Viblo.asia W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “name” not allowed on element “link” at this point.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Bad value “true” for attribute “async” on element “script”.
Attribute “area-show” not allowed on element “ul” at this point.
Attribute “submit-url” not allowed on element “div” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “value” not allowed on element “textarea” at this point.
Bad value “tabpanel” for attribute “role” on element “form”.
Duplicate ID “username”.
Duplicate ID “password”.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The “form” role is unnecessary for element “form”.
The first occurrence of ID “username” was here.
The first occurrence of ID “password” was here.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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