30 ms·strict mode is the default in everything now and had been for many many years.by JoyrexJ9 5y agostrict mode is the default in everything now and had been for many many years.icedchai 5y agoIt isn't the default for a browser "<script>" tag.xigoi 5y agoIt's the default for <script type="module">, which you should use anyway for anything serious.