W3C: "Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections." · Issue #6 · markdown-it/markdown-it-footnote · GitHub
![تويتر \ Ross Guberman على تويتر: "The second puzzle piece links the second part of the first with doctrine. The third and fourth then weave together lines of equal protection cases over تويتر \ Ross Guberman على تويتر: "The second puzzle piece links the second part of the first with doctrine. The third and fourth then weave together lines of equal protection cases over](https://pbs.twimg.com/media/E6hS15eXoAI-4li.png)
تويتر \ Ross Guberman على تويتر: "The second puzzle piece links the second part of the first with doctrine. The third and fourth then weave together lines of equal protection cases over
validator warnings: Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections. · Issue #1678 · w3c/aria-practices · GitHub
![GitHub - center-key/w3c-html-validator: 🚦 A package for testing HTML files or URLs against the W3C validator (written in TypeScript) GitHub - center-key/w3c-html-validator: 🚦 A package for testing HTML files or URLs against the W3C validator (written in TypeScript)](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 (written in TypeScript)
Warning: Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections.
![Current Research on Multiple Births | Acta geneticae medicae et gemellologiae: twin research | Cambridge Core Current Research on Multiple Births | Acta geneticae medicae et gemellologiae: twin research | Cambridge Core](https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0001566000004815/resource/name/firstPage-S0001566000004815a.jpg)