Because there are no websites with <script type=“text/x-common-lisp”> tags. No website require it so no browsers support it so no websites require it so…
If you made a browser run lisp, it would only be useful for web pages that are scripted with lisp. Most web sites are currently scripted in JavaScript. Adding lisp support to a browser is the easy part. It’s like deciding Latin is a better language then English, and then learning it. If you then came here and started using only Latin, it probably wouldn’t be very satisfying.
If no then why nobody has made it already?
Because there are no websites with <script type=“text/x-common-lisp”> tags. No website require it so no browsers support it so no websites require it so…
If you made a browser run lisp, it would only be useful for web pages that are scripted with lisp. Most web sites are currently scripted in JavaScript. Adding lisp support to a browser is the easy part. It’s like deciding Latin is a better language then English, and then learning it. If you then came here and started using only Latin, it probably wouldn’t be very satisfying.