Safari 10.1 `nomodule` support

// UPDATE: In 2023, you should probably stop using this! The narrow version of Safari that // does not support nomodule is probably not being used anywhere. The code below is left // for posterity.

/**

• Safari 10.1 supports modules, but does not support the nomodule attribute - it will

• load

• tags that load external code, e.g.: <script nomodule src="nomodule.js"></script>

• Again: this will not prevent inline script, e.g.:

• .

• This workaround is possible because Safari supports the non-standard 'beforeload' event.

• This allows us to trap the module and nomodule load.

• Note also that nomodule is supported in later versions of Safari - it's just 10.1 that

• omits this attribute. */ (function() { var check = document.createElement('script'); if (!('noModule' in check) && 'onbeforeload' in check) { var support = false; document.addEventListener('beforeload', function(e) { if (e.target === check) { support = true; } else if (!e.target.hasAttribute('nomodule') || !support) { return; } e.preventDefault(); }, true);

  check.type = 'module'; check.src = '.'; document.head.appendChild(check); check.remove(); } }());