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#phone-sub-esim was missing its closing </div> before #phone-sub-test, so the browser parsed the test panel (and everything after) as a child of the eSIM panel. Clicking Test script unhid the panel itself, but its hidden ancestor kept it invisible - the pill has never shown a panel in a real browser since it was added (v3.5.11). The eSIM LPA pill conversely showed the whole test editor below its own fields. The old whole-file div-count test stayed green because the inline script's template strings happen to contain one extra </div>; the real markup was 409 opens vs 408 closes. - add the missing </div>. - html.test.js: count divs on the markup only (scripts excluded) and add a structural walk (stray end tags, cross-nesting, unclosed elements, HTML optional end tags honoured) over index.html, help.html and help-ru.html, plus a Simulator-panel sibling-depth check. Run this for every HTML edit. - the walk immediately found the same class of bug in both help pages: six unclosed <section> chapters each; closed them. - AGENTS: the HTML structure test is now part of the working conventions. 602 frontend / 482 Python green; version 3.6.1; sw simple-v274.