Validation results for http://www-math.mit.edu/18.013A/MathML/chapter07/section01.xhtml

Validator Input

Document
Encoding
Schemas
Preset
Parser
XMLNS Filter
	Be lax about HTTP Content-Type
	Show Image Report
	Show Source

Schema Error: The Content-Type was text/html, but the chosen preset schema is not appropriate for HTML.

The result cannot be determined due to a non-document-error.

Total execution time 1345 milliseconds.