`flex-start` and `flex-end` - No support data for these values
Open
@Elchi3 is already working on this.
Since Sep 3, 2026.
browser:multiple
data:css
p2
- Dominant language
- JSON
- Stars
- 5.8k
- Forks
- 2.6k
- Avg merge
- 1d 21h
- Merged PRs (30d)
- 186
Description
What type of issue is this?
Missing compatibility data
What information was incorrect, unhelpful, or incomplete?
I expected to find support data for the flex-start and flex-end CSS alignment values.
What browsers does this problem apply to, if applicable?
No response
What did you expect to see?
Perhaps keys such as:
css.properties.align-items.flex-end
css.properties.align-items.flex-start
css.properties.align-self.flex-end
css.properties.align-self.flex-start
css.properties.justify-items.flex-end
css.properties.justify-items.flex-start
css.properties.justify-self.flex-end
css.properties.justify-self.flex-start
There might be others. I'm not sure of every place where flex-start and -end might be needed.
Did you test this? If so, how?
I did a quick check with CSS.supports("align-items: flex-start") to confirm that it works in at least one browser (Firefox), but I'd expect the Collector to find and populate this data.
Can you link to any release notes, bugs, pull requests, or MDN pages related to this?
Specs:
- https://drafts.csswg.org/css-align/#valdef-self-position-flex-end
- https://drafts.csswg.org/css-align/#valdef-self-position-flex-start
Do you have anything more you want to share?
No response
MDN URL
No response
MDN metadata
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
This issue has not been assessed yet.