What I’ve always wanted is scheme in the browser.
> In 1995, Netscape hired Brendan Eich with the promise of letting him implement Scheme (a Lisp dialect) in the browser.
How JavaScript Was Created - http://speakingjs.com/es5/ch04.html
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> Whether that language should be Scheme was an open question, but Scheme was the bait I went for in joining Netscape. Previously, at SGI, Nick Thompson had turned me on to SICP.
> ..The diktat from upper engineering management was that the language must “look like Java”. That ruled out Perl, Python, and Tcl, along with Scheme.
<script type=“text/scheme”>
I also wish browsers had built out the ability to plug-in interpreters for processing script tags.