LGTM3
On 3/9/26 2:54 p.m., 'Dan Clark' via blink-dev wrote:
LGTM2
On Monday, March 9, 2026 at 11:54:41 AM UTC-7 [email protected] wrote:
LGTM1.
Thanks for fixing long-standing compat issues. Deeply appreciated.
Best,
Alex
On Monday, March 9, 2026 at 9:53:11 AM UTC-7 Chromestatus wrote:
*Contact emails*
[email protected], [email protected]
*Specification*
https://html.spec.whatwg.org/multipage/dnd.html#dndevents
*Summary*
The drag and drop specifications require the "dataTransfer"'s
object "dropEffect" attribute to have certain predetermined
values on "dragEnter", "dragOver" and "dragLeave". Drag enter
and drag over should have a "dropEffect" based on the current
"effectAllowed", and "dragLeave" should always have a "none"
"dropEffect". Currently, Chromium doesn't adhere to these
rules. With the launch of this feature, Chromium will start
respecting the specification and assigning the correct values
to this attribute so that web developers can start relying on it.
*Blink component*
Blink>DataTransfer
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EDataTransfer%22>
*Web Feature ID*
draganddrop <https://webstatus.dev/features/draganddrop>
*Motivation*
Many bug reports have been filed over the years by developers
being affected by the lack of a correct dropEffect
implementation:
https://issues.chromium.org/issues?q=title:*dropEffect*
*Initial public proposal*
/No information provided/
*TAG review*
/No information provided/
*TAG review status*
Not applicable
*Risks*
*Interoperability and Compatibility*
None. Drop effect is reported as working properly in Firefox
and Safari
/Gecko/: Shipped/Shipping
/WebKit/: Shipped/Shipping
/Web developers/: Strongly positive Visiting the crbug query
linked in the "Motivation" section will show strong sentiment
from web developers in wanting this fixed.
/Other signals/:
*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. Should any implementation issue be found, we have a
feature flag acting as a kill switch (SetDefaultDropEffect).
*Debuggability*
No additional functionality is needed to be added to debug
this feature
*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>?*
Yes
* WPT: "dropEffect" and "effectAllowed" are tested in:
https://wpt.fyi/results/html/editing/dnd/drop?label=master&label=experimental&aligned
<https://wpt.fyi/results/html/editing/dnd/drop?label=master&label=experimental&aligned>
* Other tests: We have unit tests
(drag_and_drop_interactive_uitest.cc) and blink web tests
(third_party/blink/web_tests/fast/dnd/*) verifying the correct
functioning of this behavior.
*Flag name on about://flags*
None
*Finch feature name*
SetDefaultDropEffect
*Non-finch justification*
The feature will be shipped enabled by default to be used as a
kill-switch in case a severe issue is discovered.
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/434151262
*Estimated milestones*
Shipping on desktop 148
Shipping on Android 148
*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).
N/A
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/6325617459068928?gate=6549835522113536
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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