It's currently a "living standard" that is not versioned. To get the idea about support of e.g. ECMAScript 2025 (ES16) features, see: https://caniuse.com/?feats=mdn-javascript_builtins_iterator%2Cwf-set-methods%2Cwf-regexp-escape%2Cmdn-javascript_regular_expressions_modifier%2Cmdn-javascript_regular_expressions_named_capturing_group_duplicate_named_capturing_groups%2Cwf-promise-try%2Cwf-float16array%2Cmdn-javascript_builtins_dataview_getfloat16%2Cmdn-javascript_builtins_dataview_setfloat16%2Cmdn-javascript_builtins_math_f16round