The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.
Using experimental feature:
HTML5 Conformance Checker.
The validator checked your document with an experimental feature: HTML5 Conformance Checker. This feature has been made available for your convenience, but be aware that it may be unreliable, or not perfectly up to date with the latest development of some cutting-edge technologies. If you find any issues with this feature, please report them. Thank you.
DOCTYPE Override in effect!
The detected DOCTYPE Declaration
"<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">" has been
suppressed and the DOCTYPE for
"HTML5" inserted instead,
but even if no errors are shown below the document will not be Valid
until you update it to reflect this new DOCTYPE.
<li><a href="/page/CPO/CTGY/Corrugated Paper">Corrugated Paper</a>
/hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.
<li><a href="/page/CPO/CTGY/Sheer Paper">Sheer Papers</a>
/hello, #canvas, or http://example.org/. Characters should be represented in NFC and spaces should be escaped as %20.
Below is the source input I used for this validation:
Below is an outline for this document, automatically generated from the
heading tags (<h1> through <h6>.)
If this does not look like a real outline, it is likely that the heading tags are not being used properly. (Headings should reflect the logical structure of the document; they should not be used simply to add emphasis, or to change the font size.)
If you want to examine the semantic structure of your documents, beyond the outline, try the Semantic data extractor.