Agreed that we should not use markup in headings.

Maybe we can make the wording more explicit though. How about

imshow(): Behavior of parameters origin and extent

It would be best if this were fixed in sphinx-gallery; never know if we might accidentally introduce formatting in a title somewhere later, even if we fix them all now.

The question generally is how? While emphasis may be viable, do you really want to have links, literal code etc in a title?

We already disallow links in headings, but it's only enforced when we notice it. For the sphinx-gallery cards, it'd be better to strip all formatting.

My intention when opening this issue was not so much to change the examples and tutorials but restore the behavior of sg < 0.11.0 where any formatting was stripped from the title, see the old docs:

The question was more if this could be achieved by some CSS voodoo on the part of matplotlib instead of waiting for a fix in sg.

This would need to be addressed in Sphinx-gallery.

I've opened an issue there: sphinx-gallery/sphinx-gallery#1002

The original example above has no thumbnail anymore (due to #25395). With Sphinx Gallery 0.12.2 and sphinx-gallery/sphinx-gallery#1108 there's only a single case left which will be fixed by #25508 .