Online-teacher.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
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.
Bad value “skype: tutor-distance?call” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad element name “fb:like-box”: Code point “U+003A” is not allowed
The “border” attribute on the “table” element is obsolete. Use CSS instead.
The first child “option” element of a “select” element with a “required” attribute, and without a “multiple” attribute, and without a “size” attribute whose value is greater than “1”, must have either an empty “value” attribute, or must have no text content. Consider either adding a placeholder option label, or adding a “size” attribute with a value equal to the number of “option” elements.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
The text content of element “script” was not in the required format: Content contains the character sequence “<!--” without a later occurrence of the character sequence “-->”.
Warnings:
Element name “fb:like-box” cannot be represented as XML 1.0.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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