![GitHub - center-key/w3c-html-validator: 🚦 A package for testing HTML files or URLs against the W3C validator GitHub - center-key/w3c-html-validator: 🚦 A package for testing HTML files or URLs against the W3C validator](https://raw.githubusercontent.com/center-key/w3c-html-validator/main/examples.png)
GitHub - center-key/w3c-html-validator: 🚦 A package for testing HTML files or URLs against the W3C validator
W3C: "Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections." · Issue #6 · markdown-it/markdown-it-footnote · GitHub
Warning: Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections.
validator warnings: Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections. · Issue #1678 · w3c/aria-practices · GitHub
![css - Warning: Article lacks heading. Consider using h2-h6 elements to add identifying headings to all articles - Stack Overflow css - Warning: Article lacks heading. Consider using h2-h6 elements to add identifying headings to all articles - Stack Overflow](https://i.stack.imgur.com/0qFjq.jpg?s=64&g=1)
css - Warning: Article lacks heading. Consider using h2-h6 elements to add identifying headings to all articles - Stack Overflow
![aria role not allowed on aside (dialog) element (per w3c validator) · Issue #2226 · material-components/material-components-web · GitHub aria role not allowed on aside (dialog) element (per w3c validator) · Issue #2226 · material-components/material-components-web · GitHub](https://user-images.githubusercontent.com/12751611/36064814-94459664-0e56-11e8-815a-0287a1f610dc.png)