css.properties.text-autospace.{insert,replace,punctuation} – Safari does not support these values

[pan93412]

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

Tested on Safari 26.1 and Technology Preview Release 228 (WebKit 21623.1.7.19.1). It seems these features were never implemented, as the corresponding PR (#26039, "Updates for Safari 18.4 beta") did not mention them. Additionally, these flags were introduced by #27726 ("Firefox Nightly supports CSS text-autospace behind flag"), which is unrelated to Safari.

According to #26039, Safari might only implemented:

• css.properties.text-autospace
• css.properties.text-autospace.auto
• css.properties.text-autospace.ideograph-alpha
• css.properties.text-autospace.ideograph-numeric
• css.properties.text-autospace.no-autospace
• css.properties.text-autospace.normal

What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

Did you test this? If so, how?

See the section, "What information was incorrect, unhelpful, or incomplete?"

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/CSS/text-autospace

Do you have anything more you want to share?

No response

MDN URL

No response

MDN metadata

No response

[caugner]

Confirmed via Safari 18.4 on BrowserStack Live:

Same result in Safari 26.0: