| "alt=="Foobar"" | " " | <body> | <p> | <img> | alt="="Foobar"" | src="404" #errors 13: “=” at the start of an unquoted attribute value. Probable cause: Stray duplicate equals sign. 14: “"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value. 21: “"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.

HTML parser #document | | | | | "alt=="Foobar"" | " " | <body> | <p> | <img> | alt="="Foobar"" | src="404" #errors 13: “=” at the start of an unquoted attribute value. Probable cause: Stray duplicate equals sign. 14: “"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value. 21: “"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.