[Webkit-unassigned] [Bug 258282] REGRESSION (STP 172): Broke custom element built-in polyfill by making form properties non deletable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258282

--- Comment #12 from Andrea Giammarchi <andrea.giammarchi at gmail.com> ---
with 1.2.0 I can reproduce the issue in Epiphany TP so I am not sure what you are testing ... the error is:

[Error] Unhandled Promise Rejection: TypeError: Unable to delete property.
        expando (index.js:271)
        _handle (index.js:418)
        notifier (index.js:213)
        parse (index.js:227)
        (anonymous function) (index.js:541)

and that's what everyone else witnessed before 1.2.1

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