Since 2019 in the leading browsers (Firefox and Chromium); 2020 if you use something else like Edge or Samsung Internet; 2021 for Chrome or Firefox on mobile...

Since 2019 in the leading browsers (Firefox and Chromium); 2020 if you use something else like Edge or Samsung Internet; 2021 for Chrome or Firefox on mobile... and of course you can forget about MSIE or Opera Mobile support as usual. https://caniuse.com/mdn-javascript_grammar_numeric_separators https://caniuse.com/mdn-javascript_grammar_numeric_separator...