dither toggle controls create large gaps in minimally-styled "reader" views

[jpco]

I first noticed this using https://github.com/j6k4m8/goosepaper to render pages from the RSS feed down to a PDF, but it's reproducible with Firefox's reader mode:

This seems to happens in views with minimal styling due to the .dither-toggle SVGs being defaulted to a width of 100% (though their content is shrunk down to zero pixels tall). For reasons I'm not clear on, those SVGs are interpreted as being "content" while the other SVGs aren't, but perhaps there's some invocation that can tell these interpreters otherwise.

Alternatively, a more brute-force fix could be to simply not include these dither-toggle controls at all in the HTML and only inject them with javascript on page load. This makes some sense given the controls don't actually do anything if the browser can't interpret javascript anyway.