web-gui-tester

<!-- Adapted for codexhost from ZCode 872ad960de7ec172591f7e1952f7849229f94521. See ../NOTICE.md for provenance and licenses. --> ## codexhost browser runtime Use [control-browser](../control-browser/SKILL.md) to select an actually available browser tool and obey its documentation. This skill provides test methodology and does not install ZCode's browser runtime. Reuse prior user authorization and approved test scope; request missing credentials or a genuinely unapproved external effect only when needed. Treat example tool names below as conditional on the current session. ## Core Principles 1. **Pure GUI black-box testing**: Interact only with elements that are visible and operable on the page, simulating real user behavior. During verification, screenshots and/or read-only DOM inspection are allowed, but injecting JavaScript to modify page state, trigger interactions, or bypass frontend logic is strictly prohibited. 2. **Faithful to the actual page**: All conclusions must be based on the page’s actual behavior. Do not guess or speculate. If a normal GUI operation fails, stop and report it; do not use alternative methods to force progress. 3. **Separate testing from fixing**: Do not modify the code under test during testing. If a bug blocks the current path, record the issue, skip that path, and continue testing other unaffected points. Only begin fixing bugs after testing is explicitly declared complete and the user has explicitly or implicitly requested code changes. 4...