<style type='text/css'> should be <style scoped> in wp-includes/media.php

[La Geek]

You can't see it in theme "twenty fourteen". But if you activate e.g. genesis, you'll get a valdiation error -> "Element style is missing required attribute scoped."

This error is a result of line 1015 in wp-includes/media.php of WP 3.9 final version

if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
		$gallery_style = "
		<style type='text/css'>
			#{$selector} {
				margin: auto;
			}

Change <style type='text/css'> to <style scoped> and the validation error is fixed. More informations -> ​http://html5doctor.com/the-scoped-attribute/

I would apply a patch, if I would know, how to do this here. This here is not github. And on github I pulled wp 4.0, for this I could do a patch. But I guess here is another tracking and subversion system so I am lost. However it is only one line, that must be changed, so no big deal also without a patch of mine :)

[La Geek]

Replying to La Geek:

Sorry, I forgot to mention, that this error appears with inserted gallery.

[sabreuse]

<style scoped> is currently Firefox only, with 13% browser support. Suggest holding off on this until it becomes clear that other browsers will be supporting it.

[La Geek]

Sorry for my typo, it's named scoped and not scope.

Sabreuse, you are totally right, therefore I wrote the link of html5doctor, where you can read the same. More then this the article contains a workaround/link "jQuery Scoped CSS plugin". Something like a polyfill.

It's no good practise to get W3C errors. The best way would be, to avoid inline styles. But I don't know, why they exist at all in media.php - so I can't judge it.

[MikeHansenMe]

As @sabreuse said this is still very limited. Here is the caniuse link.

​http://caniuse.com/style-scoped

[nacin]

Because HTML5 gallery support in 3.9 removes this inline style, I think this is a wontfix.

[SergeyBiryukov]

Duplicate of #10734.