1913262 - DragEvent's dataTransfer property is null for ondragend

Status: RESOLVED DUPLICATE of bug 1911486

(Core :: DOM: Copy & Paste and Drag & Drop, defect)

Description

[Jon Gan]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0

Steps to reproduce:

Set an EventListener breakpoint on dragend event on this page: https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/dragend_event, drag the example div, release and examine dataTransfer object.

Actual results:

dataTransfer property of DragEvent seems to be null although the specification requires it to be not null, if I understood it correctly.

Expected results:

Non-null dataTransfer object.

First discovered this issue through an exception thrown on Blazor WASM framework which I reported here: https://github.com/dotnet/aspnetcore/issues/57309#issuecomment-2286678267. AspNetCore maintainers believe its a FF bug which let me to report it here.

This issue seems to have been introduced only in 129. 128.0.3 did not exhibit this behaviour.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::JavaScript: WebAssembly' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.