Testing whether Codex stays inside a one-file edit limit

From the community · not tested by us

They had Codex improve a contact form's validation while forbidding changes to the HTML and CSS. It planned, stayed in scope and passed its checks, but did no real browser testing.

Details

Posted by@m1lad_az
DateOct 19, 2026
Category🧪 Web dev & testing
Found viaX

Summary written by ToolPassed from the public post. Claims are the poster’s; we haven’t reproduced this.

Tools used, on ToolPassed

◇ChatGPT (Codex)Agent
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