diff --git a/Cargo.lock b/Cargo.lock
index 0446bae5..82dfa8c6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -28,9 +28,9 @@ dependencies = [
 
 [[package]]
 name = "ansi_term"
-version = "0.11.0"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
 dependencies = [
  "winapi 0.3.9",
 ]
@@ -228,10 +228,10 @@ dependencies = [
 ]
 
 [[package]]
-name = "difference"
-version = "2.0.0"
+name = "diff"
+version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
+checksum = "0e25ea47919b1560c4e3b7fe0aaab9becf5b84a10325ddf7db0f0ba5e1026499"
 
 [[package]]
 name = "difflib"
@@ -283,9 +283,9 @@ dependencies = [
 
 [[package]]
 name = "env_logger"
-version = "0.7.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+checksum = "0b2cf0344971ee6c64c31be0d530793fba457d322dfec2810c453d0ef228f9c3"
 dependencies = [
  "atty",
  "humantime",
@@ -382,25 +382,11 @@ dependencies = [
  "new_debug_unreachable",
 ]
 
-[[package]]
-name = "futures"
-version = "0.3.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1adc00f486adfc9ce99f77d717836f0c5aa84965eb0b4f051f4e83f7cab53f8b"
-dependencies = [
- "futures-channel",
- "futures-core",
- "futures-io",
- "futures-sink",
- "futures-task",
- "futures-util",
-]
-
 [[package]]
 name = "futures-channel"
-version = "0.3.16"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74ed2411805f6e4e3d9bc904c95d5d423b89b3b25dc0250aa74729de20629ff9"
+checksum = "c3083ce4b914124575708913bca19bfe887522d6e2e6d0952943f5eac4a74010"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -408,15 +394,9 @@ dependencies = [
 
 [[package]]
 name = "futures-core"
-version = "0.3.16"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af51b1b4a7fdff033703db39de8802c673eb91855f2e0d47dcf3bf2c0ef01f99"
-
-[[package]]
-name = "futures-io"
-version = "0.3.16"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b0e06c393068f3a6ef246c75cdca793d6a46347e75286933e5e75fd2fd11582"
+checksum = "0c09fd04b7e4073ac7156a9539b57a484a8ea920f79c7c675d05d289ab6110d3"
 
 [[package]]
 name = "futures-macro"
@@ -433,9 +413,9 @@ dependencies = [
 
 [[package]]
 name = "futures-sink"
-version = "0.3.16"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0f30aaa67363d119812743aa5f33c201a7a66329f97d1a887022971feea4b53"
+checksum = "21163e139fa306126e6eedaf49ecdb4588f939600f0b1e770f4205ee4b7fa868"
 
 [[package]]
 name = "futures-task"
@@ -545,7 +525,7 @@ dependencies = [
  "log",
  "pest",
  "pest_derive",
- "quick-error 2.0.1",
+ "quick-error",
  "serde",
  "serde_json",
 ]
@@ -640,12 +620,9 @@ checksum = "6456b8a6c8f33fee7d958fcd1b60d55b11940a79e63ae87013e6d22e26034440"
 
 [[package]]
 name = "humantime"
-version = "1.3.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
-dependencies = [
- "quick-error 1.2.3",
-]
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
 [[package]]
 name = "hyper"
@@ -712,15 +689,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "input_buffer"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f97967975f448f1a7ddb12b0bc41069d09ed6a1c161a92687e057325db35d413"
-dependencies = [
- "bytes",
-]
-
 [[package]]
 name = "iovec"
 version = "0.1.4"
@@ -1232,13 +1200,13 @@ dependencies = [
 
 [[package]]
 name = "pretty_assertions"
-version = "0.6.1"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
+checksum = "c89f989ac94207d048d92db058e4f6ec7342b0971fc58d1271ca148b799b3563"
 dependencies = [
  "ansi_term",
  "ctor",
- "difference",
+ "diff",
  "output_vt100",
 ]
 
@@ -1274,12 +1242,6 @@ dependencies = [
  "unicase",
 ]
 
-[[package]]
-name = "quick-error"
-version = "1.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
-
 [[package]]
 name = "quick-error"
 version = "2.0.1"
@@ -1643,6 +1605,26 @@ version = "0.14.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"
 
+[[package]]
+name = "thiserror"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd829fe32373d27f76265620b5309d0340cb8550f523c1dda251d6298069069a"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0396bc89e626244658bef819e22d0cc459e795a5ebe878e6ec336d1674a8d79a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "time"
 version = "0.1.43"
@@ -1670,11 +1652,10 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.10.0"
+version = "1.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01cf844b23c6131f624accf65ce0e4e9956a8bb329400ea5bcc26ae3a5c20b0b"
+checksum = "0c27a64b625de6d309e8c57716ba93021dccf1b3b5c97edd6d3dd2d2135afc0a"
 dependencies = [
- "autocfg",
  "bytes",
  "libc",
  "memchr",
@@ -1687,9 +1668,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-macros"
-version = "1.3.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "54473be61f4ebe4efd09cec9bd5d16fa51d70ea0192213d754d2d500457db110"
+checksum = "9724f9a975fb987ef7a3cd9be0350edcbe130698af5b8f7a631e23d42d052484"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1709,9 +1690,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-tungstenite"
-version = "0.13.0"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1a5f475f1b9d077ea1017ecbc60890fda8e54942d680ca0b1d2b47cfa2d861b"
+checksum = "511de3f85caf1c98983545490c3d09685fa8eb634e57eec22bb4db271f46cbd8"
 dependencies = [
  "futures-util",
  "log",
@@ -1790,19 +1771,19 @@ checksum = "59547bce71d9c38b83d9c0e92b6066c4253371f15005def0c30d9657f50c7642"
 
 [[package]]
 name = "tungstenite"
-version = "0.12.0"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ada8297e8d70872fa9a551d93250a9f407beb9f37ef86494eb20012a2ff7c24"
+checksum = "a0b2d8558abd2e276b0a8df5c05a2ec762609344191e5fd23e292c910e9165b5"
 dependencies = [
  "base64",
  "byteorder",
  "bytes",
  "http",
  "httparse",
- "input_buffer",
  "log",
  "rand 0.8.4",
  "sha-1 0.9.7",
+ "thiserror",
  "url",
  "utf-8",
 ]
@@ -1905,12 +1886,13 @@ dependencies = [
 
 [[package]]
 name = "warp"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "332d47745e9a0c38636dbd454729b147d16bd1ed08ae67b3ab281c4506771054"
+checksum = "3cef4e1e9114a4b7f1ac799f16ce71c14de5778500c5450ec6b7b920c55b587e"
 dependencies = [
  "bytes",
- "futures",
+ "futures-channel",
+ "futures-util",
  "headers",
  "http",
  "hyper",
diff --git a/Cargo.toml b/Cargo.toml
index e3e8a32e..0b54b5ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ anyhow = "1.0.28"
 chrono = "0.4"
 clap = { version = "3.0", features = ["cargo"] }
 clap_complete = "3.0"
-env_logger = "0.7.1"
+env_logger = "0.9.0"
 handlebars = "4.0"
 lazy_static = "1.0"
 log = "0.4"
@@ -42,7 +42,7 @@ gitignore = { version = "1.0", optional = true }
 # Serve feature
 futures-util = { version = "0.3.4", optional = true }
 tokio = { version = "1", features = ["macros", "rt-multi-thread"], optional = true }
-warp = { version = "0.3.1", default-features = false, features = ["websocket"], optional = true }
+warp = { version = "0.3.2", default-features = false, features = ["websocket"], optional = true }
 
 # Search feature
 elasticlunr-rs = { version = "3.0.0", optional = true }
@@ -53,7 +53,7 @@ assert_cmd = "1"
 predicates = "2"
 select = "0.5"
 semver = "1.0"
-pretty_assertions = "0.6"
+pretty_assertions = "1.2.1"
 walkdir = "2.0"
 
 [features]
diff --git a/guide/src/guide/installation.md b/guide/src/guide/installation.md
index d7946587..128b1047 100644
--- a/guide/src/guide/installation.md
+++ b/guide/src/guide/installation.md
@@ -30,6 +30,8 @@ cargo install mdbook
 
 This will automatically download mdBook from [crates.io], build it, and install it in Cargo's global binary directory (`~/.cargo/bin/` by default).
 
+To uninstall, run the command `cargo uninstall mdbook`.
+
 [Rust installation page]: https://www.rust-lang.org/tools/install
 [crates.io]: https://crates.io/
 
diff --git a/src/book/mod.rs b/src/book/mod.rs
index 3370d92c..9745d2b7 100644
--- a/src/book/mod.rs
+++ b/src/book/mod.rs
@@ -386,7 +386,7 @@ fn determine_renderers(config: &Config) -> Vec<Box<dyn Renderer>> {
     renderers
 }
 
-const DEFAULT_PREPROCESSORS: &[&'static str] = &["links", "index"];
+const DEFAULT_PREPROCESSORS: &[&str] = &["links", "index"];
 
 fn is_default_preprocessor(pre: &dyn Preprocessor) -> bool {
     let name = pre.name();
@@ -756,10 +756,9 @@ mod tests {
 
         let preprocessors = determine_preprocessors(&cfg).unwrap();
 
-        assert!(preprocessors
+        assert!(!preprocessors
             .iter()
-            .find(|preprocessor| preprocessor.name() == "random")
-            .is_none());
+            .any(|preprocessor| preprocessor.name() == "random"));
     }
 
     #[test]
@@ -776,10 +775,9 @@ mod tests {
 
         let preprocessors = determine_preprocessors(&cfg).unwrap();
 
-        assert!(preprocessors
+        assert!(!preprocessors
             .iter()
-            .find(|preprocessor| preprocessor.name() == "links")
-            .is_none());
+            .any(|preprocessor| preprocessor.name() == "links"));
     }
 
     #[test]
diff --git a/src/cmd/init.rs b/src/cmd/init.rs
index 1ee5ff21..c964dcc1 100644
--- a/src/cmd/init.rs
+++ b/src/cmd/init.rs
@@ -122,8 +122,5 @@ fn confirm() -> bool {
     io::stdout().flush().unwrap();
     let mut s = String::new();
     io::stdin().read_line(&mut s).ok();
-    match &*s.trim() {
-        "Y" | "y" | "yes" | "Yes" => true,
-        _ => false,
-    }
+    matches!(&*s.trim(), "Y" | "y" | "yes" | "Yes")
 }
diff --git a/src/config.rs b/src/config.rs
index 951957bd..b7d03d1a 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -227,10 +227,10 @@ impl Config {
         let value = Value::try_from(value)
             .with_context(|| "Unable to represent the item as a JSON Value")?;
 
-        if index.starts_with("book.") {
-            self.book.update_value(&index[5..], value);
-        } else if index.starts_with("build.") {
-            self.build.update_value(&index[6..], value);
+        if let Some(key) = index.strip_prefix("book.") {
+            self.book.update_value(key, value);
+        } else if let Some(key) = index.strip_prefix("build.") {
+            self.build.update_value(key, value);
         } else {
             self.rest.insert(index, value);
         }
@@ -371,15 +371,8 @@ impl Serialize for Config {
 }
 
 fn parse_env(key: &str) -> Option<String> {
-    const PREFIX: &str = "MDBOOK_";
-
-    if key.starts_with(PREFIX) {
-        let key = &key[PREFIX.len()..];
-
-        Some(key.to_lowercase().replace("__", ".").replace("_", "-"))
-    } else {
-        None
-    }
+    key.strip_prefix("MDBOOK_")
+        .map(|key| key.to_lowercase().replace("__", ".").replace('_', "-"))
 }
 
 fn is_legacy_format(table: &Value) -> bool {
@@ -828,7 +821,7 @@ mod tests {
         "#;
 
         let got = Config::from_str(src).unwrap();
-        assert_eq!(got.html_config().unwrap().playground.runnable, false);
+        assert!(!got.html_config().unwrap().playground.runnable);
     }
 
     #[test]
@@ -1037,7 +1030,7 @@ mod tests {
     fn encode_env_var(key: &str) -> String {
         format!(
             "MDBOOK_{}",
-            key.to_uppercase().replace('.', "__").replace("-", "_")
+            key.to_uppercase().replace('.', "__").replace('-', "_")
         )
     }
 
@@ -1061,11 +1054,10 @@ mod tests {
     }
 
     #[test]
-    #[allow(clippy::approx_constant)]
     fn update_config_using_env_var_and_complex_value() {
         let mut cfg = Config::default();
         let key = "foo-bar.baz";
-        let value = json!({"array": [1, 2, 3], "number": 3.14});
+        let value = json!({"array": [1, 2, 3], "number": 13.37});
         let value_str = serde_json::to_string(&value).unwrap();
 
         assert!(cfg.get(key).is_none());
@@ -1184,15 +1176,15 @@ mod tests {
         "#;
         let got = Config::from_str(src).unwrap();
         let html_config = got.html_config().unwrap();
-        assert_eq!(html_config.print.enable, false);
-        assert_eq!(html_config.print.page_break, true);
+        assert!(!html_config.print.enable);
+        assert!(html_config.print.page_break);
         let src = r#"
         [output.html.print]
         page-break = false
         "#;
         let got = Config::from_str(src).unwrap();
         let html_config = got.html_config().unwrap();
-        assert_eq!(html_config.print.enable, true);
-        assert_eq!(html_config.print.page_break, false);
+        assert!(html_config.print.enable);
+        assert!(!html_config.print.page_break);
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 23309fb0..cc62b0ab 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -82,7 +82,6 @@
 
 #![deny(missing_docs)]
 #![deny(rust_2018_idioms)]
-#![allow(clippy::comparison_chain)]
 
 #[macro_use]
 extern crate lazy_static;
diff --git a/src/preprocess/links.rs b/src/preprocess/links.rs
index 4daa3af9..df0eb36f 100644
--- a/src/preprocess/links.rs
+++ b/src/preprocess/links.rs
@@ -153,6 +153,7 @@ enum RangeOrAnchor {
 }
 
 // A range of lines specified with some include directive.
+#[allow(clippy::enum_variant_names)] // The prefix can't be removed, and is meant to mirror the contained type
 #[derive(PartialEq, Debug, Clone)]
 enum LineRange {
     Range(Range<usize>),
diff --git a/src/renderer/html_handlebars/hbs_renderer.rs b/src/renderer/html_handlebars/hbs_renderer.rs
index 8a13db9f..b933a359 100644
--- a/src/renderer/html_handlebars/hbs_renderer.rs
+++ b/src/renderer/html_handlebars/hbs_renderer.rs
@@ -116,7 +116,7 @@ impl HtmlHandlebars {
         if ctx.is_index {
             ctx.data.insert("path".to_owned(), json!("index.md"));
             ctx.data.insert("path_to_root".to_owned(), json!(""));
-            ctx.data.insert("is_index".to_owned(), json!("true"));
+            ctx.data.insert("is_index".to_owned(), json!(true));
             let rendered_index = ctx.handlebars.render("index", &ctx.data)?;
             let rendered_index =
                 self.post_process(rendered_index, &ctx.html_config.playground, ctx.edition);
@@ -540,7 +540,8 @@ impl Renderer for HtmlHandlebars {
                 chapter_titles: &ctx.chapter_titles,
             };
             self.render_item(item, ctx, &mut print_content)?;
-            is_index = false;
+            // Only the first non-draft chapter item should be treated as the "index"
+            is_index &= !matches!(item, BookItem::Chapter(ch) if !ch.is_draft_chapter());
         }
 
         // Render 404 page
@@ -814,7 +815,7 @@ fn fix_code_blocks(html: &str) -> String {
     FIX_CODE_BLOCKS
         .replace_all(html, |caps: &Captures<'_>| {
             let before = &caps[1];
-            let classes = &caps[2].replace(",", " ");
+            let classes = &caps[2].replace(',', " ");
             let after = &caps[3];
 
             format!(
@@ -880,11 +881,8 @@ fn add_playground_pre(
                                 // we need to inject our own main
                                 let (attrs, code) = partition_source(code);
 
-                                format!(
-                                    "\n# #![allow(unused)]\n{}#fn main() {{\n{}#}}",
-                                    attrs, code
-                                )
-                                .into()
+                                format!("# #![allow(unused)]\n{}#fn main() {{\n{}#}}", attrs, code)
+                                    .into()
                             };
                             hide_lines(&content)
                         }
@@ -1007,7 +1005,7 @@ mod tests {
     fn add_playground() {
         let inputs = [
           ("<code class=\"language-rust\">x()</code>",
-           "<pre class=\"playground\"><code class=\"language-rust\">\n<span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
+           "<pre class=\"playground\"><code class=\"language-rust\"><span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
           ("<code class=\"language-rust\">fn main() {}</code>",
            "<pre class=\"playground\"><code class=\"language-rust\">fn main() {}\n</code></pre>"),
           ("<code class=\"language-rust editable\">let s = \"foo\n # bar\n\";</code>",
@@ -1037,7 +1035,7 @@ mod tests {
     fn add_playground_edition2015() {
         let inputs = [
           ("<code class=\"language-rust\">x()</code>",
-           "<pre class=\"playground\"><code class=\"language-rust edition2015\">\n<span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
+           "<pre class=\"playground\"><code class=\"language-rust edition2015\"><span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
           ("<code class=\"language-rust\">fn main() {}</code>",
            "<pre class=\"playground\"><code class=\"language-rust edition2015\">fn main() {}\n</code></pre>"),
           ("<code class=\"language-rust edition2015\">fn main() {}</code>",
@@ -1061,7 +1059,7 @@ mod tests {
     fn add_playground_edition2018() {
         let inputs = [
           ("<code class=\"language-rust\">x()</code>",
-           "<pre class=\"playground\"><code class=\"language-rust edition2018\">\n<span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
+           "<pre class=\"playground\"><code class=\"language-rust edition2018\"><span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
           ("<code class=\"language-rust\">fn main() {}</code>",
            "<pre class=\"playground\"><code class=\"language-rust edition2018\">fn main() {}\n</code></pre>"),
           ("<code class=\"language-rust edition2015\">fn main() {}</code>",
@@ -1085,7 +1083,7 @@ mod tests {
     fn add_playground_edition2021() {
         let inputs = [
             ("<code class=\"language-rust\">x()</code>",
-             "<pre class=\"playground\"><code class=\"language-rust edition2021\">\n<span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
+             "<pre class=\"playground\"><code class=\"language-rust edition2021\"><span class=\"boring\">#![allow(unused)]\n</span><span class=\"boring\">fn main() {\n</span>x()\n<span class=\"boring\">}\n</span></code></pre>"),
             ("<code class=\"language-rust\">fn main() {}</code>",
              "<pre class=\"playground\"><code class=\"language-rust edition2021\">fn main() {}\n</code></pre>"),
             ("<code class=\"language-rust edition2015\">fn main() {}</code>",
diff --git a/src/renderer/html_handlebars/helpers/navigation.rs b/src/renderer/html_handlebars/helpers/navigation.rs
index 83bdadb3..d3f6ca90 100644
--- a/src/renderer/html_handlebars/helpers/navigation.rs
+++ b/src/renderer/html_handlebars/helpers/navigation.rs
@@ -61,7 +61,7 @@ fn find_chapter(
         .as_json()
         .as_str()
         .ok_or_else(|| RenderError::new("Type error for `path`, string expected"))?
-        .replace("\"", "");
+        .replace('\"', "");
 
     if !rc.evaluate(ctx, "@root/is_index")?.is_missing() {
         // Special case for index.md which may be a synthetic page.
@@ -121,7 +121,7 @@ fn render(
         .as_json()
         .as_str()
         .ok_or_else(|| RenderError::new("Type error for `path`, string expected"))?
-        .replace("\"", "");
+        .replace('\"', "");
 
     context.insert(
         "path_to_root".to_owned(),
@@ -141,7 +141,7 @@ fn render(
                 .with_extension("html")
                 .to_str()
                 .ok_or_else(|| RenderError::new("Link could not be converted to str"))
-                .map(|p| context.insert("link".to_owned(), json!(p.replace("\\", "/"))))
+                .map(|p| context.insert("link".to_owned(), json!(p.replace('\\', "/"))))
         })?;
 
     trace!("Render template");
diff --git a/src/renderer/html_handlebars/helpers/toc.rs b/src/renderer/html_handlebars/helpers/toc.rs
index 5869dd36..0884d30a 100644
--- a/src/renderer/html_handlebars/helpers/toc.rs
+++ b/src/renderer/html_handlebars/helpers/toc.rs
@@ -1,5 +1,5 @@
-use std::collections::BTreeMap;
 use std::path::Path;
+use std::{cmp::Ordering, collections::BTreeMap};
 
 use crate::utils;
 use crate::utils::bracket_escape;
@@ -33,7 +33,7 @@ impl HelperDef for RenderToc {
             .as_json()
             .as_str()
             .ok_or_else(|| RenderError::new("Type error for `path`, string expected"))?
-            .replace("\"", "");
+            .replace('\"', "");
 
         let current_section = rc
             .evaluate(ctx, "@root/section")?
@@ -57,6 +57,11 @@ impl HelperDef for RenderToc {
         out.write("<ol class=\"chapter\">")?;
 
         let mut current_level = 1;
+        // The "index" page, which has this attribute set, is supposed to alias the first chapter in
+        // the book, i.e. the first link. There seems to be no easy way to determine which chapter
+        // the "index" is aliasing from within the renderer, so this is used instead to force the
+        // first link to be active. See further below.
+        let mut is_first_chapter = ctx.data().get("is_index").is_some();
 
         for item in chapters {
             // Spacer
@@ -81,22 +86,26 @@ impl HelperDef for RenderToc {
                     level - 1 < fold_level as usize
                 };
 
-            if level > current_level {
-                while level > current_level {
-                    out.write("<li>")?;
-                    out.write("<ol class=\"section\">")?;
-                    current_level += 1;
+            match level.cmp(&current_level) {
+                Ordering::Greater => {
+                    while level > current_level {
+                        out.write("<li>")?;
+                        out.write("<ol class=\"section\">")?;
+                        current_level += 1;
+                    }
+                    write_li_open_tag(out, is_expanded, false)?;
                 }
-                write_li_open_tag(out, is_expanded, false)?;
-            } else if level < current_level {
-                while level < current_level {
-                    out.write("</ol>")?;
-                    out.write("</li>")?;
-                    current_level -= 1;
+                Ordering::Less => {
+                    while level < current_level {
+                        out.write("</ol>")?;
+                        out.write("</li>")?;
+                        current_level -= 1;
+                    }
+                    write_li_open_tag(out, is_expanded, false)?;
+                }
+                Ordering::Equal => {
+                    write_li_open_tag(out, is_expanded, item.get("section").is_none())?;
                 }
-                write_li_open_tag(out, is_expanded, false)?;
-            } else {
-                write_li_open_tag(out, is_expanded, item.get("section").is_none())?;
             }
 
             // Part title
@@ -119,14 +128,15 @@ impl HelperDef for RenderToc {
                     .to_str()
                     .unwrap()
                     // Hack for windows who tends to use `\` as separator instead of `/`
-                    .replace("\\", "/");
+                    .replace('\\', "/");
 
                 // Add link
                 out.write(&utils::fs::path_to_root(&current_path))?;
                 out.write(&tmp)?;
                 out.write("\"")?;
 
-                if path == &current_path {
+                if path == &current_path || is_first_chapter {
+                    is_first_chapter = false;
                     out.write(" class=\"active\"")?;
                 }
 
diff --git a/src/renderer/html_handlebars/search.rs b/src/renderer/html_handlebars/search.rs
index 0a59ffe9..c3b944c9 100644
--- a/src/renderer/html_handlebars/search.rs
+++ b/src/renderer/html_handlebars/search.rs
@@ -2,7 +2,7 @@ use std::borrow::Cow;
 use std::collections::{HashMap, HashSet};
 use std::path::Path;
 
-use elasticlunr::Index;
+use elasticlunr::{Index, IndexBuilder};
 use pulldown_cmark::*;
 
 use crate::book::{Book, BookItem};
@@ -13,9 +13,25 @@ use crate::utils;
 
 use serde::Serialize;
 
+const MAX_WORD_LENGTH_TO_INDEX: usize = 80;
+
+/// Tokenizes in the same way as elasticlunr-rs (for English), but also drops long tokens.
+fn tokenize(text: &str) -> Vec<String> {
+    text.split(|c: char| c.is_whitespace() || c == '-')
+        .filter(|s| !s.is_empty())
+        .map(|s| s.trim().to_lowercase())
+        .filter(|s| s.len() <= MAX_WORD_LENGTH_TO_INDEX)
+        .collect()
+}
+
 /// Creates all files required for search.
 pub fn create_files(search_config: &Search, destination: &Path, book: &Book) -> Result<()> {
-    let mut index = Index::new(&["title", "body", "breadcrumbs"]);
+    let mut index = IndexBuilder::new()
+        .add_field_with_tokenizer("title", Box::new(&tokenize))
+        .add_field_with_tokenizer("body", Box::new(&tokenize))
+        .add_field_with_tokenizer("breadcrumbs", Box::new(&tokenize))
+        .build();
+
     let mut doc_urls = Vec::with_capacity(book.sections.len());
 
     for item in book.iter() {
@@ -211,12 +227,13 @@ fn write_to_json(index: Index, search_config: &Search, doc_urls: Vec<String>) ->
 
     let mut fields = BTreeMap::new();
     let mut opt = SearchOptionsField::default();
-    opt.boost = Some(search_config.boost_title);
-    fields.insert("title".into(), opt);
-    opt.boost = Some(search_config.boost_paragraph);
-    fields.insert("body".into(), opt);
-    opt.boost = Some(search_config.boost_hierarchy);
-    fields.insert("breadcrumbs".into(), opt);
+    let mut insert_boost = |key: &str, boost| {
+        opt.boost = Some(boost);
+        fields.insert(key.into(), opt);
+    };
+    insert_boost("title", search_config.boost_title);
+    insert_boost("body", search_config.boost_paragraph);
+    insert_boost("breadcrumbs", search_config.boost_hierarchy);
 
     let search_options = SearchOptions {
         bool: if search_config.use_boolean_and {
diff --git a/src/theme/ayu-highlight.css b/src/theme/ayu-highlight.css
index 0c45c6f1..32c94322 100644
--- a/src/theme/ayu-highlight.css
+++ b/src/theme/ayu-highlight.css
@@ -8,7 +8,6 @@ Original by Dempfi (https://github.com/dempfi/ayu)
   overflow-x: auto;
   background: #191f26;
   color: #e6e1cf;
-  padding: 0.5em;
 }
 
 .hljs-comment,
diff --git a/src/theme/css/chrome.css b/src/theme/css/chrome.css
index 21c08b93..53a54c85 100644
--- a/src/theme/css/chrome.css
+++ b/src/theme/css/chrome.css
@@ -208,24 +208,63 @@ pre {
 pre > .buttons {
     position: absolute;
     z-index: 100;
-    right: 5px;
-    top: 5px;
+    right: 0px;
+    top: 2px;
+    margin: 0px;
+    padding: 2px 0px;
 
     color: var(--sidebar-fg);
     cursor: pointer;
+    visibility: hidden;
+    opacity: 0;
+    transition: visibility 0.1s linear, opacity 0.1s linear;
+}
+pre:hover > .buttons {
+    visibility: visible;
+    opacity: 1
 }
 pre > .buttons :hover {
     color: var(--sidebar-active);
+    border-color: var(--icons-hover);
+    background-color: var(--theme-hover);
 }
 pre > .buttons i {
     margin-left: 8px;
 }
 pre > .buttons button {
-    color: inherit;
-    background: transparent;
-    border: none;
     cursor: inherit;
+    margin: 0px 5px;
+    padding: 3px 5px;
+    font-size: 14px;
+
+    border-style: solid;
+    border-width: 1px;
+    border-radius: 4px;
+    border-color: var(--icons);
+    background-color: var(--theme-popup-bg);
+    transition: 100ms;
+    transition-property: color,border-color,background-color;
+    color: var(--icons);
 }
+@media (pointer: coarse) {
+    pre > .buttons button {
+        /* On mobile, make it easier to tap buttons. */
+        padding: 0.3rem 1rem;
+    }
+}
+code {
+    padding: 1rem;
+}
+
+/* FIXME: ACE editors overlap their buttons because ACE does absolute
+   positioning within the code block which breaks padding. The only solution I
+   can think of is to move the padding to the outer pre tag (or insert a div
+   wrapper), but that would require fixing a whole bunch of CSS rules.
+*/
+.hljs.ace_editor {
+  padding: 0rem 0rem;
+}
+
 pre > .result {
     margin-top: 10px;
 }
diff --git a/src/theme/css/general.css b/src/theme/css/general.css
index ef2ba504..0e4f07a5 100644
--- a/src/theme/css/general.css
+++ b/src/theme/css/general.css
@@ -26,6 +26,16 @@ code {
     font-size: 0.875em; /* please adjust the ace font size accordingly in editor.js */
 }
 
+/* make long words/inline code not x overflow */
+main {
+    overflow-wrap: break-word;
+}
+
+/* make wide tables scroll if they overflow */
+.table-wrapper {
+    overflow-x: auto;
+}
+
 /* Don't change font size in headers. */
 h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
     font-size: unset;
@@ -80,8 +90,7 @@ h6:target::before {
 
 .content {
     overflow-y: auto;
-    padding: 0 15px;
-    padding-bottom: 50px;
+    padding: 0 5px 50px 5px;
 }
 .content main {
     margin-left: auto;
diff --git a/src/theme/highlight.css b/src/theme/highlight.css
index c2343227..ba57b82b 100644
--- a/src/theme/highlight.css
+++ b/src/theme/highlight.css
@@ -61,7 +61,6 @@
   overflow-x: auto;
   background: #f6f7f6;
   color: #000;
-  padding: 0.5em;
 }
 
 .hljs-emphasis {
diff --git a/src/theme/tomorrow-night.css b/src/theme/tomorrow-night.css
index f7197925..5b4aca77 100644
--- a/src/theme/tomorrow-night.css
+++ b/src/theme/tomorrow-night.css
@@ -81,8 +81,6 @@
   overflow-x: auto;
   background: #1d1f21;
   color: #c5c8c6;
-  padding: 0.5em;
-  -webkit-text-size-adjust: none;
 }
 
 .coffeescript .javascript,
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 2000d661..a205633f 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -200,12 +200,28 @@ pub fn render_markdown_with_path(text: &str, curly_quotes: bool, path: Option<&P
     let p = new_cmark_parser(text, curly_quotes);
     let events = p
         .map(clean_codeblock_headers)
-        .map(|event| adjust_links(event, path));
+        .map(|event| adjust_links(event, path))
+        .flat_map(|event| {
+            let (a, b) = wrap_tables(event);
+            a.into_iter().chain(b)
+        });
 
     html::push_html(&mut s, events);
     s
 }
 
+/// Wraps tables in a `.table-wrapper` class to apply overflow-x rules to.
+fn wrap_tables(event: Event<'_>) -> (Option<Event<'_>>, Option<Event<'_>>) {
+    match event {
+        Event::Start(Tag::Table(_)) => (
+            Some(Event::Html(r#"<div class="table-wrapper">"#.into())),
+            Some(event),
+        ),
+        Event::End(Tag::Table(_)) => (Some(event), Some(Event::Html(r#"</div>"#.into()))),
+        _ => (Some(event), None),
+    }
+}
+
 fn clean_codeblock_headers(event: Event<'_>) -> Event<'_> {
     match event {
         Event::Start(Tag::CodeBlock(CodeBlockKind::Fenced(ref info))) => {
@@ -282,6 +298,22 @@ mod tests {
             );
         }
 
+        #[test]
+        fn it_can_wrap_tables() {
+            let src = r#"
+| Original        | Punycode        | Punycode + Encoding |
+|-----------------|-----------------|---------------------|
+| føø             | f-5gaa          | f_5gaa              |
+"#;
+            let out = r#"
+<div class="table-wrapper"><table><thead><tr><th>Original</th><th>Punycode</th><th>Punycode + Encoding</th></tr></thead><tbody>
+<tr><td>føø</td><td>f-5gaa</td><td>f_5gaa</td></tr>
+</tbody></table>
+</div>
+"#.trim();
+            assert_eq!(render_markdown(src, false), out);
+        }
+
         #[test]
         fn it_can_keep_quotes_straight() {
             assert_eq!(render_markdown("'one'", false), "<p>'one'</p>\n");
diff --git a/src/utils/string.rs b/src/utils/string.rs
index 59931743..97485d7b 100644
--- a/src/utils/string.rs
+++ b/src/utils/string.rs
@@ -122,6 +122,7 @@ mod tests {
     };
 
     #[test]
+    #[allow(clippy::reversed_empty_ranges)] // Intentionally checking that those are correctly handled
     fn take_lines_test() {
         let s = "Lorem\nipsum\ndolor\nsit\namet";
         assert_eq!(take_lines(s, 1..3), "ipsum\ndolor");
@@ -163,6 +164,7 @@ mod tests {
     }
 
     #[test]
+    #[allow(clippy::reversed_empty_ranges)] // Intentionally checking that those are correctly handled
     fn take_rustdoc_include_lines_test() {
         let s = "Lorem\nipsum\ndolor\nsit\namet";
         assert_eq!(
diff --git a/tests/dummy_book/index_html_test/SUMMARY.md b/tests/dummy_book/index_html_test/SUMMARY.md
new file mode 100644
index 00000000..37bf68cd
--- /dev/null
+++ b/tests/dummy_book/index_html_test/SUMMARY.md
@@ -0,0 +1,11 @@
+# Summary
+
+---
+
+- [None of these should be treated as the "index chapter"]()
+
+# Part 1
+
+- [Not this either]()
+- [Chapter 1](./chapter_1.md)
+- [And not this]()
diff --git a/tests/dummy_book/index_html_test/chapter_1.md b/tests/dummy_book/index_html_test/chapter_1.md
new file mode 100644
index 00000000..b743fda3
--- /dev/null
+++ b/tests/dummy_book/index_html_test/chapter_1.md
@@ -0,0 +1 @@
+# Chapter 1
diff --git a/tests/dummy_book/src/first/no-headers.md b/tests/dummy_book/src/first/no-headers.md
index 8f9a6d17..5d799aa6 100644
--- a/tests/dummy_book/src/first/no-headers.md
+++ b/tests/dummy_book/src/first/no-headers.md
@@ -1,3 +1,5 @@
 Capybara capybara capybara.
 
-Capybara capybara capybara.
\ No newline at end of file
+Capybara capybara capybara.
+
+ThisLongWordIsIncludedSoWeCanCheckThatSufficientlyLongWordsAreOmittedFromTheSearchIndex.
diff --git a/tests/rendered_output.rs b/tests/rendered_output.rs
index 873a622d..9750a35e 100644
--- a/tests/rendered_output.rs
+++ b/tests/rendered_output.rs
@@ -467,6 +467,21 @@ fn by_default_mdbook_use_index_preprocessor_to_convert_readme_to_index() {
     assert_doesnt_contain_strings(&second_index, &unexpected_strings);
 }
 
+#[test]
+fn first_chapter_is_copied_as_index_even_if_not_first_elem() {
+    let temp = DummyBook::new().build().unwrap();
+    let mut cfg = Config::default();
+    cfg.set("book.src", "index_html_test")
+        .expect("Couldn't set config.book.src to \"index_html_test\"");
+    let md = MDBook::load_with_config(temp.path(), cfg).unwrap();
+    md.build().unwrap();
+
+    let root = temp.path().join("book");
+    let chapter = fs::read_to_string(root.join("chapter_1.html")).expect("read chapter 1");
+    let index = fs::read_to_string(root.join("index.html")).expect("read index");
+    pretty_assertions::assert_eq!(chapter, index);
+}
+
 #[test]
 fn theme_dir_overrides_work_correctly() {
     let book_dir = dummy_book::new_copy_of_example_book().unwrap();
@@ -772,7 +787,7 @@ mod search {
         );
         assert_eq!(
             docs[&no_headers]["body"],
-            "Capybara capybara capybara. Capybara capybara capybara."
+            "Capybara capybara capybara. Capybara capybara capybara. ThisLongWordIsIncludedSoWeCanCheckThatSufficientlyLongWordsAreOmittedFromTheSearchIndex."
         );
     }
 
diff --git a/tests/searchindex_fixture.json b/tests/searchindex_fixture.json
index cf00ca8d..5b23560e 100644
--- a/tests/searchindex_fixture.json
+++ b/tests/searchindex_fixture.json
@@ -241,7 +241,7 @@
           "title": "Unicode stress tests"
         },
         "19": {
-          "body": "Capybara capybara capybara. Capybara capybara capybara.",
+          "body": "Capybara capybara capybara. Capybara capybara capybara. ThisLongWordIsIncludedSoWeCanCheckThatSufficientlyLongWordsAreOmittedFromTheSearchIndex.",
           "breadcrumbs": "First Chapter » No Headers",
           "id": "19",
           "title": "First Chapter"