diff --git a/src/librustdoc/html/layout.rs b/src/librustdoc/html/layout.rs
index b5169b0599773..4458eea95f3e1 100644
--- a/src/librustdoc/html/layout.rs
+++ b/src/librustdoc/html/layout.rs
@@ -111,10 +111,7 @@ crate fn render<T: Print, S: Print>(
     <section id=\"search\" class=\"content hidden\"></section>\
     <section class=\"footer\"></section>\
     {after_content}\
-    <script>\
-        window.rootPath = \"{root_path}\";\
-        window.currentCrate = \"{krate}\";\
-    </script>\
+    <div id=\"rustdoc-vars\" data-root-path=\"{root_path}\" data-current-crate=\"{krate}\"></div>
     <script src=\"{static_root_path}main{suffix}.js\"></script>\
     {static_extra_scripts}\
     {extra_scripts}\
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 33639055b59ef..cfa6cd96595d6 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -1313,6 +1313,8 @@ fn init_id_map() -> FxHashMap<String, usize> {
     map.insert("toggle-all-docs".to_owned(), 1);
     map.insert("all-types".to_owned(), 1);
     map.insert("default-settings".to_owned(), 1);
+    map.insert("rustdoc-vars".to_owned(), 1);
+    map.insert("sidebar-vars".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);
diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 2db89e8a7ca68..03e091297e5b6 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -4216,11 +4216,8 @@ fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buffer, cache:
     let relpath = if it.is_mod() { "../" } else { "" };
     write!(
         buffer,
-        "<script>window.sidebarCurrent = {{\
-                name: \"{name}\", \
-                ty: \"{ty}\", \
-                relpath: \"{path}\"\
-            }};</script>",
+        "<div id=\"sidebar-vars\" data-name=\"{name}\" data-ty=\"{ty}\" data-relpath=\"{path}\">\
+        </div>",
         name = it.name.unwrap_or(kw::Empty),
         ty = it.type_(),
         path = relpath
diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 3ffb72ba3ee8b..78a825fcca0ba 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -1,5 +1,5 @@
 // From rust:
-/* global ALIASES, currentCrate, rootPath */
+/* global ALIASES */
 
 // Local js definitions:
 /* global addClass, getCurrentValue, hasClass */
@@ -40,6 +40,21 @@ if (!DOMTokenList.prototype.remove) {
     };
 }
 
+(function () {
+    var rustdocVars = document.getElementById("rustdoc-vars");
+    if (rustdocVars) {
+        window.rootPath = rustdocVars.attributes["data-root-path"].value;
+        window.currentCrate = rustdocVars.attributes["data-current-crate"].value;
+    }
+    var sidebarVars = document.getElementById("sidebar-vars");
+    if (sidebarVars) {
+        window.sidebarCurrent = {
+            name: sidebarVars.attributes["data-name"].value,
+            ty: sidebarVars.attributes["data-ty"].value,
+            relpath: sidebarVars.attributes["data-relpath"].value,
+        };
+    }
+}());
 
 // Gets the human-readable string for the virtual-key code of the
 // given KeyboardEvent, ev.
@@ -565,7 +580,7 @@ function defocusSearchBar() {
                 var i, match,
                     url = document.location.href,
                     stripped = "",
-                    len = rootPath.match(/\.\.\//g).length + 1;
+                    len = window.rootPath.match(/\.\.\//g).length + 1;
 
                 for (i = 0; i < len; ++i) {
                     match = url.match(/\/[^\/]*$/);
@@ -1504,15 +1519,15 @@ function defocusSearchBar() {
 
             if (type === "mod") {
                 displayPath = path + "::";
-                href = rootPath + path.replace(/::/g, "/") + "/" +
+                href = window.rootPath + path.replace(/::/g, "/") + "/" +
                        name + "/index.html";
             } else if (type === "primitive" || type === "keyword") {
                 displayPath = "";
-                href = rootPath + path.replace(/::/g, "/") +
+                href = window.rootPath + path.replace(/::/g, "/") +
                        "/" + type + "." + name + ".html";
             } else if (type === "externcrate") {
                 displayPath = "";
-                href = rootPath + name + "/index.html";
+                href = window.rootPath + name + "/index.html";
             } else if (item.parent !== undefined) {
                 var myparent = item.parent;
                 var anchor = "#" + type + "." + name;
@@ -1535,13 +1550,13 @@ function defocusSearchBar() {
                 } else {
                     displayPath = path + "::" + myparent.name + "::";
                 }
-                href = rootPath + path.replace(/::/g, "/") +
+                href = window.rootPath + path.replace(/::/g, "/") +
                        "/" + pageType +
                        "." + pageName +
                        ".html" + anchor;
             } else {
                 displayPath = item.path + "::";
-                href = rootPath + item.path.replace(/::/g, "/") +
+                href = window.rootPath + item.path.replace(/::/g, "/") +
                        "/" + type + "." + name + ".html";
             }
             return [displayPath, href];
@@ -1973,7 +1988,7 @@ function defocusSearchBar() {
         startSearch();
 
         // Draw a convenient sidebar of known crates if we have a listing
-        if (rootPath === "../" || rootPath === "./") {
+        if (window.rootPath === "../" || window.rootPath === "./") {
             var sidebar = document.getElementsByClassName("sidebar-elems")[0];
             if (sidebar) {
                 var div = document.createElement("div");
@@ -1992,11 +2007,11 @@ function defocusSearchBar() {
                 crates.sort();
                 for (var i = 0; i < crates.length; ++i) {
                     var klass = "crate";
-                    if (rootPath !== "./" && crates[i] === window.currentCrate) {
+                    if (window.rootPath !== "./" && crates[i] === window.currentCrate) {
                         klass += " current";
                     }
                     var link = document.createElement("a");
-                    link.href = rootPath + crates[i] + "/index.html";
+                    link.href = window.rootPath + crates[i] + "/index.html";
                     // The summary in the search index has HTML, so we need to
                     // dynamically render it as plaintext.
                     link.title = convertHTMLToPlaintext(rawSearchIndex[crates[i]].doc);
@@ -2118,7 +2133,7 @@ function defocusSearchBar() {
 
         var libs = Object.getOwnPropertyNames(imp);
         for (var i = 0, llength = libs.length; i < llength; ++i) {
-            if (libs[i] === currentCrate) { continue; }
+            if (libs[i] === window.currentCrate) { continue; }
             var structs = imp[libs[i]];
 
             struct_loop:
@@ -2143,7 +2158,7 @@ function defocusSearchBar() {
                     var href = elem.getAttribute("href");
 
                     if (href && href.indexOf("http") !== 0) {
-                        elem.setAttribute("href", rootPath + href);
+                        elem.setAttribute("href", window.rootPath + href);
                     }
                 });
 
diff --git a/src/tools/rustdoc-js/tester.js b/src/tools/rustdoc-js/tester.js
index 63f2d2f5d2f68..3f6bd60397526 100644
--- a/src/tools/rustdoc-js/tester.js
+++ b/src/tools/rustdoc-js/tester.js
@@ -263,8 +263,7 @@ function loadMainJsAndIndex(mainJs, searchIndex, storageJs, crate) {
                            "handleAliases", "getQuery", "buildIndex", "execQuery", "execSearch"];
 
     ALIASES = {};
-    finalJS += 'window = { "currentCrate": "' + crate + '" };\n';
-    finalJS += 'var rootPath = "../";\n';
+    finalJS += 'window = { "currentCrate": "' + crate + '", rootPath: "../" };\n';
     finalJS += loadThings(["hasOwnProperty", "onEach"], 'function', extractFunction, storageJs);
     finalJS += loadThings(arraysToLoad, 'array', extractArrayVariable, mainJs);
     finalJS += loadThings(variablesToLoad, 'variable', extractVariable, mainJs);