or Firefox based browsers when it comes to iframe sandboxing. It's also possible that you're running into a Safari-specific issue on macOS Tahoe 26.5.2, which is relatively new.
Could you share any Safari Web Inspector console errors that appear when you open or run the HTML Preview? In particular, errors mentioning iframe sandboxing, Content Security Policy (CSP), blocked resources, blob URLs, or failed script execution would be especially helpful.
In the meantime, the best workaround is to use Firefox or a Chromium-based browser for HTML Preview.
Avinash
