Remove 'border' from list of properties that can be given a 'url()'#44671
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The `border` shorthand is explicitly NOT able to take a `url()`. It is a shorthand for `border-width`, `border-color`, and `border-style` only. It can only (un-)set `border-image` _implicitly_, and is in fact required to do so. Any use of `border` resets the value of `border-image` back to its initial value, by requirement of the spec. Reference: CSS Backgrounds and Borders Module Level 3 https://www.w3.org/TR/css-backgrounds-3/#border-shorthands
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(comment last updated: 2026-07-09 04:18:10) |
chrisdavidmills
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Jul 9, 2026
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This makes total sense. Good catch, @ferdnyc, thanks for the update.
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Description
Page: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/url_function
In the CSS
url()documentation, removeborderfrom a list of properties that can be given aurl()as their value (or part thereof).Motivation
The Backgrounds & Borders Module Level 3 spec explicitly prohibits
borderfrom accepting aurl()argument. It is a shorthand forborder-width,border-color, andborder-styleonly, and is required to implicitly reset the correspondingborder-imageproperties back to their initial value whenever it is used.Additional details
Relevant section of the spec: CSS Backgrounds and Borders Module Level 3, § Border Shorthand Properties
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