content-visibility is a valid CSS property from 020W | Frank Conijn on 2026-08-13 (www-validator@w3.org from August 2026)

From: 020W | Frank Conijn <f.conijn@020webdesign.nl>
Date: Thu, 13 Aug 2026 14:16:28 +0200
To: <www-validator@w3.org>
Message-ID: <007401dd2b1d$91b299f0$b517cdd0$@020webdesign.nl>

Hello, 

 

 <https://html5.validator.nu/?doc=https%3A%2F%2Fde-interieurontwerper.nl%2F> https://html5.validator.nu/?doc=https%3A%2F%2Fde-interieurontwerper.nl%2F says that the CSS property content-visibility does not exist. But that’s incorrect; see https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/content-visibility. 

 

With kind regards, 

 

Frank Conijn

 <https://020webdesign.nl/> 020 Webdesign
Vrijzicht 66

1068CE  Amsterdam

The Netherlands

Tel. +31 20 610 5339

Received on Thursday, 13 August 2026 12:16:35 UTC