[Webkit-unassigned] [Bug 263960] [CSSOM] Stylesheet::insertRule shoud return index on successful insertion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=263960

--- Comment #2 from Matthieu Dubet <m_dubet at apple.com> ---
It's already the case 

https://github.com/WebKit/WebKit/blob/399d66f88e336da795cf2ed2836dee80af046b19/Source/WebCore/css/CSSStyleSheet.cpp#L367


And addRule returns -1 per spec

https://drafts.csswg.org/cssom/#insert-a-css-rule:~:text=index%20as%20arguments.-,Return%20%2D1.,-Authors%20should%20not

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