Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Example cases are mostly when something is too large, e.g.:
- "too many switch cases",
- "too many parentheses in regular expression",
- "array initializer too large",
- "too much recursion".