Theflstandard.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
CSS: Unknown pseudo-element or pseudo-class “:where”
CSS: Parse Error.
CSS: Unknown pseudo-element or pseudo-class “:is”
CSS: Unknown pseudo-element or pseudo-class “:focus-visible”
CSS: “scrollbar-width”: Property “scrollbar-width” doesn't exist.
CSS: “-webkit-mask-image”: “30%” is not a “color” value.
CSS: “mask-image”: “30%” is not a “color” value.
CSS: “inset”: Property “inset” doesn't exist.
CSS: “background”: “0” is not a “color” value.
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
Element “img” is missing required attribute “src”.
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