Title: Will someone fix this CSS?
Last modified: September 2, 2026

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# Will someone fix this CSS?

 *  [pavolknut](https://wordpress.org/support/users/pavolknut/)
 * (@pavolknut)
 * [2 days, 14 hours ago](https://wordpress.org/support/topic/will-someone-fix-this-css/)
 * I would love to see a fix in the core for /wp-includes/blocks/image/style.min.
   css and have someone validate this style. Problematic css deserves w3c validation.
   
   I get a lot of confusion in my work during audits.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fwill-someone-fix-this-css%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Moderator [threadi](https://wordpress.org/support/users/threadi/)
 * (@threadi)
 * [2 days, 12 hours ago](https://wordpress.org/support/topic/will-someone-fix-this-css/#post-19009277)
 * What exactly is problematic about the CSS there, and what would the fix look 
   like? If you already have that information, feel free to open a ticket in Core
   Trac and suggest it to the developers there as an optimization: [https://core.trac.wordpress.org/newticket](https://core.trac.wordpress.org/newticket)
 * Since this appears to be a Gutenberg component, however, their team might actually
   be the better point of contact for this: [https://github.com/WordPress/gutenberg/issues](https://github.com/WordPress/gutenberg/issues)
 *  [Avtar Bhumrah](https://wordpress.org/support/users/avtarbhumrah/)
 * (@avtarbhumrah)
 * [1 day, 4 hours ago](https://wordpress.org/support/topic/will-someone-fix-this-css/#post-19010851)
 * Hi,
 * I took a closer look at the stylesheet you referenced.
 * I can see that it uses several modern CSS features, including `:has()`, `@supports`,`
   env()`, `backdrop-filter`, and the `prefers-reduced-motion` media query.
 * However, looking at the stylesheet alone, I don’t see a specific CSS rule that
   I can confidently identify as incorrect. If the W3C validator is reporting an
   issue, could you share the exact validation error/warning and the affected line?
 * That would make it possible to determine whether there is an actual issue with
   the WordPress CSS or whether the validator is flagging a feature it does not 
   fully support yet. From there, a Core Trac or Gutenberg issue could be opened
   with a specific proposed fix if necessary.
 *  Thread Starter [pavolknut](https://wordpress.org/support/users/pavolknut/)
 * (@pavolknut)
 * [1 day, 3 hours ago](https://wordpress.org/support/topic/will-someone-fix-this-css/#post-19010892)
 * This is the power mapper report:
   `The CSS backdrop-filter: property is not supported
   by some browsers..has-nested-images figure.wp-block-image:before { backdrop-filter:
   blur(3px3px; }.wp-lightbox-container button { backdrop-filter: blur(16px16pxsaturate(
   180%180%; }
 * Invalid CSS url() value.
   `-webkit-mask-image: data:image/svg+xml;utf8,mask-image:
   data:image/svg+xml;utf8,This is what jigsaw.w3.org says for the address [https://photoknut.eu/wp-includes/blocks/image/style.min.css](https://photoknut.eu/wp-includes/blocks/image/style.min.css)
   The types are incompatible ))/2 + var(--wp--lightbox-initial-left-position)),
   calc(-50vh + var(--wp--lightbox-initial-top-position))) scale(var(--wp--lightbox-
   scale))The types are incompatible ))/2 + var(--wp--lightbox-initial-left-position)),
   calc(-50vh + var(--wp--lightbox-initial-top-position))) scale(var(--wp--lightbox-
   scale))
 * Thanks Guys
    -  This reply was modified 1 day, 3 hours ago by [pavolknut](https://wordpress.org/support/users/pavolknut/).
 *  Moderator [threadi](https://wordpress.org/support/users/threadi/)
 * (@threadi)
 * [22 hours, 25 minutes ago](https://wordpress.org/support/topic/will-someone-fix-this-css/#post-19011106)
 * The support page looks pretty good to me, though: [https://caniuse.com/?search=backdrop-filter](https://caniuse.com/?search=backdrop-filter)
 * This also meets WordPress’s requirements for supported browser versions; see:
   [https://make.wordpress.org/core/handbook/best-practices/browser-support/](https://make.wordpress.org/core/handbook/best-practices/browser-support/)
 * I therefore think it’s unlikely that a change will be made, but as I said, feel
   free to reach out to the Gutenberg team.

Viewing 4 replies - 1 through 4 (of 4 total)

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## Tags

 * [css](https://wordpress.org/support/topic-tag/css/)
 * [gutenberg](https://wordpress.org/support/topic-tag/gutenberg/)
 * [image block](https://wordpress.org/support/topic-tag/image-block/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 5 replies
 * 3 participants
 * Last reply from: [threadi](https://wordpress.org/support/users/threadi/)
 * Last activity: [22 hours, 25 minutes ago](https://wordpress.org/support/topic/will-someone-fix-this-css/#post-19011106)
 * Status: not resolved

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