Fix allowable properties for ::highlight pseudo-element

[SURYAS1306]

###Description

This PR corrects the “Allowable properties” section for the ::highlight pseudo-element.
It removes vendor-prefixed properties and updates the list to use the standard stroke-color, fill-color, and stroke-width properties.

###Motivation

The MDN page currently lists -webkit-text-* properties as allowable, which does not match the CSS specification.
This change aligns the documentation with the spec and prevents developers from relying on unsupported properties.

###Related issues and pull requests

Fixes #42863

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Web/CSS/Reference/Selectors/::highlight

Flaws (2)

Found an unexpected or unresolvable flaw? Please report it here.

URL: /en-US/docs/Web/CSS/Reference/Selectors/::highlight
Title: ::highlight()
Flaw count: 2

• macros:
  • Macro cssxref produces link /en-US/docs/Web/CSS/stroke-color which doesn't resolve
  • Macro cssxref produces link /en-US/docs/Web/CSS/fill-color which doesn't resolve

(comment last updated: 2026-02-10 20:46:51)

[estelle]

made a suggestion.
if the -webkit- aren't in the spec, we don't need to mention them

[estelle]

Suggested change

	- {{CSSxRef("stroke")}}, {{CSSxRef("fill")}}, and {{CSSxRef("stroke-width")}}
	Vendor-prefixed properties such as {{CSSxRef("-webkit-text-stroke-color")}} or {{CSSxRef("-webkit-text-fill-color")}} do not apply to highlight pseudo-elements.
	- {{CSSxRef("stroke-color")}}, {{CSSxRef("fill-color")}}, and {{CSSxRef("stroke-width")}}
	- Custom properties ({{cssxref("--*"))}}

[SURYAS1306]

Hi @estelle , I’ve removed the vendor-prefixed properties and kept only the spec-defined allowable properties. Please let me know if this looks good now. Thanks!

[estelle]

Hi @estelle , I’ve removed the vendor-prefixed properties and kept only the spec-defined allowable properties. Please let me know if this looks good now. Thanks!

I haven't tested them since they props only apply to svg, but the spec reads stroke-color and the pr has stroke. Also, the spec lists custom properties as supported props.

[flying-sheep]

@SURYAS1306 can you make these updates or should someone else fix this?

[SURYAS1306]

Hi @estelle,
I've updated the properties to stroke-color and fill-color as per the spec, and I also added the line for Custom Properties. Let me know if there's anything else.

@flying-sheep I have applied the updates

[pepelsbey]

Hey! Thank you for contributing 🙂

Unfortunately, it’s a little complicated:

• Only Safari supports the stroke-color property (currently not documented on MDN, unfortunately)
• No browser supports the fill-color property. It only exists in the spec for now.
• Only the stroke-width property is fine, well-supported, and documented.

So I wonder if we shouldn’t mention the fill-color property at all in this list, as it’s purely theoretical.

@estelle what do you think?