Under MW 1.29.1, if I insert a template literal (surrounded by backticks) into a script in the MediaWiki namespace, the ResourceLoader gives a parse error.
This is the Javascript code:
function newMenuHTML (tools) {
return `
<menu>
<ul>
<li></li>
</ul>
<menu>`;
} // -- function newMenuHTML (tools)And this is the error, which I can see in the browser console:
JavaScript parse error: Parse error: Illegal token in file 'MediaWiki:Gadget-edit2.js' on line 39 load.php:75:1064 <анонимная> https://domain.name/w/load.php:75:1064 runScript/< https://domain.name/w/load.php:161:89 fire https://domain.name/w/load.php:45:104 add https://domain.name/w/load.php:45:656 always https://domain.name/w/load.php:46:865 runScript https://domain.name/w/load.php:160:944 checkCssHandles https://domain.name/w/load.php:161:678 cssHandle/< https://domain.name/w/load.php:161:808 fire https://domain.name/w/load.php:45:104 fireWith https://domain.name/w/load.php:46:431 fire https://domain.name/w/load.php:46:474 fireCallbacks https://domain.name/w/load.php:156:320 addEmbeddedCSS https://domain.name/w/load.php:156:661 addEmbeddedCSS/cssBufferTimer< https://domain.name/w/load.php:156:538