Some changes occurred in HTML/CSS/JS.

cc @GuillaumeGomez, @lolbinarycat

Gonna let Guillaume r+, but looks good to me!

Just commented about this here. I'd personally just make the update without gating it behind next edition but seems like something worth discussing with the rest of the team.

☔ The latest upstream changes (presumably #150645) made this pull request unmergeable. Please resolve the merge conflicts.

This was discussed in this month's t-rustdoc meeting, the consensus was the edition gating should be removed and the "future edition" behavior should apply to all editions.

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

The job aarch64-gnu-llvm-20-2 failed! Check out the build log: (web) (plain enhanced) (plain)

failures:

---- html::markdown::tests::test_markdown_html_escape stdout ----

thread 'html::markdown::tests::test_markdown_html_escape' (58277) panicked at src/librustdoc/html/markdown/tests.rs:475:9:
assertion `left == right` failed: original: `Struct<'a, T>`
  left: "<p><code>Struct&lt;'a, T&gt;</code></p>\n"
 right: "<p><code>Struct&lt;'a, T&gt;</code></p>"
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::panicking::assert_failed_inner
   3: core::panicking::assert_failed::<alloc::string::String, alloc::string::String>