non core block: layout-shell@div>button[aria-controls][aria-expanded][aria-haspopup][aria-label][data-blocks-engine-capt

Start with the provided reproduction command and reduced page, then read tools/import-loop/predicates/non_core_block.mjs and the referenced emits.mjs and gates/collateral.mjs. Compare the generated output with core blocks and use the reproduction predicate to check whether the non-core block remains. Done means the content uses core blocks and renders with pixel parity.

Finding

editability/non_core_block on layout-shell@div>button[aria-controls][aria-expanded][aria-haspopup][aria-label][data-blocks-engine-capture-dialog-ancestor-state][data-blocks-engine-capture-dialog-trigger][data-blocks-engine-capture-disclosure-label][data-semantic-classname][data-testid][type], seen in 2 route/width cell(s) of an imported site:

Reduced page (8091 bytes)

Reduced from 363147 bytes in 224 predicate calls.

<!DOCTYPE html><html><head><script>(function(){
function triggers(){return document.querySelectorAll('[data-blocks-engine-capture-dialog-trigger]');}
function panel(trigger){var id=trigger.getAttribute('aria-controls');return id?document.getElementById(id):null;}
function closeFor(trigger){var id=trigger.getAttribute('aria-controls');return id?document.querySelector('[data-blocks-engine-capture-dialog-close="'+id+'"]'):null;}
function concealed(trigger){var style=getComputedStyle(trigger);if(style.display==='none'||style.visibility==='hidden')return true;var rect=trigger.getBoundingClientRect();return rect.width===0||rect.height===0;}
function ancestorBindings(trigger){try{return JSON.parse(trigger.getAttribute('data-blocks-engine-capture-dialog-ancestor-state')||'[]');}catch(error){return [];}}
function classTokens(value){return (value||'').split(/\s+/).filter(Boolean);}
function ancestorAt(trigger,depth){var node=trigger;while(depth--&&node)node=node.parentElement;return node;}
function triggerBindings(trigger){try{return JSON.parse(trigger.getAttribute('data-blocks-engine-capture-dialog-trigger-state')||'[]');}catch(error){return [];}}
function applyTrigger(trigger,open){triggerBindings(trigger).forEach(function(binding){var node=binding.selector?trigger.querySelector(binding.selector):trigger;if(!node)return;var target=classTokens((open?binding.opened:binding.closed).class);classTokens((open?binding.closed:binding.opened).class).forEach(function(token){if(target.indexOf(token)<0)node.classList.remove(token);});target.forEach(function(token){node.classList.add(token);});});}
function applyAncestors(trigger,open){ancestorBindings(trigger).forEach(function(binding){var node=ancestorAt(trigger,binding.depth);if(!node)return;
  Object.keys(binding.closed).forEach(function(name){var value=open?binding.opened[name]:binding.closed[name];
    if(!open){var owner=Array.prototype.find.call(triggers(),function(other){return other!==trigger&&!concealed(other)&&other.getAttribute('aria-expanded')==='true'&&ancestorBindings(other).some(function(row){return ancestorAt(other,row.depth)===node&&Object.prototype.hasOwnProperty.call(row.opened,name);});});if(owner){var row=ancestorBindings(owner).find(function(row){return ancestorAt(owner,row.depth)===node&&Object.prototype.hasOwnProperty.call(row.opened,name);});value=row.opened[name];}}
    if(name==='class'){var target=classTokens(value);classTokens(open?binding.closed[name]:binding.opened[name]).forEach(function(token){if(target.indexOf(token)<0)node.classList.remove(token);});target.forEach(function(token){node.classList.add(token);});if(value===null&&!node.classList.length)node.removeAttribute(name);return;}
    if(value===null)node.removeAttribute(name);else node.setAttribute(name,value);
  });
});}
function apply(trigger){
  var target=panel(trigger);if(!target)return;
  var inactive=concealed(trigger),open=trigger.getAttribute('aria-expanded')==='true'&&!inactive;
  applyAncestors(trigger,open);
  applyTrigger(trigger,open);
  if(!open&&Array.prototype.some.call(triggers(),function(other){return other!==trigger&&panel(other)===target&&!concealed(other)&&other.getAttribute('aria-expanded')==='true';}))return;
  var captured=trigger.getAttribute('data-blocks-engine-capture-dialog-panel-state');
  var opened=captured?JSON.parse(captured):null;
  if(open&&opened&&target.__dlaDialogState!==captured){target.innerHTML=opened.html;target.__dlaDialogState=captured;}
  var existing=target.getAttribute('data-blocks-engine-capture-existing-panel');
  if(existing){
    var states=JSON.parse(existing),resting=states.resting.html!==undefined;
    var state=(inactive||(resting&&!open))?states.resting:(opened||states.opened);
    if(resting&&!open&&target.__dlaDialogState!==null){target.innerHTML=states.resting.html;target.__dlaDialogState=null;}
    ['style','class'].forEach(function(name){if(state[name]===null)target.removeAttribute(name);else target.setAttribute(name,state[name]);});
    target.toggleAttribute('data-blocks-engine-capture-resting-panel',inactive);
    target.hidden=inactive?states.resting.hidden:!open;
    if(inactive&&!target.classList.contains('data-blocks-engine-capture-dropdown')){
      // Observe authored resting CSS, not the generated modal positioning.
      // A concealed control only exposes a panel that is visible in normal flow.
      var style=getComputedStyle(target),rect=target.getBoundingClientRect();
      var inline=style.display!=='none'&&style.visibility!=='hidden'&&style.position!=='fixed'&&style.position!=='absolute'&&rect.width>0&&rect.height>0;
      target.toggleAttribute('data-blocks-engine-capture-resting-panel',inline);
      if(!inline)target.hidden=true;
    }
  }else target.hidden=!open;
  var close=closeFor(trigger);if(close)close.hidden=!open;
}
function set(trigger,open){if(open&&concealed(trigger))open=false;if(open)triggers().forEach(function(other){if(other!==trigger&&panel(other)===panel(trigger)&&other.getAttribute('aria-expanded')==='true')set(other,false);});trigger.setAttribute('aria-expanded',open?'true':'false');var label=trigger.getAttribute('data-blocks-engine-capture-disclosure-label');if(label)trigger.setAttribute('aria-label',open?'Close '+label:label);apply(trigger);}
function toggle(trigger){set(trigger,trigger.getAttribute('aria-expanded')!=='true');}
function onClick(event){var close=event.target.closest&&event.target.closest('[data-blocks-engine-capture-dialog-close]');if(close){event.preventDefault();var id=close.getAttribute('data-blocks-engine-capture-dialog-close');var owner=id&&document.querySelector('[data-blocks-engine-capture-dialog-trigger][aria-controls="'+id+'"]');if(owner){set(owner,false);owner.focus();}return;}var trigger=event.target.closest&&event.target.closest('[data-blocks-engine-capture-dialog-trigger]');if(!trigger||!panel(trigger))return;var nested=event.target.closest('a,button');if(nested&&nested!==trigger)return;event.preventDefault();var was=trigger.getAttribute('aria-expanded')==='true';toggle(trigger);if(was)trigger.focus();}
function onKey(event){if(event.key==='Escape'){var open=Array.prototype.slice.call(triggers()).filter(function(item){var target=panel(item);return !concealed(item)&&item.getAttribute('aria-expanded')==='true'&&target&&!target.hidden;}).pop();if(open){event.preventDefault();set(open,false);open.focus();return;}var details=Array.prototype.slice.call(document.querySelectorAll('details.data-blocks-engine-capture-initial-dialog[open]')).pop();if(!details)return;event.preventDefault();details.open=false;var summary=details.querySelector(':scope > summary');if(summary)summary.focus();return;}if(event.key!=='Enter'&&event.key!==' ')return;var trigger=event.target.closest&&event.target.closest('[data-blocks-engine-capture-dialog-trigger]');if(!trigger||!panel(trigger))return;if(trigger.tagName==='BUTTON'||(trigger.tagName==='A'&&event.key==='Enter'))return;event.preventDefault();toggle(trigger);}
function ready(){document.addEventListener('click',onClick);document.addEventListener('keydown',onKey);window.addEventListener('resize',function(){triggers().forEach(apply);});triggers().forEach(apply);}
if(document.readyState==='loading')document.addEventListener('DOMContentLoaded',ready);else ready();
})();</script></head><body><div class="wix-presets-wrapper w-4190f51c-3836-49f6-8114-96219c165b29 hamburgerOpenButton-presets-wrapper"><button type="button" data-testid="buttonContent" data-semantic-classname="button" aria-label="Menu" aria-haspopup="dialog" data-blocks-engine-capture-dialog-ancestor-state="[{&quot;selector&quot;:&quot;body&quot;,&quot;tag&quot;:&quot;body&quot;,&quot;depth&quot;:18,&quot;closed&quot;:{&quot;class&quot;:&quot;&quot;},&quot;opened&quot;:{&quot;class&quot;:&quot;siteScrollingBlocked&quot;},&quot;classTokensOnly&quot;:true}]" data-blocks-engine-capture-disclosure-label="Menu" data-blocks-engine-capture-dialog-trigger="data-blocks-engine-capture-dialog-0" aria-controls="data-blocks-engine-capture-dialog-0" aria-expanded="false"><div><svg></svg></div></button></div></body></html>

Reproduce

The predicate exits 0 while the defect reproduces (checked against blocks-engine trunk 0ea40635). Run it from a static-site-importer checkout at a3e2be9d, with the reduced page saved as reduced.html:

PREDICATE_TARGET='{"subject":"layout-shell@div>button[aria-controls][aria-expanded][aria-haspopup][aria-label][data-blocks-engine-capture-dialog-ancestor-state][data-blocks-engine-capture-dialog-trigger][data-blocks-engine-capture-disclosure-label][data-semantic-classname][data-testid][type]","route":"/about/","width":1440,"evidence":{"route":"/about/","count":1,"of":144}}' \
  WORDPRESS_PATH=<wordpress with static-site-importer active> WP_CLI='studio wp' \
  PREDICATE_CAPTURE=<the site capture: its interaction-states.json and other evidence feed this block> \
  node tools/import-loop/predicates/non_core_block.mjs <blocks-engine>/php-transformer reduced.html

// Exit 0 while the Blocks Engine output of a page still emits the generated
// block <prefix>/<subject>, a block outside WordPress core. An editor can only
// change its structure through the importer's own block, not with core tools.
// The defect is gone when the same content is built from core blocks and the
// page renders exactly as before; the acceptance gate holds the whole import to
// pixel parity (see emits.mjs, gates/collateral.mjs).
import { exitWhileEmitted } from './emits.mjs';
exitWhileEmitted();

Loop signature: 74aca51f0701

AI disclosure: filed by the static-site import findings loop (Homeboy workflow on the Lab). The finding, reduction, and body are generated by deterministic scripts; Claude (Anthropic) wrote those scripts with Chris Huber.