Title: HTML 5 Validation errors
Last modified: August 20, 2016

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# HTML 5 Validation errors

 *  Resolved [cody44](https://wordpress.org/support/users/cody44/)
 * (@cody44)
 * [14 years, 7 months ago](https://wordpress.org/support/topic/html-5-validation-errors/)
 * Hi Guys,
 * Im doing a test run with Twenty Eleven theme and all going well so far. Put it
   up for w3c validation and 48 errors, first being **Bad value EditURI for attribute
   rel on element link: Keyword edituri is not registered**
    second is **Bad value
   Cart66Version for attribute name on element meta: Keyword cart66version is not
   registered** Now I cant run thru all the errors but have done some digging and
   found that the theme is based on html 5!! the problem seems to be with the coding
   within the theme shell. Because im looking at optimising the SEO I feel im gonna
   have problems here. I have read that you can change some of the core coding but
   if I do an upgrade then it will just over write the code. Has anyone else had
   similar issues? and is there a work around for this.
 * Any feedback greatly appreciated.
 * Mark

Viewing 1 replies (of 1 total)

 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [14 years, 7 months ago](https://wordpress.org/support/topic/html-5-validation-errors/#post-2365400)
 * HTML 5 is still a draft specification – which means that it is subject to change.
   Also, the HTML validator is experimental – so may flag up false positives.

Viewing 1 replies (of 1 total)

The topic ‘HTML 5 Validation errors’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [esmi](https://wordpress.org/support/users/esmi/)
 * Last activity: [14 years, 7 months ago](https://wordpress.org/support/topic/html-5-validation-errors/#post-2365400)
 * Status: resolved

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