Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “header-btn” was here.
The first occurrence of ID “main-menu” was here.
Empty heading.
The first occurrence of ID “” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Errors:
Bad value “//api.w.org/” for attribute “rel” on element “link”: The string “//api.w.org/” is not a registered keyword.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “header-btn”.
Duplicate ID “main-menu”.
Heading cannot be a child of another heading.
Stray end tag “h1”.
The “font” element is obsolete. Use CSS instead.
Stray end tag “a”.
The “center” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “id” on element “a”: An ID must not be the empty string.
Duplicate ID “”.
Attribute “height” not allowed on element “table” at this point.
The “width” attribute on the “table” element is obsolete. Use CSS instead.
The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
The “border” attribute on the “table” element is obsolete. Use CSS instead.
Bad value “” for attribute “for” on element “label”: An ID must not be the empty string.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
End tag “br”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Stray start tag “style”.
Cannot recover after last error. Any further errors will be ignored.
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