As part of deprecating the `html()` function in favour of the `_html()` function in #364, I added a console warning when the `html()` function is now used that says that it is deprecated and that `_html()` or `xhtml()` should be used as alternatives.

It seemed misleading to allow the deprecation warning to print in the test output because the whole point of the test is to test the deprecated function, so I suppressed the console warning with a stub.