You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
An error message is displayed Error! The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again.
What did you expect?
An more helpful error message is displayed that websockets are not supported, e.g. Error! Pagespeed Insights does not support websockets
What have you tried?
No response
How were you running Lighthouse?
PageSpeed Insights
Lighthouse Version
the version pagespeed insights uses
Chrome Version
No response
Node Version
No response
OS
No response
Relevant log output
First Contentful Paint
Error!
The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again. (NO_FCP)
Largest Contentful Paint
Error!
The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again. (NO_FCP)
Total Blocking Time
Error!
The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again. (NO_FCP)
Cumulative Layout Shift
Error!
The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again. (NO_FCP)
Speed Index
Error!
The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again. (NO_FCP)
### Additional information
The error seems to occur only with pagespeed insights. When running lighthouse using chrome devtools, no error occurs.
The text was updated successfully, but these errors were encountered:
I don't think this error comes from using websockets, like you said it only happens using PageSpeed and not Lighthouse in DevTools.
After debugging this in pagespeed myself I think Lighthouse is accurately reporting that the page does not paint any content. Not sure why this is only happening in pagespeed but I expect the issue is with the site not rendering anything for certain clients.
FAQ
URL
https://websocket-example-0.glitch.me/
What happened?
Error! The page did not paint any content. Please ensure you keep the browser window in the foreground during the load and try again.
What did you expect?
An more helpful error message is displayed that websockets are not supported, e.g.
Error! Pagespeed Insights does not support websockets
What have you tried?
No response
How were you running Lighthouse?
PageSpeed Insights
Lighthouse Version
the version pagespeed insights uses
Chrome Version
No response
Node Version
No response
OS
No response
Relevant log output
The text was updated successfully, but these errors were encountered: