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Add new "hide deprecated items" setting in rustdoc This PR adds a new JS setting which allows the JS to hide deprecated items. This is especially useful for crates like `std` which accumulates deprecated items but never removes them. Nicely enough, the "deprecation" information was already in the search index, meaning I didn't need to change anything there. Before this PR, it was only used to make the deprecated items rank lower. Well now it's also used to generate an extra CSS class, allowing the JS setting to work. This is taking over https://github.com/rust-lang/rust/pull/149551. This feature got approved by the rustdoc team in the [meeting of december](https://rust-lang.zulipchat.com/#narrow/channel/393423-t-rustdoc.2Fmeetings/topic/2025-12-08/near/562553156). You can give it a try [here](https://rustdoc.crud.net/imperio/hide-deprecated-items/foo/index.html). r? @lolbinarycat
The tests present here are used to test the generated HTML from rustdoc. The goal is to prevent unsound/unexpected GUI changes.
This is using the browser-ui-test framework to do so. It works as follows:
It wraps puppeteer to send commands to a web browser in order to navigate and test what's being currently displayed in the web page.
You can find more information and its documentation in its repository.
If you need to have more information on the tests run, you can use --test-args:
$ ./x.py test tests/rustdoc-gui --stage 1 --test-args --debug
If you don't want to run in headless mode (helpful to debug sometimes), you can use
--no-headless:
$ ./x.py test tests/rustdoc-gui --stage 1 --test-args --no-headless
To see the supported options, use --help.