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.
Element “hr” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “1” for attribute “aria-hidden” on element “a”.
Bad value “” for attribute “aria-pressed” on element “a”.
Element “a” is missing required attribute “role”.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Stray end tag “span”.
Duplicate ID “Symbols”.
Duplicate ID “arrow-long”.
Duplicate ID “Stroke-1”.
Duplicate ID “Stroke-3”.
No space between attributes.
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “div” at this point.
Element “p” not allowed as child of element “strong” in this context. (Suppressing further errors from this subtree.)
Warnings:
The “link” role is unnecessary for element “a”.
The “button” role is unnecessary for element “button”.
The “banner” role is unnecessary for element “header”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “Symbols” was here.
The first occurrence of ID “arrow-long” was here.
The first occurrence of ID “Stroke-1” was here.
The first occurrence of ID “Stroke-3” was here.
Attribute “"” is not serializable as XML 1.0.
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