Lang Attribute Accessibility: Move the Boundary Inward

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<body class="code"><main><header><div class="eyebrow">Prepared example · source and evidence</div><h1>Lang Attribute Accessibility: Move the Boundary Inward</h1><p>An English link title can inherit Spanish even when only the visible greeting needs that language. <mark>Move the language boundary to the greeting span</mark> so the surrounding link keeps its English scope.</p></header>
<nav><button type="button" id="wrong">Anchor-wide Spanish</button><button type="button" id="correct">Correct scope</button><button type="button" id="reset">Reset</button></nav><p id="result" class="result" role="status"></p><pre id="source"></pre><div id="ledger" class="ledger"></div><section lang="en">Meeting starts at noon. Our greeting is <span lang="es">Buenos días</span>.</section><p>Expected source declarations. Screen reader, voices and actual pronunciation: not tested.</p>
<footer>Original supplied example. Local state lasts only while this page remains open.</footer></main><script>
(()=>{'use strict';const q=id=>document.querySelector('#'+id);const set=(id,value)=>{q(id).textContent=String(value);};const on=(id,callback)=>q(id).addEventListener('click',callback);const escapeHtml=value=>String(value).replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));const table=(id,heads,rows)=>{q(id).innerHTML='<table><thead><tr>'+heads.map(h=>'<th scope="col">'+escapeHtml(h)+'</th>').join('')+'</tr></thead><tbody>'+rows.map(row=>'<tr>'+row.map(value=>'<td>'+escapeHtml(value)+'</td>').join('')+'</tr>').join('')+'</tbody></table>';};const field=(id,label,value='')=>'<label for="'+id+'">'+escapeHtml(label)+'</label><input id="'+id+'" value="'+escapeHtml(value)+'">';const btn=(id,label)=>'<button type="button" id="'+id+'">'+escapeHtml(label)+'</button>';const fmt=value=>Number(value).toFixed(6);
(function(){
 function render(correct){set('source',correct?'<html lang="en">\n<a href="#greeting" title="Read the Spanish greeting"><span lang="es">Buenos días</span></a>':'<html lang="en">\n<a href="#greeting" lang="es" title="Read the Spanish greeting">Buenos días</a>');table('ledger',['Text or attribute','Expected language'],[['Document title and heading','en'],['Meeting starts at noon.','en'],['Inline greeting','es'],['Link title',correct?'en':'es — mismatch: English title'],['Visible link greeting','es']]);set('result',correct?'Corrected scope: English title en; visible greeting es. Text is unchanged.':'Anchor-wide es also declares its English title Spanish. Move es to a nested span.');}on('wrong',()=>render(false));on('correct',()=>render(true));on('reset',()=>render(false));render(false);
})();})();
</script></body></html>