Ballnaja.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “facebook-button”.
Duplicate ID “line-button”.
Duplicate ID “youtube-button”.
Duplicate ID “twitter-button”.
Warnings:
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).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “facebook-button” was here.
The first occurrence of ID “line-button” was here.
The first occurrence of ID “youtube-button” was here.
The first occurrence of ID “twitter-button” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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