diff --git a/src/librustdoc/config.rs b/src/librustdoc/config.rs
index 246e0ebbb2ba0..5df52e498b53d 100644
--- a/src/librustdoc/config.rs
+++ b/src/librustdoc/config.rs
@@ -507,7 +507,6 @@ impl Options {
         let edition = config::parse_crate_edition(&matches);
 
         let mut id_map = html::markdown::IdMap::new();
-        id_map.populate(&html::render::INITIAL_IDS);
         let external_html = match ExternalHtml::load(
             &matches.opt_strs("html-in-header"),
             &matches.opt_strs("html-before-content"),
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index cdccb1c858129..509f173055775 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -1356,6 +1356,9 @@ fn init_id_map() -> FxHashMap<String, usize> {
     map.insert("rustdoc-vars".to_owned(), 1);
     map.insert("sidebar-vars".to_owned(), 1);
     map.insert("copy-path".to_owned(), 1);
+    map.insert("help".to_owned(), 1);
+    map.insert("TOC".to_owned(), 1);
+    map.insert("render-detail".to_owned(), 1);
     // This is the list of IDs used by rustdoc sections.
     map.insert("fields".to_owned(), 1);
     map.insert("variants".to_owned(), 1);
@@ -1365,6 +1368,12 @@ fn init_id_map() -> FxHashMap<String, usize> {
     map.insert("trait-implementations".to_owned(), 1);
     map.insert("synthetic-implementations".to_owned(), 1);
     map.insert("blanket-implementations".to_owned(), 1);
+    map.insert("associated-types".to_owned(), 1);
+    map.insert("associated-const".to_owned(), 1);
+    map.insert("required-methods".to_owned(), 1);
+    map.insert("provided-methods".to_owned(), 1);
+    map.insert("implementors".to_owned(), 1);
+    map.insert("synthetic-implementors".to_owned(), 1);
     map
 }
 
@@ -1373,12 +1382,6 @@ impl IdMap {
         IdMap { map: init_id_map() }
     }
 
-    crate fn populate<I: IntoIterator<Item = S>, S: AsRef<str> + ToString>(&mut self, ids: I) {
-        for id in ids {
-            let _ = self.derive(id);
-        }
-    }
-
     crate fn derive<S: AsRef<str> + ToString>(&mut self, candidate: S) -> String {
         let id = match self.map.get_mut(candidate.as_ref()) {
             None => candidate.to_string(),
diff --git a/src/librustdoc/html/render/context.rs b/src/librustdoc/html/render/context.rs
index 07c850a20a9a4..1a993f360a166 100644
--- a/src/librustdoc/html/render/context.rs
+++ b/src/librustdoc/html/render/context.rs
@@ -18,7 +18,7 @@ use super::print_item::{full_path, item_path, print_item};
 use super::write_shared::write_shared;
 use super::{
     print_sidebar, settings, AllTypes, NameDoc, SharedContext, StylePath, BASIC_KEYWORDS,
-    CURRENT_DEPTH, INITIAL_IDS,
+    CURRENT_DEPTH,
 };
 
 use crate::clean::{self, AttributesExt};
@@ -423,14 +423,11 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
     }
 
     fn make_child_renderer(&self) -> Self {
-        let mut id_map = IdMap::new();
-        id_map.populate(&INITIAL_IDS);
-
         Self {
             current: self.current.clone(),
             dst: self.dst.clone(),
             render_redirect_pages: self.render_redirect_pages,
-            id_map: RefCell::new(id_map),
+            id_map: RefCell::new(IdMap::new()),
             deref_id_map: RefCell::new(FxHashMap::default()),
             shared: Rc::clone(&self.shared),
             cache: Rc::clone(&self.cache),
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 07bd26a4c5ebe..3a557a3f719b3 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -283,24 +283,6 @@ crate struct StylePath {
 
 thread_local!(crate static CURRENT_DEPTH: Cell<usize> = Cell::new(0));
 
-crate const INITIAL_IDS: [&'static str; 15] = [
-    "main",
-    "search",
-    "help",
-    "TOC",
-    "render-detail",
-    "associated-types",
-    "associated-const",
-    "required-methods",
-    "provided-methods",
-    "implementors",
-    "synthetic-implementors",
-    "implementors-list",
-    "synthetic-implementors-list",
-    "methods",
-    "implementations",
-];
-
 fn write_srclink(cx: &Context<'_>, item: &clean::Item, buf: &mut Buffer) {
     if let Some(l) = cx.src_href(item) {
         write!(buf, "<a class=\"srclink\" href=\"{}\" title=\"goto source code\">[src]</a>", l)