Widget:Parser debug info

Widget to show parser debug comments.

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<script> const showDebugInfo = () => {

   const displayElement = document.getElementById('parser-debug-info');
   const parserOutput = document.querySelector('.mw-parser-output');
   const getComments = ( elem ) => {
       let comments = [];
       for (let iii = 0; iii < elem.childNodes.length; iii++) {
           const node = elem.childNodes[iii];
           if (node.nodeType === elem.COMMENT_NODE) {
               comments.push(node);
           } else {
               comments.push( ...getComments(node) );
           }
       }
       return comments;
   };
   const parserComments = getComments(parserOutput).map(c => c.textContent).join('\n');
   displayElement.textContent = parserComments.trim();

}; document.addEventListener( 'DOMContentLoaded', showDebugInfo ); </script>