Improve XSLTProcessor notes (#10690)
Improve XSLTProcessor notes (#10690)

A space after </code> was missing, but while in the area...

Test for whether non-string parameters are supported:
http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=9342

Test for whether transformTo* throws or return null on error:
http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=9344

Testing revealed the following:
- Safari 14.1 only supports string values and return null on error.
  This matches Chrome, as expected since this started out in WebKit.
- Edge 18 only supports string values and return null on error.
- Opera 12.16 only supports string values, but throws on error.

This unfortunately requires more notes for Opera in order to capture
what happened.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data