Dartpad.dev W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
Errors:
CSS: Parse Error.
CSS: “-ms-flex”: Unknown dimension.
CSS: “-webkit-flex-basis”: Unknown dimension.
CSS: “flex-basis”: Unknown dimension.
CSS: “transform”: too few values for the property “transform”.
CSS: “animation-timing-function”: “mdc-animation-deceleration-curve-timing-function” is not a “animation-timing-function” value.
CSS: “transform-origin-left”: Property “transform-origin-left” doesn't exist.
CSS: “transform-origin-right”: Property “transform-origin-right” doesn't exist.
Bad value “https://fonts.googleapis.com/css?family=Roboto|Roboto+Mono&display=swap” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Attribute “flex” not allowed on element “iframe” at this point.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “input” is missing required attribute “aria-checked”.
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