Top 10 HTML Warnings in Spain

Void elements, like area, base, br, col, embed, hr, img, input, link, meta, source, track, and wbr are self-closing and don’t need a trailing slash /, which should be avoided as that can interfere with unquoted attribute values.

An attribute could not be parsed from the HTML input, probably due to a typo. Check this guide for a related HTML issue.

Element IDs in an HTML document must be unique. The HTML validator is indicating the first occurrence of an ID that is repeated. Check the details for that issue to see web pages affected, and the elements within them, to fix that ID repetition.

The default type for <script> tags is JavaScript, so you don’t need to include the type for JS resources.

The <section> element can be used to define sections of a document, like chapters, tabbed content, etc. Consider using a heading element (any of <h2> to <h6>) to present each section.

The aria-label attribute is used to define a string that labels the current element. Use it in cases where a text label is not visible on the screen. This attribute does not work consistently with all HTML elements, so the W3C validator is warning about a possible misuse.

The button role is used to make an element appear as a button control to a screen reader and can be applied to otherwise non-interactive elements like <div>. If you’re already using a <button> element, then it’s redundant to apply it the role button, as that’s implicit.

The HTML <style> element contains style information for a document, or part of a document, defined in CSS. This element does not need the type attribute anymore, so it should be omitted.

A <script> element has been found that is using the now obsolete charset attribute. You can safely remove this attribute.

A <li> element is used to define an item of a list, so adding the listitem role to it is redundant.