ex-HTML

What generally happens when you click on a 'Valid XHTML' link that a developer has put at the bottom of a web page—to proudly proclaim their adherence to web standards—is that the validator tells you the page isn't valid at all and has approximately 197 errors. Here's a test of the first 100 results of a Google search for sites that link to http://validator.w3.org/check/referer (and bear in mind that these are sites with a reasonable PageRank, so have perhaps spent more time on their coding than those lower down in the results):

http://plone.org/products/plonemultimedia/releases/1.0-alpha1XHTML 1.0 Transitional
Failed validation, 1 error
http://xmlns.com/foaf/0.1/XHTML 1.0 Strict
Failed validation, 397 errors
http://valet.webthing.com/page/format.htmlHTML 4.01 Strict
Valid
http://www.usu.edu/alumnifriends/XHTML 1.0 Transitional
Valid
http://happycog.com/pubs/XHTML 1.0 Strict
Valid
http://www.hwg.org/services/classes/phptraining.htmlXHTML 1.0 Transitional
Failed validation, 1 error
http://www.royalsoc.ac.uk/landing.asp?id=7XHTML 1.0 Transitional
Valid
https://www.fsf.org/about/contact.htmlXHTML 1.0 Transitional
Failed validation, 7 errors
http://www-sop.inria.fr/act_recherche/formation/stages_theses_fr.shtmlHTML 4.01 Transitional
Valid
http://www.ercim.org/publication/Ercim_News/enw63/lalmas.htmlHTML 4.01 Transitional
Failed validation, 2 errors
http://google.blognewschannel.com/XHTML 1.0 Transitional
Failed validation, 243 errors
http://nave.escomposlinux.org/glosario/HTML 4.01 Transitional
Valid
http://www.starling-fitness.com/XHTML 1.0 Transitional
Valid
http://www.gnupg.org/misc/links.html.enXHTML 1.0 Strict
Valid
http://www.unr.edu/content/outreach.aspXHTML 1.0 Transitional
Valid
http://plone.org/news/newslisting/folder_summary_view?b_start:int=480XHTML 1.0 Transitional
Failed validation, 1 error
http://www.cs.utexas.edu/~AustinVilla/XHTML 1.0 Strict
Failed validation, 4 errors
http://www.addfaq.com/?cat=2XHTML 1.0 Transitional
Failed validation, 265 errors
http://web.mit.edu/sailing/www/SailingTeam/XHTML 1.0 Strict
Failed validation, 12 errors
http://www.newsoftwaretitles.com/?p=76XHTML 1.0 Transitional
Failed validation, 201 errors
http://microformats.org/blog/2006/01/10/publishing-events-with-wordpress-20/XHTML 1.0 Strict
Valid
http://plone.org/products/lbluegray-plone-skin/releases/1.3XHTML 1.0 Transitional
Failed validation, 1 error
http://plone.org/events/sprints/padovaXHTML 1.0 Transitional
Failed validation, 5 errors
http://datacentral.sdsc.edu/user_guide.htmlXHTML 1.0 Transitional
Failed validation, 2 errors
http://www.uiaccess.com/scaletext.html(no Doctype found)
Failed validation, 1 error
http://www.psigate.ac.uk/newsite/(no Doctype found)
Failed validation, 2 errors
http://www.imag.fr/XHTML 1.0 Strict
Failed validation, 2 errors
http://ieas.berkeley.edu/gas/undergrad_program.htmlXHTML 1.1
Valid
http://www.ercim.org/publication/Ercim_News/enw51/berners-lee.htmlHTML 4.01 Transitional
Failed validation, 2 errors
http://coppermine-gallery.net/forum/XHTML 1.0 Transitional
Valid
http://www.mezzoblue.com/articles/XHTML 1.0 Strict
Valid
http://www.ictp.it/pages/mission/support.htmlXHTML 1.0 Transitional
Valid
http://impressive.net/people/gerald/2001/HTML 4.0 Transitional
Valid
http://www.ndsu.nodak.edu/graduate/XHTML 1.0 Transitional
Valid
http://www.w3c.es/Consorcio/contactoXHTML 1.0 Transitional
Valid
http://www.entemp.ie/HTML 4.01 Transitional
Valid
http://www.cgeu.org/XHTML 1.0 Strict
Failed validation, 1 error
http://etext.library.adelaide.edu.au/HTML 4.01 Strict
Failed validation, 7 errors
http://lugww.counter.li.org/HTML 4.01 Transitional
Valid
http://trizpug.org/gallery/pbc2005/pbc_group_3.jpg/viewXHTML 1.0 Transitional
Failed validation, 3 errors
http://ieas.berkeley.edu/cks/courses.htmlXHTML 1.1
Valid
http://www.afb.org/blog/HTML 4.01 Transitional
Valid
http://vlib.org/Recreation.zhXHTML 1.0 Transitional
Valid
http://vlib.org/Religion.frXHTML 1.0 Transitional
Valid
http://www.arch.cam.ac.uk/server/about.htmlXHTML 1.0 Transitional
Valid
http://www.w3schools.com/tags/default.aspXHTML 1.0 Transitional
Valid
http://www.cpsr-peru.org/Blog/iim2/view?searchterm=electronic%20frontier
Valid
http://www.asu.edu/aad/catalogs/XHTML 1.0 Transitional
Valid
http://www.ams.org/mathweb/mi-reference.htmlHTML 4.01 Transitional
Failed validation, 1 error
http://www.ximinc.com/corporate/privacy.phpHTML 4.01 Transitional
Valid
http://www.plonesolutions.com/contactXHTML 1.0 Transitional
Valid
http://www.w3c.es/Politica/PoliticaOficinaXHTML 1.1
Valid
http://www.ams.org/mathweb/mi-journals.htmlHTML 4.01 Transitional
Valid
http://osflash.org/tutorialsXHTML 1.0 Transitional
Valid
http://www.usweb.com/online_marketing_firm/press_kit/company_overview.htmXHTML 1.0 Strict
Valid
http://www.hwg.org/lists/hwg-style/HTML 4.0 Transitional
Valid
http://www.v-2.org/XHTML 1.0 Transitional
Valid
http://plone.org/author/munwarXHTML 1.0 Transitional
Failed validation, 1 error
http://www.culturedcode.com/xyle/features.htmlXHTML 1.0 Strict
Valid
http://www.dopefly.com/XHTML 1.0 Strict
Valid
http://www.webmilhouse.com/(no Doctype found)
Failed validation, 3 errors
http://x.cygwin.com/docs/ug/XHTML 1.0 Transitional
Valid
http://www.odeyssa.com/XHTML 1.0 Strict
Valid
http://www.maut.mcgill.ca/XHTML 1.0 Transitional
Failed validation, 1 error
http://www.tacoma.washington.edu/ias/admissions/XHTML 1.0 Transitional
Failed validation, 1 error
http://www.cknudsen.com/javacaltools.php?topic=DownloadXHTML 1.0 Transitional
Valid
http://led.loria.fr/pratique.htmlHTML 4.01 Transitional
Valid
http://plone.org/events/regional/nola06XHTML 1.0 Transitional
Failed validation, 27 errors
http://www.wmich.edu/XHTML 1.0 Transitional
Failed validation, 8 errors
http://www.chemweb.com/alchemist-currentXHTML 1.0 Transitional
Failed validation, 66 errors
http://www.monkeymind.net/portfolio.htmlXHTML 1.0 Transitional
Valid
http://www.headlineviewer.com/skins.shtmlHTML 4.01 Transitional
Valid
http://www.21coe.keio.ac.jp/HTML 4.01 Transitional
Failed validation, 4 errors
http://plone.org/events/sprints/paderbornXHTML 1.0 Transitional
Failed validation, 1 error
http://plone.org/development/teams/optimization
Valid
http://plugindoc.mozdev.org/sitemap.htmlHTML 4.01 Strict
Valid
http://wiki.splitbrain.org/wiki:pressXHTML 1.0 Transitional
Valid
http://www.daisy.org/projects/default.aspXHTML 1.0 Transitional
Valid
http://www.addfaq.com/?cat=8XHTML 1.0 Transitional
Failed validation, 249 errors
http://wonderweb.semanticweb.org/participants.shtmlXHTML 1.0 Transitional
Valid
http://wonderweb.semanticweb.org/participants.shtmlXHTML 1.0 Transitional
Valid
http://www.fsf.org/licensing/index_html/SimpleBlogFullSearchXHTML 1.0 Transitional
Valid
http://dublincore.org/groups/coverage/XHTML 1.0 Transitional
Valid
http://www.artypapers.com/XHTML 1.0 Transitional
Valid
http://www.michaelcrow.net/XHTML 1.0 Transitional
Failed validation, 12 errors
http://en.magenson.de/2006/03/XHTML 1.0 Transitional
Failed validation, 3 errors
http://plone.org/products/faqulator/releases/1.3XHTML 1.0 Transitional
Failed validation, 1 error
http://www.mainewebreport.com/XHTML 1.0 Transitional
Failed validation, 22 errors
http://osflash.org/aswingXHTML 1.0 Transitional
Valid
http://www.kryogenix.org/days/2003/12/XHTML 1.0 Transitional
Failed validation, 2 errors
http://www.gnome.org/contact/XHTML 1.0 Transitional
Valid
http://www.fsf.org/blogs/rms/entry-20060125.htmlXHTML 1.0 Transitional
Failed validation, 40 errors
http://www.w3c.de/news.htmlXHTML 1.0 Strict
Valid
http://www.w3c.se/nl-news/nl-2003-03-06.htmlHTML 4.0 Transitional
Valid
http://www.hwg.org/services/classes/photoshoptraining.htmlXHTML 1.0 Transitional
Failed validation, 13 errors
http://www.hwg.org/services/classes/asptrainingcourse.htmlXHTML 1.0 Transitional
Failed validation, 1 error
http://plone.org/events/sprints/berne
Valid
http://www.ercim.org/publication/Ercim_News/enw63/guelfi.htmlHTML 4.01 Transitional
Failed validation, 2 errors
http://www.ercim.org/publication/Ercim_News/enw63/ricca.htmlHTML 4.01 Transitional
Failed validation, 2 errors
http://www.ee.surrey.ac.uk/Research/VSSP/VideoAnnotation/tennis/XHTML 1.0 Strict
Failed validation, 10 errors

URL/Doctype/Claim/Result of validation