diff --git a/src/libcollections/dlist.rs b/src/libcollections/dlist.rs
index 87e07b7b1b66f..d660be584840d 100644
--- a/src/libcollections/dlist.rs
+++ b/src/libcollections/dlist.rs
@@ -132,7 +132,7 @@ fn link_with_prev<T>(mut next: Box<Node<T>>, prev: Rawlink<Node<T>>)
 impl<T> Collection for DList<T> {
     /// Returns `true` if the `DList` is empty.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in $$O(1)$$ time.
     #[inline]
     fn is_empty(&self) -> bool {
         self.list_head.is_none()
@@ -140,7 +140,7 @@ impl<T> Collection for DList<T> {
 
     /// Returns the length of the `DList`.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in $$O(1)$$ time.
     #[inline]
     fn len(&self) -> uint {
         self.length
@@ -248,7 +248,7 @@ impl<T> Deque<T> for DList<T> {
 
     /// Adds an element first in the list.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in $$O(1)$$ time.
     fn push_front(&mut self, elt: T) {
         self.push_front_node(box Node::new(elt))
     }
@@ -256,7 +256,7 @@ impl<T> Deque<T> for DList<T> {
     /// Removes the first element and returns it, or `None` if the list is
     /// empty.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in $$O(1)$$ time.
     fn pop_front(&mut self) -> Option<T> {
         self.pop_front_node().map(|box Node{value, ..}| value)
     }
@@ -339,7 +339,7 @@ impl<T> DList<T> {
 
     /// Adds all elements from `other` to the end of the list.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in $$O(1)$$ time.
     ///
     /// # Example
     ///
@@ -380,7 +380,7 @@ impl<T> DList<T> {
 
     /// Adds all elements from `other` to the beginning of the list.
     ///
-    /// This operation should compute in O(1) time.
+    /// This operation should compute in $$O(1)$$ time.
     ///
     /// # Example
     ///
@@ -409,7 +409,7 @@ impl<T> DList<T> {
     /// Inserts `elt` before the first `x` in the list where `f(x, elt)` is
     /// true, or at the end.
     ///
-    /// This operation should compute in O(N) time.
+    /// This operation should compute in $$O(N)$$ time.
     ///
     /// # Example
     ///
@@ -448,7 +448,7 @@ impl<T> DList<T> {
     /// Iterates both `DList`s with `a` from self and `b` from `other`, and
     /// put `a` in the result if `f(a, b)` is true, and otherwise `b`.
     ///
-    /// This operation should compute in O(max(N, M)) time.
+    /// This operation should compute in $$O(\max(N, M))$$ time.
     pub fn merge(&mut self, mut other: DList<T>, f: |&T, &T| -> bool) {
         {
             let mut it = self.iter_mut();
@@ -512,7 +512,7 @@ impl<T> DList<T> {
 impl<T: Ord> DList<T> {
     /// Inserts `elt` sorted in ascending order.
     ///
-    /// This operation should compute in O(N) time.
+    /// This operation should compute in $$O(N)$$ time.
     #[inline]
     pub fn insert_ordered(&mut self, elt: T) {
         self.insert_when(elt, |a, b| a >= b)
diff --git a/src/libcollections/lib.rs b/src/libcollections/lib.rs
index 8b9a0ec796e27..41c2edbc5b311 100644
--- a/src/libcollections/lib.rs
+++ b/src/libcollections/lib.rs
@@ -17,7 +17,8 @@
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/master/",
-       html_playground_url = "http://play.rust-lang.org/")]
+       html_playground_url = "http://play.rust-lang.org/",
+       enable_math)]
 
 #![feature(macro_rules, managed_boxes, default_type_params, phase, globs)]
 #![feature(unsafe_destructor, import_shadowing)]
diff --git a/src/libcollections/priority_queue.rs b/src/libcollections/priority_queue.rs
index 68e2086d042a3..cd84a8f5f057b 100644
--- a/src/libcollections/priority_queue.rs
+++ b/src/libcollections/priority_queue.rs
@@ -10,10 +10,10 @@
 
 //! A priority queue implemented with a binary heap.
 //!
-//! Insertions have `O(log n)` time complexity and checking or popping the largest element is
-//! `O(1)`. Converting a vector to a priority queue can be done in-place, and has `O(n)`
+//! Insertions have $$O(\log n)$$ time complexity and checking or popping the largest element is
+//! $$O(1)$$ . Converting a vector to a priority queue can be done in-place, and has $$O(n)$$
 //! complexity. A priority queue can also be converted to a sorted vector in-place, allowing it to
-//! be used for an `O(n log n)` in-place heapsort.
+//! be used for an $$O(n \log n)$$ in-place heapsort.
 //!
 //! # Example
 //!
diff --git a/src/libcollections/ringbuf.rs b/src/libcollections/ringbuf.rs
index 02c8af2c470f3..e6bb5a4042bed 100644
--- a/src/libcollections/ringbuf.rs
+++ b/src/libcollections/ringbuf.rs
@@ -8,8 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! This crate implements a double-ended queue with `O(1)` amortized inserts and removals from both
-//! ends of the container. It also has `O(1)` indexing like a vector. The contained elements are
+//! This crate implements a double-ended queue with $$O(1)$$ amortized inserts and removals from both
+//! ends of the container. It also has $$O(1)$$ indexing like a vector. The contained elements are
 //! not required to be copyable, and the queue will be sendable if the contained type is sendable.
 //! Its interface `Deque` is defined in `collections`.
 
diff --git a/src/libcollections/slice.rs b/src/libcollections/slice.rs
index 45489bbf84eb4..8f7b3ffa0cccd 100644
--- a/src/libcollections/slice.rs
+++ b/src/libcollections/slice.rs
@@ -562,7 +562,7 @@ pub trait MutableSliceAllocating<'a, T> {
     /// Sorts the slice, in place, using `compare` to compare
     /// elements.
     ///
-    /// This sort is `O(n log n)` worst-case and stable, but allocates
+    /// This sort is $$O(n \log n)$$ worst-case and stable, but allocates
     /// approximately `2 * n`, where `n` is the length of `self`.
     ///
     /// # Example
diff --git a/src/libcollections/smallintmap.rs b/src/libcollections/smallintmap.rs
index 94dbf84a4b4b9..3f94726fa8ef5 100644
--- a/src/libcollections/smallintmap.rs
+++ b/src/libcollections/smallintmap.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 //! A simple map based on a vector for small integer keys. Space requirements
-//! are O(highest integer key).
+//! are $$O(\text{highest integer key})$$.
 
 #![allow(missing_doc)]
 
diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs
index 6843996a9e145..119e216855ed7 100644
--- a/src/libcollections/string.rs
+++ b/src/libcollections/string.rs
@@ -746,7 +746,7 @@ impl String {
     ///
     /// # Warning
     ///
-    /// This is a O(n) operation as it requires copying every element in the
+    /// This is a $$O(n)$$ operation as it requires copying every element in the
     /// buffer.
     ///
     /// # Failure
diff --git a/src/libcollections/vec.rs b/src/libcollections/vec.rs
index 479a4c3045a6a..6b3918df03138 100644
--- a/src/libcollections/vec.rs
+++ b/src/libcollections/vec.rs
@@ -10,7 +10,7 @@
 
 //! A growable list type, written `Vec<T>` but pronounced 'vector.'
 //!
-//! Vectors have `O(1)` indexing, push (to the end) and pop (from the end).
+//! Vectors have $$O(1)$$ indexing, push (to the end) and pop (from the end).
 
 use core::prelude::*;
 
@@ -897,8 +897,8 @@ impl<T> Vec<T> {
 
     /// Sorts the vector, in place, using `compare` to compare elements.
     ///
-    /// This sort is `O(n log n)` worst-case and stable, but allocates
-    /// approximately `2 * n`, where `n` is the length of `self`.
+    /// This sort is $$O(n \log n)$$ worst-case and stable, but allocates
+    /// approximately `2 * n` elements, where `n` is the length of `self`.
     ///
     /// # Example
     ///
@@ -1006,7 +1006,7 @@ impl<T> Vec<T> {
     }
 
     /// Removes an element from anywhere in the vector and return it, replacing
-    /// it with the last element. This does not preserve ordering, but is O(1).
+    /// it with the last element. This does not preserve ordering, but is $$O(1)$$ .
     ///
     /// Returns `None` if `index` is out of bounds.
     ///
@@ -1039,7 +1039,7 @@ impl<T> Vec<T> {
     ///
     /// # Warning
     ///
-    /// This is an O(n) operation as it requires copying every element in the
+    /// This is an $$O(n)$$ operation as it requires copying every element in the
     /// vector.
     ///
     /// # Example
@@ -1060,7 +1060,7 @@ impl<T> Vec<T> {
     ///
     /// # Warning
     ///
-    /// This is an O(n) operation as it requires copying every element in the
+    /// This is an $$O(n)$$ operation as it requires copying every element in the
     /// vector.
     ///
     /// # Example
@@ -1464,7 +1464,7 @@ impl<T> Vec<T> {
 impl<T:Ord> Vec<T> {
     /// Sorts the vector in place.
     ///
-    /// This sort is `O(n log n)` worst-case and stable, but allocates
+    /// This sort is $$O(n \log n)$$ worst-case and stable, but allocates
     /// approximately `2 * n`, where `n` is the length of `self`.
     ///
     /// # Example
diff --git a/src/librand/distributions/exponential.rs b/src/librand/distributions/exponential.rs
index 7d1a4409718fa..19067adae62ef 100644
--- a/src/librand/distributions/exponential.rs
+++ b/src/librand/distributions/exponential.rs
@@ -17,9 +17,7 @@ use distributions::{ziggurat, ziggurat_tables, Sample, IndependentSample};
 
 /// A wrapper around an `f64` to generate Exp(1) random numbers.
 ///
-/// See `Exp` for the general exponential distribution.Note that this
- // has to be unwrapped before use as an `f64` (using either
-/// `*` or `mem::transmute` is safe).
+/// See `Exp` for the general exponential distribution.
 ///
 /// Implemented via the ZIGNOR variant[1] of the Ziggurat method. The
 /// exact description in the paper was adjusted to use tables for the
@@ -53,8 +51,8 @@ impl Rand for Exp1 {
 
 /// The exponential distribution `Exp(lambda)`.
 ///
-/// This distribution has density function: `f(x) = lambda *
-/// exp(-lambda * x)` for `x > 0`.
+/// This distribution has density function: $$f(x) = \lambda
+/// e^{-\lambda x}$$ for $$x > 0$$ .
 ///
 /// # Example
 ///
diff --git a/src/librand/distributions/gamma.rs b/src/librand/distributions/gamma.rs
index 7b6e94eaa9209..f873e0e9aeab1 100644
--- a/src/librand/distributions/gamma.rs
+++ b/src/librand/distributions/gamma.rs
@@ -22,12 +22,11 @@ use super::{IndependentSample, Sample, Exp};
 ///
 /// The density function of this distribution is
 ///
-/// ```text
-/// f(x) =  x^(k - 1) * exp(-x / θ) / (Γ(k) * θ^k)
-/// ```
+/// $$f(x) =  x^{k - 1} \frac{\exp(-x / \theta)}{\Gamma(k) \theta^k}$$
 ///
-/// where `Γ` is the Gamma function, `k` is the shape and `θ` is the
-/// scale and both `k` and `θ` are strictly positive.
+/// where $$\Gamma$$ is the Gamma function, $$k$$ is the shape and
+/// $$\theta$$ is the scale and both $$k$$ and $$\theta$$ are strictly
+/// positive.
 ///
 /// The algorithm used is that described by Marsaglia & Tsang 2000[1],
 /// falling back to directly sampling from an Exponential for `shape
diff --git a/src/librand/lib.rs b/src/librand/lib.rs
index f8a775478f1f8..382fd77af0662 100644
--- a/src/librand/lib.rs
+++ b/src/librand/lib.rs
@@ -22,7 +22,8 @@
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk.png",
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/master/",
-       html_playground_url = "http://play.rust-lang.org/")]
+       html_playground_url = "http://play.rust-lang.org/",
+       enable_math)]
 
 #![feature(macro_rules, phase, globs)]
 #![no_std]
diff --git a/src/librustdoc/html/layout.rs b/src/librustdoc/html/layout.rs
index 896d070c155ee..355e4e576e6d2 100644
--- a/src/librustdoc/html/layout.rs
+++ b/src/librustdoc/html/layout.rs
@@ -12,6 +12,7 @@ use std::fmt;
 use std::io;
 
 use externalfiles::ExternalHtml;
+use html::markdown;
 
 #[deriving(Clone)]
 pub struct Layout {
@@ -20,6 +21,7 @@ pub struct Layout {
     pub external_html: ExternalHtml,
     pub krate: String,
     pub playground_url: String,
+    pub enable_math: bool,
 }
 
 pub struct Page<'a> {
@@ -34,7 +36,11 @@ pub fn render<T: fmt::Show, S: fmt::Show>(
     dst: &mut io::Writer, layout: &Layout, page: &Page, sidebar: &S, t: &T)
     -> io::IoResult<()>
 {
-    write!(dst,
+    // Reset state on whether we've seen math, so as to avoid loading mathjax
+    // on pages that don't actually *have* math.
+    markdown::math_seen.replace(Some(false));
+
+    try!(write!(dst,
 r##"<!DOCTYPE html>
 <html lang="en">
 <head>
@@ -47,6 +53,7 @@ r##"<!DOCTYPE html>
     <title>{title}</title>
 
     <link rel="stylesheet" type="text/css" href="{root_path}main.css">
+    {katex_css}
 
     {favicon}
     {in_header}
@@ -119,13 +126,13 @@ r##"<!DOCTYPE html>
         window.rootPath = "{root_path}";
         window.currentCrate = "{krate}";
         window.playgroundUrl = "{play_url}";
+        window.useKaTeX = true;
     </script>
     <script src="{root_path}jquery.js"></script>
     <script src="{root_path}main.js"></script>
     {play_js}
     <script async src="{root_path}search-index.js"></script>
-</body>
-</html>"##,
+"##,
     content   = *t,
     root_path = page.root_path,
     ty        = page.ty,
@@ -156,7 +163,27 @@ r##"<!DOCTYPE html>
     } else {
         format!(r#"<script src="{}playpen.js"></script>"#, page.root_path)
     },
-    )
+    katex_css = if layout.enable_math {
+        // this is inserted even for pages for which there is no
+        // actual mathematics (unlike the JS), but this CSS is quite
+        // small, and it's harder to insert this conditionally, since
+        // that would require rendering the whole thing into memory
+        // and then printing this, and only then print the
+        // markdown.
+        format!(r#"<link rel="stylesheet" type="text/css" href="{}katex/katex.min.css">"#,
+                page.root_path)
+    } else {
+        "".to_string()
+    },
+    ));
+
+    // This must be done after everything is rendered, so that
+    // `math_seen` captures all possible $$'s on this page.
+    if layout.enable_math && markdown::math_seen.get().map_or(false, |x| *x) {
+        try!(write!(dst, "<script src=\"{}katex/katex.min.js\"></script>", page.root_path));
+    }
+
+    dst.write_str("</body>\n</html>")
 }
 
 pub fn redirect(dst: &mut io::Writer, url: &str) -> io::IoResult<()> {
diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 86f56660d3a64..71dd1143e973e 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -49,13 +49,14 @@ pub struct Markdown<'a>(pub &'a str);
 pub struct MarkdownWithToc<'a>(pub &'a str);
 
 static DEF_OUNIT: libc::size_t = 64;
-static HOEDOWN_EXT_NO_INTRA_EMPHASIS: libc::c_uint = 1 << 10;
+static HOEDOWN_EXT_NO_INTRA_EMPHASIS: libc::c_uint = 1 << 11;
 static HOEDOWN_EXT_TABLES: libc::c_uint = 1 << 0;
 static HOEDOWN_EXT_FENCED_CODE: libc::c_uint = 1 << 1;
 static HOEDOWN_EXT_AUTOLINK: libc::c_uint = 1 << 3;
 static HOEDOWN_EXT_STRIKETHROUGH: libc::c_uint = 1 << 4;
 static HOEDOWN_EXT_SUPERSCRIPT: libc::c_uint = 1 << 8;
 static HOEDOWN_EXT_FOOTNOTES: libc::c_uint = 1 << 2;
+static HOEDOWN_EXT_MATH: libc::c_uint = 1 << 9;
 
 static HOEDOWN_EXTENSIONS: libc::c_uint =
     HOEDOWN_EXT_NO_INTRA_EMPHASIS | HOEDOWN_EXT_TABLES |
@@ -64,6 +65,9 @@ static HOEDOWN_EXTENSIONS: libc::c_uint =
     HOEDOWN_EXT_FOOTNOTES;
 
 type hoedown_document = libc::c_void;  // this is opaque to us
+type hoedown_realloc_callback = extern "C" fn(*mut libc::c_void, libc::size_t)
+    -> *mut libc::size_t;
+type hoedown_free_callback = extern "C" fn(*mut libc::c_void);
 
 #[repr(C)]
 struct hoedown_renderer {
@@ -76,7 +80,10 @@ struct hoedown_renderer {
                                     *mut libc::c_void)>,
     header: Option<extern "C" fn(*mut hoedown_buffer, *const hoedown_buffer,
                                  libc::c_int, *mut libc::c_void)>,
-    other: [libc::size_t, ..28],
+    other1: [libc::size_t, ..24],
+    math: Option<extern "C" fn(*mut hoedown_buffer, *const hoedown_buffer,
+                                 libc::c_int, *mut libc::c_void) -> libc::c_int>,
+    other2: [libc::size_t, ..4],
 }
 
 #[repr(C)]
@@ -101,6 +108,7 @@ struct MyOpaque {
     dfltblk: extern "C" fn(*mut hoedown_buffer, *const hoedown_buffer,
                            *const hoedown_buffer, *mut libc::c_void),
     toc_builder: Option<TocBuilder>,
+    math_seen: bool,
 }
 
 #[repr(C)]
@@ -109,6 +117,9 @@ struct hoedown_buffer {
     size: libc::size_t,
     asize: libc::size_t,
     unit: libc::size_t,
+    data_realloc: Option<hoedown_realloc_callback>,
+    data_free: Option<hoedown_free_callback>,
+    buffer_free: Option<hoedown_free_callback>,
 }
 
 // hoedown FFI
@@ -130,8 +141,13 @@ extern {
 
     fn hoedown_buffer_new(unit: libc::size_t) -> *mut hoedown_buffer;
     fn hoedown_buffer_puts(b: *mut hoedown_buffer, c: *const libc::c_char);
-    fn hoedown_buffer_free(b: *mut hoedown_buffer);
+    fn hoedown_buffer_put(b: *mut hoedown_buffer, data: *const libc::c_void, len: libc::size_t);
 
+    fn hoedown_buffer_free(b: *mut hoedown_buffer);
+    fn hoedown_escape_html(ob: *mut hoedown_buffer,
+                           src: *const libc::uint8_t,
+                           size: libc::size_t,
+                           secure: libc::c_int);
 }
 
 /// Returns Some(code) if `s` is a line that should be stripped from
@@ -147,10 +163,22 @@ fn stripped_filtered_line<'a>(s: &'a str) -> Option<&'a str> {
     }
 }
 
+fn hoedown_extensions() -> libc::c_uint {
+    let mut extensions = HOEDOWN_EXTENSIONS;
+
+    if enable_math.get().map_or(false, |x| *x) {
+        extensions |= HOEDOWN_EXT_MATH;
+    }
+
+    extensions
+}
+
 local_data_key!(used_header_map: RefCell<HashMap<String, uint>>)
 local_data_key!(test_idx: Cell<uint>)
 // None == render an example, but there's no crate name
 local_data_key!(pub playground_krate: Option<String>)
+local_data_key!(pub enable_math: bool)
+local_data_key!(pub math_seen: bool)
 
 pub fn render(w: &mut fmt::Formatter, s: &str, print_toc: bool) -> fmt::Result {
     extern fn block(ob: *mut hoedown_buffer, orig_text: *const hoedown_buffer,
@@ -268,18 +296,46 @@ pub fn render(w: &mut fmt::Formatter, s: &str, print_toc: bool) -> fmt::Result {
         text.with_c_str(|p| unsafe { hoedown_buffer_puts(ob, p) });
     }
 
+    extern fn math(ob: *mut hoedown_buffer, text: *const hoedown_buffer,
+                   display_mode: libc::c_int, opaque: *mut libc::c_void) -> libc::c_int {
+        let opaque = opaque as *mut hoedown_html_renderer_state;
+        let opaque = unsafe { &mut *((*opaque).opaque as *mut MyOpaque) };
+
+        opaque.math_seen = true;
+
+        let (open, close) = if display_mode == 1 {
+            ("<p class=\"latex-math math-display\">", "</p>")
+        } else {
+            ("<span class=\"latex-math math-text\">", "</span>")
+        };
+
+        open.with_c_str(|o| {
+            close.with_c_str(|c| {
+                unsafe {
+                    hoedown_buffer_put(ob, o as *const libc::c_void, open.len() as libc::size_t);
+                    hoedown_escape_html(ob, (*text).data, (*text).size, 0);
+                    hoedown_buffer_put(ob, c as *const libc::c_void, close.len() as libc::size_t);
+                }
+            })
+        });
+
+        1
+    }
+
     unsafe {
         let ob = hoedown_buffer_new(DEF_OUNIT);
         let renderer = hoedown_html_renderer_new(0, 0);
         let mut opaque = MyOpaque {
             dfltblk: (*renderer).blockcode.unwrap(),
-            toc_builder: if print_toc {Some(TocBuilder::new())} else {None}
+            toc_builder: if print_toc {Some(TocBuilder::new())} else {None},
+            math_seen: false,
         };
         (*(*renderer).opaque).opaque = &mut opaque as *mut _ as *mut libc::c_void;
         (*renderer).blockcode = Some(block);
         (*renderer).header = Some(header);
+        (*renderer).math = Some(math);
 
-        let document = hoedown_document_new(renderer, HOEDOWN_EXTENSIONS, 16);
+        let document = hoedown_document_new(renderer, hoedown_extensions(), 16);
         hoedown_document_render(document, ob, s.as_ptr(),
                                 s.len() as libc::size_t);
         hoedown_document_free(document);
@@ -297,6 +353,10 @@ pub fn render(w: &mut fmt::Formatter, s: &str, print_toc: bool) -> fmt::Result {
             });
         }
         hoedown_buffer_free(ob);
+
+        let old = math_seen.get().map_or(false, |x| *x);
+        math_seen.replace(Some(old || opaque.math_seen));
+
         ret
     }
 }
@@ -357,7 +417,7 @@ pub fn find_testable_code(doc: &str, tests: &mut ::test::Collector) {
         (*renderer).header = Some(header);
         (*(*renderer).opaque).opaque = tests as *mut _ as *mut libc::c_void;
 
-        let document = hoedown_document_new(renderer, HOEDOWN_EXTENSIONS, 16);
+        let document = hoedown_document_new(renderer, hoedown_extensions(), 16);
         hoedown_document_render(document, ob, doc.as_ptr(),
                                 doc.len() as libc::size_t);
         hoedown_document_free(document);
diff --git a/src/librustdoc/html/render.rs b/src/librustdoc/html/render.rs
index 3cd3fe3053a37..11a3c86a224c6 100644
--- a/src/librustdoc/html/render.rs
+++ b/src/librustdoc/html/render.rs
@@ -247,6 +247,7 @@ pub fn run(mut krate: clean::Crate, external_html: &ExternalHtml, dst: Path) ->
             external_html: external_html.clone(),
             krate: krate.name.clone(),
             playground_url: "".to_string(),
+            enable_math: false,
         },
         include_sources: true,
         render_redirect_pages: false,
@@ -286,6 +287,13 @@ pub fn run(mut krate: clean::Crate, external_html: &ExternalHtml, dst: Path) ->
                             if "html_no_source" == x.as_slice() => {
                         cx.include_sources = false;
                     }
+                    clean::Word(ref x)
+                            if "enable_math" == x.as_slice() => {
+                        // Possible extension: allow specifying
+                        // alternate engines etc.
+                        cx.layout.enable_math = true;
+                        markdown::enable_math.replace(Some(true));
+                    }
                     _ => {}
                 }
             }
@@ -479,27 +487,70 @@ fn write_shared(cx: &Context,
 
     // Add all the static files. These may already exist, but we just
     // overwrite them anyway to make sure that they're fresh and up-to-date.
-    try!(write(cx.dst.join("jquery.js"),
-               include_bin!("static/jquery-2.1.0.min.js")));
-    try!(write(cx.dst.join("main.js"), include_bin!("static/main.js")));
-    try!(write(cx.dst.join("playpen.js"), include_bin!("static/playpen.js")));
-    try!(write(cx.dst.join("main.css"), include_bin!("static/main.css")));
-    try!(write(cx.dst.join("normalize.css"),
-               include_bin!("static/normalize.css")));
-    try!(write(cx.dst.join("FiraSans-Regular.woff"),
-               include_bin!("static/FiraSans-Regular.woff")));
-    try!(write(cx.dst.join("FiraSans-Medium.woff"),
-               include_bin!("static/FiraSans-Medium.woff")));
-    try!(write(cx.dst.join("Heuristica-Italic.woff"),
-               include_bin!("static/Heuristica-Italic.woff")));
-    try!(write(cx.dst.join("SourceSerifPro-Regular.woff"),
-               include_bin!("static/SourceSerifPro-Regular.woff")));
-    try!(write(cx.dst.join("SourceSerifPro-Bold.woff"),
-               include_bin!("static/SourceSerifPro-Bold.woff")));
-    try!(write(cx.dst.join("SourceCodePro-Regular.woff"),
-               include_bin!("static/SourceCodePro-Regular.woff")));
-    try!(write(cx.dst.join("SourceCodePro-Semibold.woff"),
-               include_bin!("static/SourceCodePro-Semibold.woff")));
+    macro_rules! write_files {
+        ( $($input: tt => $output: tt,)* ) => {{
+            $(
+                try!(write(cx.dst.join($output),
+                           include_bin!($input)));
+                )*
+        }}
+    }
+
+    try!(fs::mkdir_recursive(&cx.dst.join("katex/fonts"), io::UserRWX));
+
+    write_files! {
+        "static/jquery-2.1.0.min.js" => "jquery.js",
+        "static/main.js" => "main.js",
+        "static/playpen.js" => "playpen.js",
+
+        "static/main.css" => "main.css",
+        "static/normalize.css" => "normalize.css",
+
+        "static/FiraSans-Regular.woff" => "FiraSans-Regular.woff",
+        "static/FiraSans-Medium.woff" => "FiraSans-Medium.woff",
+        "static/Heuristica-Italic.woff" => "Heuristica-Italic.woff",
+        "static/SourceSerifPro-Regular.woff" => "SourceSerifPro-Regular.woff",
+        "static/SourceSerifPro-Bold.woff" => "SourceSerifPro-Bold.woff",
+        "static/SourceCodePro-Regular.woff" => "SourceCodePro-Regular.woff",
+        "static/SourceCodePro-Semibold.woff" => "SourceCodePro-Semibold.woff",
+
+        "static/katex/katex.min.css" => "katex/katex.min.css",
+        "static/katex/katex.min.js" => "katex/katex.min.js",
+        "static/katex/fonts/KaTeX_AMS-Regular.eot" => "katex/fonts/KaTeX_AMS-Regular.eot",
+        "static/katex/fonts/KaTeX_AMS-Regular.ttf" => "katex/fonts/KaTeX_AMS-Regular.ttf",
+        "static/katex/fonts/KaTeX_AMS-Regular.woff" => "katex/fonts/KaTeX_AMS-Regular.woff",
+        "static/katex/fonts/KaTeX_Main-Bold.eot" => "katex/fonts/KaTeX_Main-Bold.eot",
+        "static/katex/fonts/KaTeX_Main-Bold.ttf" => "katex/fonts/KaTeX_Main-Bold.ttf",
+        "static/katex/fonts/KaTeX_Main-Bold.woff" => "katex/fonts/KaTeX_Main-Bold.woff",
+        "static/katex/fonts/KaTeX_Main-Italic.eot" => "katex/fonts/KaTeX_Main-Italic.eot",
+        "static/katex/fonts/KaTeX_Main-Italic.ttf" => "katex/fonts/KaTeX_Main-Italic.ttf",
+        "static/katex/fonts/KaTeX_Main-Italic.woff" => "katex/fonts/KaTeX_Main-Italic.woff",
+        "static/katex/fonts/KaTeX_Main-Regular.eot" => "katex/fonts/KaTeX_Main-Regular.eot",
+        "static/katex/fonts/KaTeX_Main-Regular.ttf" => "katex/fonts/KaTeX_Main-Regular.ttf",
+        "static/katex/fonts/KaTeX_Main-Regular.woff" => "katex/fonts/KaTeX_Main-Regular.woff",
+        "static/katex/fonts/KaTeX_Math-BoldItalic.eot" => "katex/fonts/KaTeX_Math-BoldItalic.eot",
+        "static/katex/fonts/KaTeX_Math-BoldItalic.ttf" => "katex/fonts/KaTeX_Math-BoldItalic.ttf",
+        "static/katex/fonts/KaTeX_Math-BoldItalic.woff" => "katex/fonts/KaTeX_Math-BoldItalic.woff",
+        "static/katex/fonts/KaTeX_Math-Italic.eot" => "katex/fonts/KaTeX_Math-Italic.eot",
+        "static/katex/fonts/KaTeX_Math-Italic.ttf" => "katex/fonts/KaTeX_Math-Italic.ttf",
+        "static/katex/fonts/KaTeX_Math-Italic.woff" => "katex/fonts/KaTeX_Math-Italic.woff",
+        "static/katex/fonts/KaTeX_Math-Regular.eot" => "katex/fonts/KaTeX_Math-Regular.eot",
+        "static/katex/fonts/KaTeX_Math-Regular.ttf" => "katex/fonts/KaTeX_Math-Regular.ttf",
+        "static/katex/fonts/KaTeX_Math-Regular.woff" => "katex/fonts/KaTeX_Math-Regular.woff",
+        "static/katex/fonts/KaTeX_Size1-Regular.eot" => "katex/fonts/KaTeX_Size1-Regular.eot",
+        "static/katex/fonts/KaTeX_Size1-Regular.ttf" => "katex/fonts/KaTeX_Size1-Regular.ttf",
+        "static/katex/fonts/KaTeX_Size1-Regular.woff" => "katex/fonts/KaTeX_Size1-Regular.woff",
+        "static/katex/fonts/KaTeX_Size2-Regular.eot" => "katex/fonts/KaTeX_Size2-Regular.eot",
+        "static/katex/fonts/KaTeX_Size2-Regular.ttf" => "katex/fonts/KaTeX_Size2-Regular.ttf",
+        "static/katex/fonts/KaTeX_Size2-Regular.woff" => "katex/fonts/KaTeX_Size2-Regular.woff",
+        "static/katex/fonts/KaTeX_Size3-Regular.eot" => "katex/fonts/KaTeX_Size3-Regular.eot",
+        "static/katex/fonts/KaTeX_Size3-Regular.ttf" => "katex/fonts/KaTeX_Size3-Regular.ttf",
+        "static/katex/fonts/KaTeX_Size3-Regular.woff" => "katex/fonts/KaTeX_Size3-Regular.woff",
+        "static/katex/fonts/KaTeX_Size4-Regular.eot" => "katex/fonts/KaTeX_Size4-Regular.eot",
+        "static/katex/fonts/KaTeX_Size4-Regular.ttf" => "katex/fonts/KaTeX_Size4-Regular.ttf",
+        "static/katex/fonts/KaTeX_Size4-Regular.woff" => "katex/fonts/KaTeX_Size4-Regular.woff",
+    }
+
 
     fn collect(path: &Path, krate: &str,
                key: &str) -> io::IoResult<Vec<String>> {
diff --git a/src/librustdoc/html/static/katex/README.md b/src/librustdoc/html/static/katex/README.md
new file mode 100644
index 0000000000000..c2277c0ab8cc3
--- /dev/null
+++ b/src/librustdoc/html/static/katex/README.md
@@ -0,0 +1,42 @@
+# [<img src="https://khan.github.io/KaTeX/katex-logo.svg" width="130" alt="KaTeX">](http://khan.github.io/KaTeX/) [![Build Status](https://travis-ci.org/Khan/KaTeX.svg?branch=master)](https://travis-ci.org/Khan/KaTeX)
+
+KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web.
+
+ * **Fast:** KaTeX renders its math synchronously and doesn't need to reflow the page. See how it compares to a competitor in [this speed test](http://jsperf.com/katex-vs-mathjax/).
+ * **Print quality:** KaTeX’s layout is based on Donald Knuth’s TeX, the gold standard for math typesetting.
+ * **Self contained:** KaTeX has no dependencies and can easily be bundled with your website resources.
+ * **Server side rendering:** KaTeX produces the same output regardless of browser or environment, so you can pre-render expressions using Node.js and send them as plain HTML.
+
+KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, and IE 8 - IE 11.
+
+## Usage
+
+Download the built files from [the releases page](https://github.com/khan/katex/releases). Include the `katex.min.js` and `katex.min.css` files on your page:
+
+```html
+<link rel="stylesheet" type="text/css" href="/path/to/katex.min.css">
+<script src="/path/to/katex.min.js" type="text/javascript"></script>
+```
+
+Call `katex.render` with a TeX expression and a DOM element to render into:
+
+```js
+katex.render("c = \\pm\\sqrt{a^2 + b^2}", element);
+```
+
+To generate HTML on the server, you can use `katex.renderToString`:
+
+```js
+var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}");
+// '<span class="katex">...</span>'
+```
+
+Make sure to include the CSS and font files, but there is no need to include the JavaScript.
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## License
+
+KaTeX is licenced under the [MIT License](http://opensource.org/licenses/MIT).
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diff --git a/src/librustdoc/html/static/katex/katex.min.css b/src/librustdoc/html/static/katex/katex.min.css
new file mode 100644
index 0000000000000..b4ea0e9a83fd6
--- /dev/null
+++ b/src/librustdoc/html/static/katex/katex.min.css
@@ -0,0 +1 @@
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format('truetype');font-weight:400;font-style:italic}@font-face{font-family:KaTeX_Math;src:url(fonts/KaTeX_Math-Regular.eot);src:url(fonts/KaTeX_Math-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Math-Regular.woff) format('woff'),url(fonts/KaTeX_Math-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_SansSerif;src:url(fonts/KaTeX_SansSerif-Bold.eot);src:url(fonts/KaTeX_SansSerif-Bold.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_SansSerif-Bold.woff) format('woff'),url(fonts/KaTeX_SansSerif-Bold.ttf) format('truetype');font-weight:700;font-style:normal}@font-face{font-family:KaTeX_SansSerif;src:url(fonts/KaTeX_SansSerif-Italic.eot);src:url(fonts/KaTeX_SansSerif-Italic.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_SansSerif-Italic.woff) format('woff'),url(fonts/KaTeX_SansSerif-Italic.ttf) format('truetype');font-weight:400;font-style:italic}@font-face{font-family:KaTeX_SansSerif;src:url(fonts/KaTeX_SansSerif-Regular.eot);src:url(fonts/KaTeX_SansSerif-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_SansSerif-Regular.woff) format('woff'),url(fonts/KaTeX_SansSerif-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Script;src:url(fonts/KaTeX_Script-Regular.eot);src:url(fonts/KaTeX_Script-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Script-Regular.woff) format('woff'),url(fonts/KaTeX_Script-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Size1;src:url(fonts/KaTeX_Size1-Regular.eot);src:url(fonts/KaTeX_Size1-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Size1-Regular.woff) format('woff'),url(fonts/KaTeX_Size1-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Size2;src:url(fonts/KaTeX_Size2-Regular.eot);src:url(fonts/KaTeX_Size2-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Size2-Regular.woff) format('woff'),url(fonts/KaTeX_Size2-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Size3;src:url(fonts/KaTeX_Size3-Regular.eot);src:url(fonts/KaTeX_Size3-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Size3-Regular.woff) format('woff'),url(fonts/KaTeX_Size3-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Size4;src:url(fonts/KaTeX_Size4-Regular.eot);src:url(fonts/KaTeX_Size4-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Size4-Regular.woff) format('woff'),url(fonts/KaTeX_Size4-Regular.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:KaTeX_Typewriter;src:url(fonts/KaTeX_Typewriter-Regular.eot);src:url(fonts/KaTeX_Typewriter-Regular.eot?#iefix) format('embedded-opentype'),url(fonts/KaTeX_Typewriter-Regular.woff) format('woff'),url(fonts/KaTeX_Typewriter-Regular.ttf) format('truetype');font-weight:400;font-style:normal}
\ No newline at end of file
diff --git a/src/librustdoc/html/static/katex/katex.min.js b/src/librustdoc/html/static/katex/katex.min.js
new file mode 100644
index 0000000000000..f98113611d12c
--- /dev/null
+++ b/src/librustdoc/html/static/katex/katex.min.js
@@ -0,0 +1,3 @@
+(function(e){if("function"==typeof bootstrap)bootstrap("katex",e);else if("object"==typeof exports)module.exports=e();else if("function"==typeof define&&define.amd)define(e);else if("undefined"!=typeof ses){if(!ses.ok())return;ses.makeKatex=e}else"undefined"!=typeof window?window.katex=e():global.katex=e()})(function(){var e,t,i,h,a;return function l(e,t,i){function h(s,p){if(!t[s]){if(!e[s]){var r=typeof require=="function"&&require;if(!p&&r)return r(s,!0);if(a)return a(s,!0);throw new Error("Cannot find module '"+s+"'")}var c=t[s]={exports:{}};e[s][0].call(c.exports,function(t){var i=e[s][1][t];return h(i?i:t)},c,c.exports,l,e,t,i)}return t[s].exports}var a=typeof require=="function"&&require;for(var s=0;s<i.length;s++)h(i[s]);return h}({1:[function(e,t,i){var h=e("./src/ParseError");var a=e("./src/buildTree");var l=e("./src/parseTree");var s=e("./src/utils");var p=function(e,t){s.clearNode(t);var i=l(e);var h=a(i).toNode();t.appendChild(h)};var r=function(e){var t=l(e);return a(t).toMarkup()};t.exports={render:p,renderToString:r,ParseError:h}},{"./src/ParseError":4,"./src/buildTree":8,"./src/parseTree":13,"./src/utils":15}],2:[function(e,t,i){var h=e("./ParseError");function a(e){this._input=e}function l(e,t,i){this.type=e;this.text=t;this.position=i}var s=[[/^[/|@."`0-9]/,"textord"],[/^[a-zA-Z]/,"mathord"],[/^[*+-]/,"bin"],[/^[=<>:]/,"rel"],[/^[,;]/,"punct"],[/^'/,"'"],[/^\^/,"^"],[/^_/,"_"],[/^{/,"{"],[/^}/,"}"],[/^[(\[]/,"open"],[/^[)\]?!]/,"close"],[/^~/,"spacing"]];var p=[[/^[a-zA-Z0-9`!@*()-=+\[\]'";:?\/.,]/,"textord"],[/^{/,"{"],[/^}/,"}"],[/^~/,"spacing"]];var r=/^\s*/;var c=/^( +|\\  +)/;var g=/^\\(?:[a-zA-Z]+|.)/;a.prototype._innerLex=function(e,t,i){var a=this._input.slice(e);if(i){var s=a.match(r)[0];e+=s.length;a=a.slice(s.length)}else{var s=a.match(c);if(s!==null){return new l(" "," ",e+s[0].length)}}if(a.length===0){return new l("EOF",null,e)}var p;if(p=a.match(g)){return new l(p[0],p[0],e+p[0].length)}else{for(var d=0;d<t.length;d++){var n=t[d];if(p=a.match(n[0])){return new l(n[1],p[0],e+p[0].length)}}}throw new h("Unexpected character: '"+a[0]+"'",this,e)};var d=/^(#[a-z0-9]+|[a-z]+)/i;a.prototype._innerLexColor=function(e){var t=this._input.slice(e);var i=t.match(r)[0];e+=i.length;t=t.slice(i.length);var a;if(a=t.match(d)){return new l("color",a[0],e+a[0].length)}else{throw new h("Invalid color",this,e)}};var n=/^(\d+(?:\.\d*)?|\.\d+)\s*([a-z]{2})/;a.prototype._innerLexSize=function(e){var t=this._input.slice(e);var i=t.match(r)[0];e+=i.length;t=t.slice(i.length);var a;if(a=t.match(n)){var s=a[2];if(s!=="em"&&s!=="ex"){throw new h("Invalid unit: '"+s+"'",this,e)}return new l("size",{number:+a[1],unit:s},e+a[0].length)}throw new h("Invalid size",this,e)};a.prototype._innerLexWhitespace=function(e){var t=this._input.slice(e);var i=t.match(r)[0];e+=i.length;return new l("whitespace",i,e)};a.prototype.lex=function(e,t){if(t==="math"){return this._innerLex(e,s,true)}else if(t==="text"){return this._innerLex(e,p,false)}else if(t==="color"){return this._innerLexColor(e)}else if(t==="size"){return this._innerLexSize(e)}else if(t==="whitespace"){return this._innerLexWhitespace(e)}};t.exports=a},{"./ParseError":4}],3:[function(e,t,i){function h(e,t,i,h,a){this.style=e;this.color=i;this.size=t;if(h===undefined){h=e}this.parentStyle=h;if(a===undefined){a=t}this.parentSize=a}h.prototype.withStyle=function(e){return new h(e,this.size,this.color,this.style,this.size)};h.prototype.withSize=function(e){return new h(this.style,e,this.color,this.style,this.size)};h.prototype.withColor=function(e){return new h(this.style,this.size,e,this.style,this.size)};h.prototype.reset=function(){return new h(this.style,this.size,this.color,this.style,this.size)};var a={"katex-blue":"#6495ed","katex-orange":"#ffa500","katex-pink":"#ff00af","katex-red":"#df0030","katex-green":"#28ae7b","katex-gray":"gray","katex-purple":"#9d38bd"};h.prototype.getColor=function(){return a[this.color]||this.color};t.exports=h},{}],4:[function(e,t,i){function h(e,t,i){var a="KaTeX parse error: "+e;if(t!==undefined&&i!==undefined){a+=" at position "+i+": ";var l=t._input;l=l.slice(0,i)+"̲"+l.slice(i);var s=Math.max(0,i-15);var p=i+15;a+=l.slice(s,p)}var r=new Error(a);r.name="ParseError";r.__proto__=h.prototype;return r}h.prototype.__proto__=Error.prototype;t.exports=h},{}],5:[function(e,t,i){var h=e("./functions");var a=e("./Lexer");var l=e("./symbols");var s=e("./utils");var p=e("./ParseError");function r(e){this.lexer=new a(e)}function c(e,t,i){this.type=e;this.value=t;this.mode=i}function g(e,t){this.result=e;this.position=t}function d(e,t,i,h,a){this.result=e;this.isFunction=t;this.allowedInText=i;this.numArgs=h;this.argTypes=a}r.prototype.expect=function(e,t){if(e.type!==t){throw new p("Expected '"+t+"', got '"+e.type+"'",this.lexer,e.position)}};r.prototype.parse=function(e){var t=this.parseInput(0,"math");return t.result};r.prototype.parseInput=function(e,t){var i=this.parseExpression(e,t);var h=this.lexer.lex(i.position,t);this.expect(h,"EOF");return i};r.prototype.handleExpressionBody=function(e,t){var i=[];var h;while(h=this.parseAtom(e,t)){i.push(h.result);e=h.position}return{body:i,position:e}};r.prototype.parseExpression=function(e,t){var i=this.handleExpressionBody(e,t);return new g(i.body,i.position)};var n=1;r.prototype.handleSupSubscript=function(e,t,i,a){var l=this.parseGroup(e,t);if(!l){throw new p("Expected group after '"+i+"'",this.lexer,e)}else if(l.numArgs>0){var s=h.getGreediness(l.result.result);if(s>n){return this.parseFunction(e,t)}else{throw new p("Got function '"+l.result.result+"' with no arguments "+"as "+a,this.lexer,e)}}else{return l.result}};r.prototype.parseAtom=function(e,t){var i=this.parseImplicitGroup(e,t);if(t==="text"){return i}var h;if(!i){h=e;i=undefined}else{h=i.position}var a;var l;while(true){var s=this.lexer.lex(h,t);var r;if(s.type==="^"){if(a){throw new p("Double superscript",this.lexer,h)}var d=this.handleSupSubscript(s.position,t,s.type,"superscript");h=d.position;a=d.result}else if(s.type==="_"){if(l){throw new p("Double subscript",this.lexer,h)}var d=this.handleSupSubscript(s.position,t,s.type,"subscript");h=d.position;l=d.result}else if(s.type==="'"){var n=new c("textord","\\prime",t);var o=[n];h=s.position;while((s=this.lexer.lex(h,t)).type==="'"){o.push(n);h=s.position}a=new c("ordgroup",o,t)}else{break}}if(a||l){return new g(new c("supsub",{base:i&&i.result,sup:a,sub:l},t),h)}else{return i}};var o=["\\tiny","\\scriptsize","\\footnotesize","\\small","\\normalsize","\\large","\\Large","\\LARGE","\\huge","\\Huge"];var w=["\\displaystyle","\\textstyle","\\scriptstyle","\\scriptscriptstyle"];r.prototype.parseImplicitGroup=function(e,t){var i=this.parseSymbol(e,t);if(!i||!i.result){return this.parseFunction(e,t)}var h=i.result.result;if(h==="\\left"){var a=this.parseFunction(e,t);var l=this.handleExpressionBody(a.position,t);var r=this.parseSymbol(l.position,t);if(r&&r.result.result==="\\right"){var d=this.parseFunction(l.position,t);return new g(new c("leftright",{body:l.body,left:a.result.value.value,right:d.result.value.value},t),d.position)}else{throw new p("Missing \\right",this.lexer,l.position)}}else if(h==="\\right"){return null}else if(s.contains(o,h)){var l=this.handleExpressionBody(i.result.position,t);return new g(new c("sizing",{size:"size"+(s.indexOf(o,h)+1),value:l.body},t),l.position)}else if(s.contains(w,h)){var l=this.handleExpressionBody(i.result.position,t);return new g(new c("styling",{style:h.slice(1,h.length-5),value:l.body},t),l.position)}else{return this.parseFunction(e,t)}};r.prototype.parseFunction=function(e,t){var i=this.parseGroup(e,t);if(i){if(i.isFunction){var a=i.result.result;if(t==="text"&&!i.allowedInText){throw new p("Can't use function '"+a+"' in text mode",this.lexer,i.position)}var l=i.result.position;var s;if(i.numArgs>0){var r=h.getGreediness(a);var d=[a];var n=[l];for(var o=0;o<i.numArgs;o++){var w=i.argTypes&&i.argTypes[o];if(w){var k=this.parseSpecialGroup(l,w,t)}else{var k=this.parseGroup(l,t)}if(!k){throw new p("Expected group after '"+i.result.result+"'",this.lexer,l)}var u;if(k.numArgs>0){var m=h.getGreediness(k.result.result);if(m>r){u=this.parseFunction(l,t)}else{throw new p("Got function '"+k.result.result+"' as "+"argument to function '"+i.result.result+"'",this.lexer,k.result.position-1)}}else{u=k.result}d.push(u.result);n.push(u.position);l=u.position}d.push(n);s=h.funcs[a].handler.apply(this,d)}else{s=h.funcs[a].handler.apply(this,[a])}return new g(new c(s.type,s,t),l)}else{return i.result}}else{return null}};r.prototype.parseSpecialGroup=function(e,t,i){if(t==="color"||t==="size"){var h=this.lexer.lex(e,i);this.expect(h,"{");var a=this.lexer.lex(h.position,t);var l=this.lexer.lex(a.position,i);this.expect(l,"}");return new d(new g(new c("color",a.text,i),l.position),false)}else if(t==="text"){var s=this.lexer.lex(e,"whitespace");return this.parseGroup(s.position,t)}else{return this.parseGroup(e,t)}};r.prototype.parseGroup=function(e,t){var i=this.lexer.lex(e,t);if(i.type==="{"){var h=this.parseExpression(i.position,t);var a=this.lexer.lex(h.position,t);this.expect(a,"}");return new d(new g(new c("ordgroup",h.result,t),a.position),false)}else{return this.parseSymbol(e,t)}};r.prototype.parseSymbol=function(e,t){var i=this.lexer.lex(e,t);if(h.funcs[i.type]){var a=h.funcs[i.type];var s=a.argTypes;if(s){s=s.slice();for(var p=0;p<s.length;p++){if(s[p]==="original"){s[p]=t}}}return new d(new g(i.type,i.position),true,a.allowedInText,a.numArgs,s)}else if(l[t][i.text]){return new d(new g(new c(l[t][i.text].group,i.text,t),i.position),false)}else{return null}};t.exports=r},{"./Lexer":2,"./ParseError":4,"./functions":12,"./symbols":14,"./utils":15}],6:[function(e,t,i){function h(e,t,i,h){this.id=e;this.size=t;this.cramped=h;this.sizeMultiplier=i}h.prototype.sup=function(){return w[k[this.id]]};h.prototype.sub=function(){return w[u[this.id]]};h.prototype.fracNum=function(){return w[m[this.id]]};h.prototype.fracDen=function(){return w[f[this.id]]};h.prototype.cramp=function(){return w[v[this.id]]};h.prototype.cls=function(){return n[this.size]+(this.cramped?" cramped":" uncramped")};h.prototype.reset=function(){return o[this.size]};var a=0;var l=1;var s=2;var p=3;var r=4;var c=5;var g=6;var d=7;var n=["displaystyle textstyle","textstyle","scriptstyle","scriptscriptstyle"];var o=["reset-textstyle","reset-textstyle","reset-scriptstyle","reset-scriptscriptstyle"];var w=[new h(a,0,1,false),new h(l,0,1,true),new h(s,1,1,false),new h(p,1,1,true),new h(r,2,.7,false),new h(c,2,.7,true),new h(g,3,.5,false),new h(d,3,.5,true)];var k=[r,c,r,c,g,d,g,d];var u=[c,c,c,c,d,d,d,d];var m=[s,p,r,c,g,d,g,d];var f=[p,p,c,c,d,d,d,d];var v=[l,l,p,p,c,c,d,d];t.exports={DISPLAY:w[a],TEXT:w[s],SCRIPT:w[r],SCRIPTSCRIPT:w[g]}},{}],7:[function(e,t,i){var h=e("./domTree");var a=e("./fontMetrics");var l=e("./symbols");var s=function(e,t,i,s,p){if(l[i][e]&&l[i][e].replace){e=l[i][e].replace}var r=a.getCharacterMetrics(e,t);var c;if(r){c=new h.symbolNode(e,r.height,r.depth,r.italic,r.skew,p)}else{typeof console!=="undefined"&&console.warn("No character metrics for '"+e+"' in style '"+t+"'");c=new h.symbolNode(e,0,0,0,0,p)}if(s){c.style.color=s}return c};var p=function(e,t,i,h){return s(e,"Math-Italic",t,i,h.concat(["mathit"]))};var r=function(e,t,i,h){if(l[t][e].font==="main"){return s(e,"Main-Regular",t,i,h)}else{return s(e,"AMS-Regular",t,i,h.concat(["amsrm"]))}};var c=function(e){var t=0;var i=0;var h=0;if(e.children){for(var a=0;a<e.children.length;a++){if(e.children[a].height>t){t=e.children[a].height}if(e.children[a].depth>i){i=e.children[a].depth}if(e.children[a].maxFontSize>h){h=e.children[a].maxFontSize}}}e.height=t;e.depth=i;e.maxFontSize=h};var g=function(e,t,i){var a=new h.span(e,t);c(a);if(i){a.style.color=i}return a};var d=function(e){var t=new h.documentFragment(e);c(t);return t};var n=function(e,t){var i=g([],[new h.symbolNode("​")]);i.style.fontSize=t/e.style.sizeMultiplier+"em";var a=g(["fontsize-ensurer","reset-"+e.size,"size5"],[i]);return a};var o=function(e,t,i,a){var l;if(t==="individualShift"){var s=e;e=[s[0]];l=-s[0].shift-s[0].elem.depth;var p=l;for(var r=1;r<s.length;r++){var c=-s[r].shift-p-s[r].elem.depth;var d=c-(s[r-1].elem.height+s[r-1].elem.depth);p=p+c;e.push({type:"kern",size:d});e.push(s[r])}}else if(t==="top"){var o=i;for(var r=0;r<e.length;r++){if(e[r].type==="kern"){o-=e[r].size}else{o-=e[r].elem.height+e[r].elem.depth}}l=o}else if(t==="bottom"){l=-i}else if(t==="shift"){l=-e[0].elem.depth-i}else if(t==="firstBaseline"){l=-e[0].elem.depth}else{l=0}var w=0;for(var r=0;r<e.length;r++){if(e[r].type==="elem"){w=Math.max(w,e[r].elem.maxFontSize)}}var k=n(a,w);var u=[];var p=l;for(var r=0;r<e.length;r++){if(e[r].type==="kern"){p+=e[r].size}else{var m=e[r].elem;var f=-m.depth-p;p+=m.height+m.depth;var v=g([],[k,m]);v.height-=f;v.depth+=f;v.style.top=f+"em";u.push(v)}}var y=g(["baseline-fix"],[k,new h.symbolNode("​")]);u.push(y);var x=g(["vlist"],u);x.height=Math.max(p,x.height);x.depth=Math.max(-l,x.depth);return x};t.exports={makeSymbol:s,mathit:p,mathrm:r,makeSpan:g,makeFragment:d,makeVList:o}},{"./domTree":10,"./fontMetrics":11,"./symbols":14}],8:[function(e,t,i){var h=e("./Options");var a=e("./ParseError");var l=e("./Style");var s=e("./buildCommon");var p=e("./delimiter");var r=e("./domTree");var c=e("./fontMetrics");var g=e("./parseTree");var d=e("./symbols");var n=e("./utils");var o=s.makeSpan;var w=function(e,t,i){var h=[];for(var a=0;a<e.length;a++){var l=e[a];h.push(b(l,t,i));i=l}return h};var k={mathord:"mord",textord:"mord",bin:"mbin",rel:"mrel",text:"mord",open:"mopen",close:"mclose",inner:"minner",frac:"minner",spacing:"mord",punct:"mpunct",ordgroup:"mord",op:"mop",katex:"mord",overline:"mord",rule:"mord",leftright:"minner",sqrt:"mord",accent:"mord"};var 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":{font:"main",group:"spacing",replace:" "}," ":{font:"main",group:"spacing",replace:" "},"~":{font:"main",group:"spacing",replace:" "}}};var a='0123456789/@."';for(var l=0;l<a.length;l++){var s=a.charAt(l);h["math"][s]={font:"main",group:"textord"}}var p="0123456789`!@*()-=+[]'\";:?/.,";for(var l=0;l<p.length;l++){var s=p.charAt(l);h["text"][s]={font:"main",group:"textord"}}var r="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";for(var l=0;l<r.length;l++){var s=r.charAt(l);h["math"][s]={font:"main",group:"mathord"};h["text"][s]={font:"main",group:"textord"}}t.exports=h},{}],15:[function(e,t,i){var h=Array.prototype.indexOf;var a=function(e,t){if(e==null){return-1}if(h&&e.indexOf===h){return e.indexOf(t)}var i=0,a=e.length;for(;i<a;i++){if(e[i]===t){return i}}return-1};var l=function(e,t){return a(e,t)!==-1};var s=/([A-Z])/g;var p=function(e){return e.replace(s,"-$1").toLowerCase()};var r={"&":"&amp;",">":"&gt;","<":"&lt;",'"':"&quot;","'":"&#x27;"};var c=/[&><"']/g;function g(e){return r[e]}function d(e){return(""+e).replace(c,g)}var n;if(typeof document!=="undefined"){var o=document.createElement("span");if("textContent"in o){n=function(e,t){e.textContent=t}}else{n=function(e,t){e.innerText=t}}}function w(e){n(e,"")}t.exports={contains:l,escape:d,hyphenate:p,indexOf:a,setTextContent:n,clearNode:w}},{}]},{},[1])(1)});
\ No newline at end of file
diff --git a/src/librustdoc/html/static/main.css b/src/librustdoc/html/static/main.css
index 7eec634405b72..8a3203deef22e 100644
--- a/src/librustdoc/html/static/main.css
+++ b/src/librustdoc/html/static/main.css
@@ -304,6 +304,10 @@ nav.sub {
 
 .content .impl-methods .docblock { margin-left: 40px; }
 
+.math-display {
+    text-align: center;
+}
+
 nav {
     border-bottom: 1px solid #e0e0e0;
     padding-bottom: 10px;
diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 6992a96659295..f4cf5dd219780 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 /*jslint browser: true, es5: true */
-/*globals $: true, rootPath: true */
+/*globals $: true, rootPath: true, useKaTeX: true, katex: true */
 
 (function() {
     "use strict";
@@ -775,4 +775,15 @@
         $("#main > .docblock").before(wrapper);
     });
 
+    $(function() {
+        if (!useKaTeX) { return }
+        $(".latex-math").each(function() {
+            if (!katex) {
+                console.error("KaTeX not loaded on page requiring it")
+            }
+            var style = this.tagName == "P" ? "display" : "text";
+
+            katex.render("\\" + style + "style " + this.textContent, this);
+        })
+    })
 }());
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 237a88ded711b..aae55043ca3a2 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -174,7 +174,9 @@ pub fn opts() -> Vec<getopts::OptGroup> {
                  "FILES"),
         optopt("", "markdown-playground-url",
                "URL to send code snippets to", "URL"),
-        optflag("", "markdown-no-toc", "don't include table of contents")
+        optflag("", "markdown-no-toc", "don't include table of contents"),
+        optflag("", "markdown-enable-math",
+                "render LaTeX expressions surrounded by `$$` via the KaTeX javascript library."),
     )
 }
 
@@ -265,7 +267,8 @@ pub fn main_args(args: &[String]) -> int {
         }
         (false, true) => return markdown::render(input, output.unwrap_or(Path::new("doc")),
                                                  &matches, &external_html,
-                                                 !matches.opt_present("markdown-no-toc")),
+                                                 !matches.opt_present("markdown-no-toc"),
+                                                 matches.opt_present("markdown-enable-math")),
         (false, false) => {}
     }
 
diff --git a/src/librustdoc/markdown.rs b/src/librustdoc/markdown.rs
index 7ee58d99c27ef..1a0fab0d21ab3 100644
--- a/src/librustdoc/markdown.rs
+++ b/src/librustdoc/markdown.rs
@@ -41,7 +41,9 @@ fn extract_leading_metadata<'a>(s: &'a str) -> (Vec<&'a str>, &'a str) {
 /// Render `input` (e.g. "foo.md") into an HTML file in `output`
 /// (e.g. output = "bar" => "bar/foo.html").
 pub fn render(input: &str, mut output: Path, matches: &getopts::Matches,
-              external_html: &ExternalHtml, include_toc: bool) -> int {
+              external_html: &ExternalHtml,
+              include_toc: bool,
+              enable_math: bool) -> int {
     let input_p = Path::new(input);
     output.push(input_p.filestem().unwrap());
     output.set_extension("html");
@@ -79,12 +81,18 @@ pub fn render(input: &str, mut output: Path, matches: &getopts::Matches,
 
     reset_headers();
 
+    if enable_math {
+        markdown::enable_math.replace(Some(true));
+    }
+
     let rendered = if include_toc {
         format!("{}", MarkdownWithToc(text))
     } else {
         format!("{}", Markdown(text))
     };
 
+    let saw_math = enable_math && markdown::math_seen.get().map_or(false, |x| *x);
+
     let err = write!(
         &mut out,
         r#"<!DOCTYPE html>
@@ -95,6 +103,7 @@ pub fn render(input: &str, mut output: Path, matches: &getopts::Matches,
     <title>{title}</title>
 
     {css}
+    {math_css}
     {in_header}
 </head>
 <body class="rustdoc">
@@ -112,6 +121,7 @@ pub fn render(input: &str, mut output: Path, matches: &getopts::Matches,
         window.playgroundUrl = "{playground}";
     </script>
     {after_content}
+    {math_js}
 </body>
 </html>"#,
         title = Escape(title),
@@ -121,6 +131,26 @@ pub fn render(input: &str, mut output: Path, matches: &getopts::Matches,
         text = rendered,
         after_content = external_html.after_content,
         playground = playground,
+
+        math_css = if saw_math {
+            "<link rel=\"stylesheet\" type=\"text/css\" href=\"katex/katex.min.css\">
+<style>.math-display { text-align: center; }</style>"
+        } else {
+            ""
+        },
+        math_js = if saw_math {
+            r#"<script src="katex/katex.min.js"></script>
+<script type="text/javascript">
+var elements = document.getElementsByClassName("latex-math");
+for (var i = 0; i < elements.length; i++) {
+   var e = elements[i];
+   var style = e.tagName == "P" ? "display" : "text";
+   katex.render("\\" + style + "style " + e.textContent, e);
+}
+</script>"#
+        } else {
+            ""
+        }
         );
 
     match err {
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 299e41f72191d..2a2c73cb0129a 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -103,7 +103,8 @@
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/master/",
-       html_playground_url = "http://play.rust-lang.org/")]
+       html_playground_url = "http://play.rust-lang.org/",
+       enable_math)]
 
 #![feature(macro_rules, globs, managed_boxes, linkage)]
 #![feature(default_type_params, phase, lang_items, unsafe_destructor)]
diff --git a/src/rt/hoedown b/src/rt/hoedown
index 238c4d57cce10..ebb1a34d0f5e7 160000
--- a/src/rt/hoedown
+++ b/src/rt/hoedown
@@ -1 +1 @@
-Subproject commit 238c4d57cce10d33b05cf52a91fc62a09f31ffbb
+Subproject commit ebb1a34d0f5e7269c91130303bf5516577b0b9a6