Errors:
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “placeholder” not allowed on element “input” at this point.
Attribute “placeholder” is only allowed when the input type is “email”, “number”, “password”, “search”, “tel”, “text”, or “url”.
Element “option” without attribute “label” must not be empty.
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.
Attribute “aria-expended” not allowed on element “a” at this point.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
Bad value “false” for attribute “autocomplete” on element “input”: The string “false” is not a valid autofill field name.
Duplicate ID “sel_con”.
The element “button” must not appear as a descendant of the “a” element.
Bad value “70px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Duplicate ID “course-section”.
Bad value “40px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
Attribute “target” not allowed on element “button” at this point.
Stray end tag “div”.
Heading cannot be a child of another heading.
Duplicate ID “social”.
Warnings:
The first occurrence of ID “sel_con” was here.
The first occurrence of ID “course-section” was here.
The first occurrence of ID “social” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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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