Validation results for http://golem.ph.utexas.edu/~distler/blog/files/xhtml-mathml-ruby.xhtml

Validator Input

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

Info: The Content-Type was application/xhtml+xml. Using the XML parser (not resolving external entities).
Warning: Documents encoded as windows-1252 are often mislabeled as iso-8859-1, which is the declared encoding of this document.
At line 1, column 41
Warning: skipping entity: [dtd]
At line 2, column 122
l-math11-f.dtd">↩<htm
Info: Using the preset for XHTML5+ARIA, SVG 1.1 plus MathML 2.0 (experimental) based on the root namespace.
Error: XHTML element rb not allowed as child of XHTML element ruby in this context. (Suppressing further errors from this subtree.)
From line 14, column 3; to line 14, column 6
<ruby>↩ <rb>WWW</
Content model for element ruby:

One or more groups of: phrasing content followed either by a single rt element, or an rp element, an rt element, and another rp element.

There were errors.

Total execution time 289 milliseconds.