Title: W3C Html5 Validator Last modified: August 21, 2016 --- # W3C Html5 Validator * Resolved [dojbouli](https://wordpress.org/support/users/dojbouli/) * (@dojbouli) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/) * Hi ! I have a problem with w3c validation… (HTML5) Anybody knows how to fix it ? * Element link is missing required attribute property. * …l-slider/assets/metaslider/public.css?ver=2.1.1′ type=’text/css’ media=’all’/ > * Element link is missing required attribute property. * …ts/sliders/nivoslider/nivo-slider.css?ver=3.5.1′ type=’text/css’ media=’all’/ > * Element link is missing required attribute property. * …nivoslider/themes/default/default.css?ver=3.5.1′ type=’text/css’ media=’all’/ > * [http://wordpress.org/extend/plugins/ml-slider/](http://wordpress.org/extend/plugins/ml-slider/) Viewing 15 replies - 1 through 15 (of 15 total) * [matchalabs](https://wordpress.org/support/users/matchalabs/) * (@matchalabs) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761561) * Hi, * Could you send me a link to your site please so I can run it through the validator? * Regards, Tom. * Thread Starter [dojbouli](https://wordpress.org/support/users/dojbouli/) * (@dojbouli) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761563) * how can I send u the link by private msg ? * [matchalabs](https://wordpress.org/support/users/matchalabs/) * (@matchalabs) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761565) * tom [@] matchalabs.com 🙂 * [reinhardf](https://wordpress.org/support/users/reinhardf/) * (@reinhardf) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761659) * Same problem: [http://wordpress.org/support/topic/slider-not-appearing-with-js-css?replies=7](http://wordpress.org/support/topic/slider-not-appearing-with-js-css?replies=7) * My Solution: I’ve just unchecked printcss. And in header.php (-area) i’ve added the 3 css-lines: * [reinhardf](https://wordpress.org/support/users/reinhardf/) * (@reinhardf) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761695) * Hi Tom, * for your info: Version 2.1.2 (HTML5 Validation fix for inline styles) shows the same HTML5-Validation-errors. * Example (here Version 2.01): [http://validator.w3.org/check?uri=http://www.matchalabs.com](http://validator.w3.org/check?uri=http://www.matchalabs.com)– last three errors: “Element link is missing required attribute property.” because CSS in footer. * [matchalabs](https://wordpress.org/support/users/matchalabs/) * (@matchalabs) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761697) * Hi reinhardf, * Thanks for the heads up. We’ve enabled minify using w3 total cache which has moved the CSS to the head. * I’ve looked into this quite a lot, and there is no easy way to solve this due to the way WordPress runs: * – Header – Content (this is where the metaslider shortcode is processed, it’s too late to add scripts to the header as this point, so they go in the footer)– Footer * Other sliders have the option to include the CSS (and JS) in the header of every page. This isn’t a great solution as it adds page weight where it’s not needed, but its especially not great for Meta Slider as we’d have to include the CSS for 4 different slider libraries. Maybe I could move all the CSS into a single file, minify it and include it on every page by default – no doubt other people wouldn’t be happy with this solution though! * Other solutions try to scan the page for matching shortcodes before they add scripts to the head. It’s a bit hacky and wouldn’t work for sliders included in the template, so we can’t do that either. * The only option left would be to process every page after it has been generated, and move any scripts up into the head. This is essentially what w3 total cache does. * Regards, Tom. * [matchalabs](https://wordpress.org/support/users/matchalabs/) * (@matchalabs) * [13 years ago](https://wordpress.org/support/topic/w3c-html5-validator/#post-3761698) * PS, the fix mentioned in the changelog is for the