What is non-standard (non-standard) in Javscript api?

mdn document: introduction to console.dir
https://developer.mozilla.org.

it is said that this attribute is a Non-standard standard. How is this "non-standard" defined, and what is a "standard"?
Thank you, front-end bosses, tipped

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my understanding is that it is not standardized, that is, only some browsers support it, because there is no standardization, other browser vendors are unlikely to follow, resulting in poor compatibility of these features. To use these features, you should carefully test your target browser.


Standard

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36bc9-405c5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36bc9-405c5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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