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Safari 10.1 `nomodule` support
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/** | |
* Safari 10.1 supports modules, but does not support the `nomodule` attribute - it will | |
* load <script nomodule> anyway. This snippet solve this problem, but only for script | |
* tags that load external code, e.g.: <script nomodule src="nomodule.js"></script> | |
* | |
* Again: this will **not** prevent inline script, e.g.: | |
* <script nomodule>alert('no modules');</script>. | |
* | |
* 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(); | |
} | |
}()); |
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/** | |
* Minified-ish version of the above. | |
*/ | |
(function() { | |
var d = document; | |
var c = d.createElement('script'); | |
if (!('noModule' in c) && 'onbeforeload' in c) { | |
var s = false; | |
d.addEventListener('beforeload', function(e) { | |
if (e.target === c) { | |
s = true; | |
} else if (!e.target.hasAttribute('nomodule') || !s) { | |
return; | |
} | |
e.preventDefault(); | |
}, true); | |
c.type = 'module'; | |
c.src = '.'; | |
d.head.appendChild(c); | |
c.remove(); | |
} | |
}()); |
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