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[css-borders-4] Adjust border-width zero value special case per WG resolution. #11494 #13208

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Merged
SebastianZ merged 1 commit into from
Dec 13, 2025
Merged

[css-borders-4] Adjust border-width zero value special case per WG resolution. #11494 #13208

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10 changes: 9 additions & 1 deletion css-borders-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -370,7 +370,7 @@ Line Thickness: the 'border-width' properties</h3>
Inherited: no
Logical property group: border-width
Percentages: N/A
Computed value: absolute length, [=snapped as a border width=]; zero if the border style is ''border-style/none'' or ''border-style/hidden''
Computed value: absolute length, [=snapped as a border width=]
Animation Type: by computed value
</pre>

Expand All @@ -385,6 +385,11 @@ Line Thickness: the 'border-width' properties</h3>
The <dfn>thin</dfn>, <dfn>medium</dfn>, and <dfn>thick</dfn> keywords
are equivalent to ''1px'', ''3px'', and ''5px'', respectively.

The [=resolved value=] for the 'border-width' properties is the [=used value=].

If the 'border-style' corresponding to a given 'border-width' is ''border-style/none'' or ''border-style/hidden'',
then the [=used value|used=] width is 0.

The [=flow-relative=] properties
'border-block-start-width',
'border-block-end-width',
Expand Down Expand Up @@ -3239,6 +3244,9 @@ First Public Working Draft</a> of 22 July 2025
* Renamed <css>normal</css> value of 'border-*-clip' properties to ''border-top-clip/none''
* Added new syntax for 'border-*-*-radius' longhands using a slash to separate horizontal and vertical radii
* Allowed a single <<length>> value for 'box-shadow-offset' to set both offsets to the same value
* Changed the special case of 'border-width' having a value of ''0'' when 'border-style' is ''border-style/none'' or ''border-style/hidden''
from a computed-value effect to a resolved-value effect.
(<a href="https://github.com/w3c/csswg-drafts/issues/11494">Issue 11494</a>)

<h3 class=no-num id="level-changes">
Additions since [[CSS3BG]]</h3>
Expand Down