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I got a warning message when I checked the validator.
Warning Line 27, Column 19: Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections. <section>
But they also said this document was successfully checked as HTML5! so I don't know what is the problem.
Gregory Radek869 Points
Don't worry. This is actually normal. The validator outputs 2 different kinds of results. Warnings and Errors. Errors are what you must act upon to fix, however warnings are more advisory. A section works best on SEO terms if you add a heading element directly within it at the top, but its not always possible depending on how you have coded your site and this can be ignored if you wish.