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PerformanceContainerTiming.toJSON() redefined - #30451
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Elchi3 merged 1 commit intoSep 8, 2026
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We had the same topic in #30334.
@tunetheweb does the spec need fixing here?
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Yup. And there's an open issue for that: w3c/container-timing#70 I've confirmed that both Chrome and Firefox have implemented the overridden method. I presumed they were just using the PerformanceEntry default when I added this to BCD since it wasn't in the spec so didn't add it then. Good spot @hamishwillee ! So yes this should be added to BCD as non-standard for now, until it's added to the spec. FYI: @jasonwilliams |
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FF156 adds support for
PerformanceContainerTimingbehind a pref. Most features were updated already, but omitstoJSON()which has been defined on the object too.This is not in the spec, but testing shows it is has been redefined on the object in FF (in devtools) and in the Chromium source code. This is non-standard because the redefinition is not indicated by the spec IDL. Claude tells me this is likely a spec ommission.
As such I have marked this as non-standard.
Note that the errors on the tagging predate my change.
Related docs work can be tracked in mdn/content#45428