Re: [w3ctag/design-reviews] Element Timing API for img (#326)

> Not sure I understand what you mean by ‘leak’ here? Javascript should intentionally query for entries or use PerformanceObserver in order to obtain the entries.

Leak was a poor choice of words. The concern is the potential overhead of having this enabled on a element, and libraries/components sloppily being released in the equivalent of debug mode. It feels like the top level should be able to flip the switch off to reduce overhead.

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