What does it mean to be "web-compatible"?

Adam Ahmed aahmed at atlassian.com
Tue Oct 7 14:27:39 PDT 2014

I got curious after reading the Array.prototype.contains thread.

I understand it means 'old things on the Web will break', but is there some
cutoff? Based on number sites or number of affected users?

Couldn't find a definition searching esdiscuss.org - apologies if it's been

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