Wt

I tried to add a <script> tag in <head-matter> in wt_config.xml, but the XML parser turns a <script> tag with an empty body into a self-closing tag, which is not allowed by HTML.

We should make sure only tags that are allowed to be self-closing are self-closed. We already have a mechanism like this for our message resource bundles, so that can be reused.

Workaround: put a JavaScript comment in the <script> tag so it's non-empty.