In HTML, there are tags which are always self-closed. For example, <hr>Some content here</hr>
does not make any sense. In the same way, there are tags which cannot be self-closed. <script>
tag is one of them.
I am not sure about the reason of no self-closed <script>
tags, but the reason might come from the fact that the tag was intended to always contain code inside. Again, I’m not sure.