From 8b1bcc8d5ba65ecf6741436246ed27f74a71d40c Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Sun, 12 Nov 2023 23:21:21 -0700
Subject: [PATCH] rustdoc: use `.rustdoc` class instead of `body`

This didn't show up in our local tests, because the problem is actually
caused by docs.rs rewritten HTML (which relocates the classes that this
code looked for from the body tag to a child div).

Fixes #117290
---
 src/librustdoc/html/static/js/main.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/librustdoc/html/static/js/main.js b/src/librustdoc/html/static/js/main.js
index 7c052606abacb..615fb08c76f38 100644
--- a/src/librustdoc/html/static/js/main.js
+++ b/src/librustdoc/html/static/js/main.js
@@ -54,7 +54,7 @@ function setMobileTopbar() {
     if (mobileTopbar) {
         const mobileTitle = document.createElement("h2");
         mobileTitle.className = "location";
-        if (hasClass(document.body, "crate")) {
+        if (hasClass(document.querySelector(".rustdoc"), "crate")) {
             mobileTitle.innerText = `Crate ${window.currentCrate}`;
         } else if (locationTitle) {
             mobileTitle.innerHTML = locationTitle.innerHTML;
@@ -485,7 +485,7 @@ function preLoadCss(cssUrl) {
                 return;
             }
 
-            const modpath = hasClass(document.body, "mod") ? "../" : "";
+            const modpath = hasClass(document.querySelector(".rustdoc"), "mod") ? "../" : "";
 
             const h3 = document.createElement("h3");
             h3.innerHTML = `<a href="${modpath}index.html#${id}">${longty}</a>`;