When using this kind of notation:
<script defer src="https://use.fontawesome.com/releases/v5.3.1/js/all.js"></script>
a warning is logged: [xmldom warning] attribute "defer" missed value!! "defer" instead2!!
based on html specification https://html.spec.whatwg.org/#attr-script-defer this notation is valid.
So when the mimetype is text/html, I think that there is no warniogn log.
When using this kind of notation:
<script defer src="https://use.fontawesome.com/releases/v5.3.1/js/all.js"></script>a warning is logged:
[xmldom warning] attribute "defer" missed value!! "defer" instead2!!based on html specification https://html.spec.whatwg.org/#attr-script-defer this notation is valid.
So when the mimetype is
text/html, I think that there is no warniogn log.