Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Attribute “xmlns:og” not allowed here.
Bad value “Content-Script-Type” for attribute “http-equiv” on element “meta”.
The only allowed value for the “charset” attribute for the “script” element is “utf-8”. (But the attribute is not needed and should be omitted altogether.)
Bad value “” for attribute “href” on element “link”: Must be non-empty.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Duplicate attribute “rel”.
A “link” element with an “as” attribute must have a “rel” attribute that contains the value “preload”.
No space between attributes.
A slash was not immediately followed by “>”.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Duplicate attribute “0""”.
Bad value “” for attribute “src” on element “iframe”: Must be non-empty.
Attribute “https:” not allowed on element “iframe” at this point.
Attribute “www.googletagmanager.com” not allowed on element “iframe” at this point.
Attribute “ns.html?id” not allowed on element “iframe” at this point.
Bad value “” for attribute “height” on element “iframe”: The empty string is not a valid non-negative integer.
Attribute “0""” not allowed on element “iframe” at this point.
Bad value “” for attribute “width” on element “iframe”: The empty string is not a valid non-negative integer.
Attribute “display:none;visibility:hidden""” not allowed on element “iframe” at this point.
Duplicate ID “faqList”.
Attribute “loading” not allowed on element “img” at this point.
Bad value “https://kidslabo.xsrv.jp/content/lp/img/lp04/top_img.webp 960w, https://kidslabo.xsrv.jp/content/lp/img/lp04/top_img_pc.webp” for attribute “srcset” on element “img”: No width specified for image “https://kidslabo.xsrv.jp/…/img/lp04/top_img_pc.webp”. (Because one or more image candidate strings specify a width (e.g., the string for image “https://kidslabo.xsrv.jp/…/lp/img/lp04/top_img.webp”), all image candidate strings must specify a width.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “img” is missing required attribute “src”.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
Duplicate attribute “class”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Attribute “playinline” not allowed on element “video” at this point.
Element “img” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Stray end tag “div”.
Warnings:
Attribute with the local name “xmlns:og” is not serializable as XML 1.0.
Consider avoiding viewport values that prevent users from resizing documents.
The “charset” attribute on the “script” element is obsolete.
The “type” attribute is unnecessary for JavaScript resources.
Attribute “https:” is not serializable as XML 1.0.
Attribute “ns.html?id” is not serializable as XML 1.0.
Attribute “0""” is not serializable as XML 1.0.
Attribute “display:none;visibility:hidden""” is not serializable as XML 1.0.
The first occurrence of ID “faqList” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.