The W3C Validation (https://validator.w3.org/) show errors in the components.css of webflow.
font-smoothing and tap-highlight-color does not exist. Here ist my test:
Here is my site Read-Only: LINK
(how to share your site Read-Only link)
W3C Validation Service: Error in "font-smoothing" and "tap-highlight-color" (Property doesn't exist)
Both of these properties are non-standard. Some browsers support these non-standard properties.
If a browser does not support the property, it will ignore it. The use of non-standard properties is not a bug, it is a choice within the webfow CSS core, which was based on vendor support at some point.
Since the site you referenced is self-hosted, and the CSS is local to it, you can remove those properties from your CSS, if validation is your goal.
More information about these properties is available at font-smooth - CSS: Cascading Style Sheets | MDN and -webkit-tap-highlight-color - CSS: Cascading Style Sheets | MDN
I am moving this topic to the Feedback category. Thanks for sharing.
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