Title: w3c validation error
Last modified: August 21, 2016
---
# w3c validation error
* Resolved [nesmrten](https://wordpress.org/support/users/nesmrten/)
* (@nesmrten)
* [12 years, 4 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/)
* I am having validation error:
* Error Line 263, Column 310: Element link is missing required attribute property.
* …ets/sliders/flexslider/flexslider.css?ver=2.6.2′ type=’text/css’ media=’all’/
>
* Attributes for element link:
Global attributes href crossorigin rel media hreflang
type sizes Also, the title attribute has special semantics on this element.
* Error Line 264, Column 173: Element link is missing required attribute property.
* …l-slider/assets/metaslider/public.css?ver=2.6.2′ type=’text/css’ media=’all’/
>
* Attributes for element link:
Global attributes href crossorigin rel media hreflang
type sizes Also, the title attribute has special semantics on this element.
* Any way i can solve this? Thanks and best regards from Slovenia.
My webpage:
[http://www.pc-pro.si](http://www.pc-pro.si)
* [http://wordpress.org/plugins/ml-slider/](http://wordpress.org/plugins/ml-slider/)
Viewing 8 replies - 1 through 8 (of 8 total)
* [matchalabs](https://wordpress.org/support/users/matchalabs/)
* (@matchalabs)
* [12 years, 4 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467545)
* Hi nesmrten,
* The easiest way is to use a minification plugin, which takes all of the CSS on
the page and puts it in the . W3 Total Cache is one I know that can do
this.
* Alternatively, you could copy the CSS from the bottom of your page and manually
put it into the head. Then disable the ‘Print CSS’ option in the advanced slideshow
settings.
* There is no reliable way for us to print the CSS directly to the , it’s
a limitation of WordPress (I wish it wasn’t!)
* Regards,
Tom.
* Thread Starter [nesmrten](https://wordpress.org/support/users/nesmrten/)
* (@nesmrten)
* [12 years, 4 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467547)
* Thanks for your quick replay 🙂 i will use w3 Total Cache 🙂
* Thread Starter [nesmrten](https://wordpress.org/support/users/nesmrten/)
* (@nesmrten)
* [12 years, 4 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467553)
* can you just help me with w3 Total cache what to turn on to make it work? thanks
in advance.
* Best regards 🙂
* Thread Starter [nesmrten](https://wordpress.org/support/users/nesmrten/)
* (@nesmrten)
* [12 years, 4 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467558)
* I made it 🙂 thanks
* [matchalabs](https://wordpress.org/support/users/matchalabs/)
* (@matchalabs)
* [12 years, 1 month ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467685)
* Just posting this for anyone who has found this thread on Google.
* I’ve been working on a plugin to move the Meta Slider link, inline script and
style blocks into the of the page:
* [https://github.com/tomhemsley/ml-slider-html5](https://github.com/tomhemsley/ml-slider-html5)
* To install, click ‘Download ZIP’, then go to Plugins > Add New > Upload and select
the .zip file. So far there isn’t a settings page or anything like that.
* **If you’re using this plugin, please let me know how it goes! I may integrate
the functionality into the Meta Slider plugin if it’s working well**
* Regards,
Tom
* [tfagency](https://wordpress.org/support/users/tfagency/)
* (@tfagency)
* [11 years, 10 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467692)
* Tom:
* I’m getting the same validation errors I had before, plus the following output
after my closing `` tag:
* ```
Warning: Invalid callback MetaSliderHtml5::process, cannot access private method MetaSliderHtml5::process() in /[ MY SITE URL ]/wp-includes/functions.php on line 2935
```
* [tfagency](https://wordpress.org/support/users/tfagency/)
* (@tfagency)
* [11 years, 10 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467693)
* BTW I’m using the PRO version, not sure if this would make a difference or not.
* [esmi](https://wordpress.org/support/users/esmi/)
* (@esmi)
* [11 years, 10 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467694)
* I’m sorry but these forums do not support [commercial products](http://codex.wordpress.org/Forum_Welcome#Commercial_Products).
Only the free plugins downloaded from [http://wordpress.org/plugins/](http://wordpress.org/plugins/).
Please contact the plugin’s vendor directly with any questions about commercial
products.
* I am now closing this 5 month old resolved topic as it references an older version
of WordPress.
Viewing 8 replies - 1 through 8 (of 8 total)
The topic ‘w3c validation error’ is closed to new replies.
* 
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* 8 replies
* 4 participants
* Last reply from: [esmi](https://wordpress.org/support/users/esmi/)
* Last activity: [11 years, 10 months ago](https://wordpress.org/support/topic/w3c-validation-error-8/#post-4467694)
* Status: resolved