What's the status of the spec PR?
On 9/4/25 9:54 p.m., TAMURA, Kent wrote:
LGTM1. The consistent behavior is reasonable, and the compatibility
risk looks very small.
On Fri, Sep 5, 2025 at 2:42 AM Joey Arhar <[email protected]> wrote:
Contact emails
[email protected]
Explainer
https://github.com/whatwg/html/issues/8189#issuecomment-2877242732
Specification
https://github.com/whatwg/html/pull/11460
Summary
By using the size and multiple attributes, the select element can
be rendered as an in-page listbox or a button with a popup.
However, these modes are not consistently available across mobile
and desktop chrome. Currently, in-page listbox rendering is not
available on mobile, and button with popup is not available on
desktop when the multiple attribute is present. This feature adds
the listbox to mobile and adds a multi-select popup to desktop,
and makes the opt-ins with the size and multiple attributes result
in the same rendering mode across mobile and desktop. Here is a
summary of the changes: - When the size attribute has a value
greater than 1, in-page rendering will always be used. Previously,
this was ignored on mobile and always resulted in a popup. - When
the multiple attribute is set with no size attribute, in-page
rendering will be used. Previously, this was a popup instead of an
in-page listbox on mobile. - When the multiple attribute is set
with size=1, a popup will be used. Previously, this was an in-page
listbox on desktop. By making this change, we are providing a
foundation to bring customizable select to in-page rendering and
multi-select. Customizable select currently only works for
single-selects with a popup.
Here is a screenshot of the new multi-select popup for desktop,
which you'll get with <select multiple size=1>. This was created
to reach parity with the previously existing multi-select popup on
android.
479732188-e42f4512-1059-4bae-85ed-00e2dee2a967.png
Blink component
Blink>Forms>Select
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EForms%3ESelect%22>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
Interop risk is low because of the positive standards position
from Mozilla and the lack of blocking feedback from Apple in many
standards discussions. There is a compat risk of breaking existing
usage of select multiple on mobile which currently always uses a
picker but will be changed to use the in-page listbox to match
desktop. If there are any mobile sites relying on this particular
rendering mode, they will have to add the size=1 attribute to
their select element. I added a UseCounter to see how often users
open a select multiple picker on mobile, and the usage is quite
low: https://chromestatus.com/metrics/feature/timeline/popularity/5549
/Gecko/: Positive
(https://github.com/mozilla/standards-positions/issues/1274)
/WebKit/: No signal
(https://github.com/WebKit/standards-positions/issues/532)
/Web developers/: No signals
/Other signals/:
Ergonomics
I expect the in-page rendering mode to be used in tandem with
customizable select in the future when customizable select is
expanded to include the in-page listbox rendering mode. The
default usage of this API will not make it hard for chrome to
maintain good performance.
Activation
It will not be challenging for developers to take advantage of
this feature immediately.
Security
I don't believe there are any security risks for this feature.
WebView application risks
Does this intent deprecate or change behavior of existing APIs,
such that it has potentially high risk for Android WebView-based
applications?
None
Debuggability
DevTools shows the attributes on the select element in the
elements panel, but doesn't explain the logic for how the size and
multiple attributes result in the different rendering modes. I
expect this to be documented on MDN so developers can learn how to
control this.
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
There is not a good way to test the native appearance of the
select element, and there is no way to test whether the select
element is in a mode which supports a picker or not.
Flag name on about://flags
None
Finch feature name
SelectMobileDesktopParity
Rollout plan
(RARE) Experiment users ramp up over time
Requires code in //chrome?
False
Tracking bug
https://issues.chromium.org/issues/439964654
Estimated milestones
Finch in 141, enable by default in 142
Anticipated spec changes
Open questions about a feature may be a source of future web
compat or interop issues. Please list open issues (e.g. links to
known github issues in the project for the feature specification)
whose resolution may introduce web compat/interop risk (e.g.,
changing to naming or structure of the API in a
non-backward-compatible way).
None
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5412736871825408?gate=6327273552740352
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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TAMURA Kent
Software Engineer, Google
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