x/website: in certain browsers/scenarios, pressing [return] in playground editor does not move cursor to next line

[nishanths]

What is the URL of the page with the issue?

https://go.dev/play

What is your user agent?

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.1 Safari/605.1.15

Screenshot

Scenario 1

Scenario 2

What did you do?

• Visited URL mentioned above.
• Move cursor to line 10, either using mouse or keyboard.
• Enter the text type A struct { (scenario 2 only).
• Press return on keyboard.

What did you expect to see?

Expected cursor to move to line 11.

What did you see instead?

No change in cursor position.

Extra notes

These are illustrative of the scenarios I can reliably reproduce the bug. There may or may not be more scenarios. Note that I was using Safari 15.1 on macOS 12. The issue didn't exist in Chrome. I didn't try other browsers.

[seankhliao]

Interesting, I can reproduce this on safari

[seankhliao]

cc @rsc

[rsc]

Seems to only happen on the very last line of the textarea, and only in Safari. Will dig into it.

[gopherbot]

Change https://golang.org/cl/367975 mentions this issue: _content/js: fix typing blank line at bottom of playground in Safari