diff --git a/Parser.js b/Parser.js
index 740ed4f2f..1bc2aede2 100644
--- a/Parser.js
+++ b/Parser.js
@@ -259,6 +259,30 @@ Parser.prototype.parseTextGroup = function(pos, mode) {
     }
 };
 
+var delimiters = [
+    "(", ")", "[", "\\lbrack", "]", "\\rbrack",
+    "\\{", "\\lbrace", "\\}", "\\rbrace",
+    "\\lfloor", "\\rfloor", "\\lceil", "\\rceil",
+    "<", ">", "\\langle", "\\rangle",
+    "/", "\\backslash",
+    "|", "\\vert", "\\|", "\\Vert",
+    "\\uparrow", "\\Uparrow",
+    "\\downarrow", "\\Downarrow",
+    "\\updownarrow", "\\Updownarrow"
+];
+
+// Parse a single delimiter
+Parser.prototype.parseDelimiter = function(pos, mode) {
+    var delim = this.lexer.lex(pos, mode);
+    if (utils.contains(delimiters, delim.text)) {
+        return new ParseResult(
+            new ParseNode("delimiter", delim.text),
+            delim.position);
+    } else {
+        return null;
+    }
+};
+
 // A list of 1-argument color functions
 var colorFuncs = [
     "\\blue", "\\orange", "\\pink", "\\red", "\\green", "\\gray", "\\purple"
@@ -278,6 +302,25 @@ var namedFns = [
     "\\tan","\\tanh"
 ];
 
+var delimiterSizes = {
+    "\\bigl" : {type: "open",    size: 1},
+    "\\Bigl" : {type: "open",    size: 2},
+    "\\biggl": {type: "open",    size: 3},
+    "\\Biggl": {type: "open",    size: 4},
+    "\\bigr" : {type: "close",   size: 1},
+    "\\Bigr" : {type: "close",   size: 2},
+    "\\biggr": {type: "close",   size: 3},
+    "\\Biggr": {type: "close",   size: 4},
+    "\\bigm" : {type: "rel",     size: 1},
+    "\\Bigm" : {type: "rel",     size: 2},
+    "\\biggm": {type: "rel",     size: 3},
+    "\\Biggm": {type: "rel",     size: 4},
+    "\\big"  : {type: "textord", size: 1},
+    "\\Big"  : {type: "textord", size: 2},
+    "\\bigg" : {type: "textord", size: 3},
+    "\\Bigg" : {type: "textord", size: 4}
+};
+
 // Parses a "nucleus", which is either a single token from the tokenizer or a
 // function and its arguments
 Parser.prototype.parseNucleus = function(pos, mode) {
@@ -348,6 +391,23 @@ Parser.prototype.parseNucleus = function(pos, mode) {
         return new ParseResult(
             new ParseNode("namedfn", nucleus.text, mode),
             nucleus.position);
+    } else if (mode === "math" && delimiterSizes[nucleus.type]) {
+        // If this is a delimiter size function, we parse a single delimiter
+        var delim = this.parseDelimiter(nucleus.position, mode);
+        if (delim) {
+            var type = delimiterSizes[nucleus.type].type;
+
+            return new ParseResult(
+                new ParseNode("delimsizing", {
+                    size: delimiterSizes[nucleus.type].size,
+                    type: delimiterSizes[nucleus.type].type,
+                    value: delim.result.value
+                }, mode),
+                delim.position);
+        } else {
+            throw new ParseError(
+                "Expected delimiter after '" + nucleus.text + "'");
+        }
     } else if (nucleus.type === "\\llap" || nucleus.type === "\\rlap") {
         // If this is an llap or rlap, parse its argument and return
         var group = this.parseGroup(nucleus.position, mode);
diff --git a/buildTree.js b/buildTree.js
index f8fe16238..43e345c28 100644
--- a/buildTree.js
+++ b/buildTree.js
@@ -70,6 +70,8 @@ var getTypeOfGroup = function(group) {
         return getTypeOfGroup(group.value.value);
     } else if (group.type === "sizing") {
         return getTypeOfGroup(group.value.value);
+    } else if (group.type === "delimsizing") {
+        return group.value.type;
     } else {
         return groupToType[group.type];
     }
@@ -180,7 +182,7 @@ var groupTypes = {
         }
 
         var supsub;
-        var fixIE = makeSpan(["fix-ie"], []);
+        var fixIE = makeSpan(["fix-ie"], [new domTree.textNode("\u00a0")]);
 
         if (!group.value.sup) {
             v = Math.max(v, fontMetrics.metrics.sub1,
@@ -303,7 +305,7 @@ var groupTypes = {
         denomrow.height = 0;
         denomrow.depth = denomrow.depth + v;
 
-        var fixIE = makeSpan(["fix-ie"], []);
+        var fixIE = makeSpan(["fix-ie"], [new domTree.textNode("\u00a0")]);
 
         var frac = makeSpan([], [numerrow, mid, denomrow, fixIE]);
 
@@ -425,6 +427,165 @@ var groupTypes = {
             ["sizing", "reset-" + options.size, group.value.size,
                 getTypeOfGroup(group.value.value)],
             [inner]);
+    },
+
+    delimsizing: function(group, options, prev) {
+        var normalDelimiters = [
+            "(", ")", "[", "\\lbrack", "]", "\\rbrack",
+            "\\{", "\\lbrace", "\\}", "\\rbrace",
+            "\\lfloor", "\\rfloor", "\\lceil", "\\rceil",
+            "<", ">", "\\langle", "\\rangle", "/", "\\backslash"
+        ];
+
+        var stackDelimiters = [
+            "\\uparrow", "\\downarrow", "\\updownarrow",
+            "\\Uparrow", "\\Downarrow", "\\Updownarrow",
+            "|", "\\|", "\\vert", "\\Vert"
+        ];
+
+        // Metrics of the different sizes. Found by looking at TeX's output of
+        // $\bigl| \Bigl| \biggl| \Biggl| \showlists$
+        var sizeToMetrics = {
+            1: {height: .85, depth: .35},
+            2: {height: 1.15, depth: .65},
+            3: {height: 1.45, depth: .95},
+            4: {height: 1.75, depth: 1.25}
+        };
+
+        // Make an inner span with the given offset and in the given font
+        var makeInner = function(symbol, offset, font) {
+            var sizeClass;
+            if (font === "size1-regular") {
+                sizeClass = "size1";
+            }
+
+            var inner = makeSpan(
+                ["delimsizinginner", sizeClass],
+                [makeSpan([], [makeText(symbol, font, group.mode)])]);
+
+            inner.style.top = offset + "em";
+            inner.height -= offset;
+            inner.depth += offset;
+
+            return inner;
+        };
+
+        // Get the metrics for a given symbol and font, after transformation
+        var getMetrics = function(symbol, font) {
+            if (symbols["math"][symbol] && symbols["math"][symbol].replace) {
+                return fontMetrics.getCharacterMetrics(
+                    symbols["math"][symbol].replace, font);
+            } else {
+                return fontMetrics.getCharacterMetrics(
+                    symbol, font);
+            }
+        };
+
+        var original = group.value.value;
+
+        if (utils.contains(normalDelimiters, original)) {
+            // These delimiters can be created by simply using the size1-size4
+            // fonts, so they don't require special treatment
+            if (original === "<") {
+                original = "\\langle";
+            } else if (original === ">") {
+                original = "\\rangle";
+            }
+
+            var size = "size" + group.value.size;
+            var inner = mathrmSize(
+                original, group.value.size, group.mode);
+
+            return makeSpan(
+                ["delimsizing", size, groupToType[group.value.type]],
+                [inner], options.getColor());
+        } else if (utils.contains(stackDelimiters, original)) {
+            // These delimiters can be created by stacking other delimiters on
+            // top of each other to create the correct size
+
+            // There are three parts, the top, a repeated middle, and a bottom.
+            var top = middle = bottom = original;
+            var font = "size1-regular";
+            var overlap = false;
+
+            // We set the parts and font based on the symbol. Note that we use
+            // '\u23d0' instead of '|' and '\u2016' instead of '\\|' for the
+            // middles of the arrows
+            if (original === "\\uparrow") {
+                middle = bottom = "\u23d0";
+            } else if (original === "\\Uparrow") {
+                middle = bottom = "\u2016";
+            } else if (original === "\\downarrow") {
+                top = middle = "\u23d0";
+            } else if (original === "\\Downarrow") {
+                top = middle = "\u2016";
+            } else if (original === "\\updownarrow") {
+                top = "\\uparrow";
+                middle = "\u23d0";
+                bottom = "\\downarrow";
+            } else if (original === "\\Updownarrow") {
+                top = "\\Uparrow";
+                middle = "\u2016";
+                bottom = "\\Downarrow";
+            } else if (original === "|" || original === "\\vert") {
+                overlap = true;
+            } else if (original === "\\|" || original === "\\Vert") {
+                overlap = true;
+            }
+
+            // Get the metrics of the final symbol
+            var metrics = sizeToMetrics[group.value.size];
+            var heightTotal = metrics.height + metrics.depth;
+
+            // Get the metrics of the three sections
+            var topMetrics = getMetrics(top, font);
+            var topHeightTotal = topMetrics.height + topMetrics.depth;
+            var middleMetrics = getMetrics(middle, font);
+            var middleHeightTotal = middleMetrics.height + middleMetrics.depth;
+            var bottomMetrics = getMetrics(bottom, font);
+            var bottomHeightTotal = bottomMetrics.height + bottomMetrics.depth;
+
+            var middleHeight = heightTotal - topHeightTotal - bottomHeightTotal;
+            var symbolCount = Math.ceil(middleHeight / middleHeightTotal);
+
+            if (overlap) {
+                // 2 * overlapAmount + middleHeight =
+                // (symbolCount - 1) * (middleHeightTotal - overlapAmount) +
+                //     middleHeightTotal
+                var overlapAmount = (symbolCount * middleHeightTotal -
+                                     middleHeight) / (symbolCount + 1);
+            } else {
+                var overlapAmount = 0;
+            }
+
+            // Keep a list of the inner spans
+            var inners = [];
+
+            // Add the top symbol
+            inners.push(
+                makeInner(top, topMetrics.height - metrics.height, font));
+
+            // Add middle symbols until there's only space for the bottom symbol
+            var curr_height = metrics.height - topHeightTotal + overlapAmount;
+            for (var i = 0; i < symbolCount; i++) {
+                inners.push(
+                    makeInner(middle, middleMetrics.height - curr_height, font));
+                curr_height -= middleHeightTotal - overlapAmount;
+            }
+
+            // Add the bottom symbol
+            inners.push(
+                makeInner(bottom, metrics.depth - bottomMetrics.depth, font));
+
+            var fixIE = makeSpan(["fix-ie"], [new domTree.textNode("\u00a0")]);
+            inners.push(fixIE);
+
+            return makeSpan(
+                ["delimsizing", "mult", groupToType[group.value.type]],
+                inners, options.getColor());
+        } else {
+            throw new ParseError("Illegal delimiter: '" + original + "'");
+        }
     }
 };
 
@@ -478,7 +639,7 @@ var buildGroup = function(group, options, prev) {
 };
 
 var makeText = function(value, style, mode) {
-    if (symbols[mode][value].replace) {
+    if (symbols[mode][value] && symbols[mode][value].replace) {
         value = symbols[mode][value].replace;
     }
 
@@ -514,6 +675,10 @@ var mathrm = function(value, mode) {
     }
 };
 
+var mathrmSize = function(value, size, mode) {
+    return makeText(value, "size" + size + "-regular", mode);
+}
+
 var buildTree = function(tree) {
     // Setup the default options
     var options = new Options(Style.TEXT, "size5", "");
diff --git a/fontMetrics.js b/fontMetrics.js
index f65c99b0a..f89c09405 100644
--- a/fontMetrics.js
+++ b/fontMetrics.js
@@ -64,7 +64,7 @@ var metrics = {
 };
 
 // This map is generated by metric_parse.rb
-var metricMap = 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:0.1,"depth":0.0,"italic":0.0},"61438":{"height":0.1,"depth":0.0,"italic":0.0},"61439":{"height":0.1,"depth":0.0,"italic":0.0},"65535":{"height":0.533,"depth":0.0,"italic":0.0}},"size3-regular":{"13":{"height":0,"depth":0,"italic":0},"32":{"height":0,"depth":0,"italic":0},"40":{"height":1.45,"depth":0.949,"italic":0.0},"41":{"height":1.45,"depth":0.949,"italic":0.0},"47":{"height":1.45,"depth":0.949,"italic":0.0},"91":{"height":1.45,"depth":0.949,"italic":0.0},"92":{"height":1.45,"depth":0.949,"italic":0.0},"93":{"height":1.45,"depth":0.949,"italic":0.0},"123":{"height":1.45,"depth":0.949,"italic":0.0},"125":{"height":1.45,"depth":0.949,"italic":0.0},"160":{"height":0,"depth":0,"italic":0},"710":{"height":0.772,"depth":-0.564,"italic":0.003},"732":{"height":0.749,"depth":-0.61,"italic":0.0},"770":{"height":0.772,"depth":-0.564,"italic":0.003},"771":{"height":0.749,"depth":-0.61,"italic":0.0},"8192":{"height":0,"depth":0,"italic":0},"8193":{"height":0,"depth":0,"italic":0},"8194":{"height":0,"depth":0,"italic":0},"8195":{"height":0,"depth":0,"italic":0},"8196":{"height":0,"depth":0,"italic":0},"8197":{"height":0,"depth":0,"italic":0},"8198":{"height":0,"depth":0,"italic":0},"8199":{"height":0,"depth":0,"italic":0},"8200":{"height":0,"depth":0,"italic":0},"8201":{"height":0,"depth":0,"italic":0},"8202":{"height":0,"depth":0,"italic":0},"8239":{"height":0,"depth":0,"italic":0},"8287":{"height":0,"depth":0,"italic":0},"8730":{"height":1.45,"depth":0.95,"italic":0.02},"8968":{"height":1.45,"depth":0.949,"italic":0.0},"8969":{"height":1.45,"depth":0.949,"italic":0.0},"8970":{"height":1.45,"depth":0.949,"italic":0.0},"8971":{"height":1.45,"depth":0.949,"italic":0.0},"10216":{"height":1.45,"depth":0.95,"italic":0.0},"10217":{"height":1.45,"depth":0.949,"italic":0.0},"57344":{"height":0.0,"depth":0.0,"italic":0.0},"61437":{"height":0.1,"depth":0.0,"italic":0.0},"61438":{"height":0.1,"depth":0.0,"italic":0.0},"61439":{"height":0.1,"depth":0.0,"italic":0.0},"65535":{"height":0.533,"depth":0.0,"italic":0.0}},"size4-regular":{"13":{"height":0,"depth":0,"italic":0},"32":{"height":0,"depth":0,"italic":0},"40":{"height":1.75,"depth":1.249,"italic":0.0},"41":{"height":1.75,"depth":1.249,"italic":0.0},"47":{"height":1.75,"depth":1.249,"italic":0.0},"91":{"height":1.75,"depth":1.249,"italic":0.0},"92":{"height":1.75,"depth":1.249,"italic":0.0},"93":{"height":1.75,"depth":1.249,"italic":0.0},"123":{"height":1.75,"depth":1.249,"italic":0.0},"125":{"height":1.75,"depth":1.249,"italic":0.0},"160":{"height":0,"depth":0,"italic":0},"710":{"height":0.845,"depth":-0.561,"italic":0.013},"732":{"height":0.823,"depth":-0.583,"italic":0.0},"770":{"height":0.845,"depth":-0.561,"italic":0.013},"771":{"height":0.823,"depth":-0.583,"italic":0.0},"8192":{"height":0,"depth":0,"italic":0},"8193":{"height":0,"depth":0,"italic":0},"8194":{"height":0,"depth":0,"italic":0},"8195":{"height":0,"depth":0,"italic":0},"8196":{"height":0,"depth":0,"italic":0},"8197":{"height":0,"depth":0,"italic":0},"8198":{"height":0,"depth":0,"italic":0},"8199":{"height":0,"depth":0,"italic":0},"8200":{"height":0,"depth":0,"italic":0},"8201":{"height":0,"depth":0,"italic":0},"8202":{"height":0,"depth":0,"italic":0},"8239":{"height":0,"depth":0,"italic":0},"8287":{"height":0,"depth":0,"italic":0},"8730":{"height":1.75,"depth":1.25,"italic":0.02},"8968":{"height":1.75,"depth":1.249,"italic":0.0},"8969":{"height":1.75,"depth":1.249,"italic":0.0},"8970":{"height":1.75,"depth":1.249,"italic":0.0},"8971":{"height":1.75,"depth":1.249,"italic":0.0},"9115":{"height":1.154,"depth":0.655,"italic":0.0},"9116":{"height":0.61,"depth":0.01,"italic":0.0},"9117":{"height":1.165,"depth":0.644,"italic":0.0},"9118":{"height":1.154,"depth":0.655,"italic":0.0},"9119":{"height":0.61,"depth":0.01,"italic":0.0},"9120":{"height":1.165,"depth":0.644,"italic":0.0},"9121":{"height":1.154,"depth":0.645,"italic":0.0},"9122":{"height":0.602,"depth":0.0,"italic":0.0},"9123":{"height":1.155,"depth":0.644,"italic":0.0},"9124":{"height":1.154,"depth":0.645,"italic":0.0},"9125":{"height":0.602,"depth":0.0,"italic":0.0},"9126":{"height":1.155,"depth":0.644,"italic":0.0},"9127":{"height":0.899,"depth":0.01,"italic":0.0},"9128":{"height":1.16,"depth":0.66,"italic":0.0},"9129":{"height":0.01,"depth":0.899,"italic":0.0},"9130":{"height":0.31,"depth":0.01,"italic":0.0},"9131":{"height":0.899,"depth":0.01,"italic":0.0},"9132":{"height":1.16,"depth":0.66,"italic":0.0},"9133":{"height":0.01,"depth":0.899,"italic":0.0},"9143":{"height":0.935,"depth":0.885,"italic":0.0},"10216":{"height":1.75,"depth":1.248,"italic":0.0},"10217":{"height":1.75,"depth":1.248,"italic":0.0},"57344":{"height":0.0,"depth":0.0,"italic":0.0},"57345":{"height":0.605,"depth":0.014,"italic":0.021},"57680":{"height":0.12,"depth":0.213,"italic":0.01},"57681":{"height":0.12,"depth":0.213,"italic":0.024},"57682":{"height":0.333,"depth":0.0,"italic":0.01},"57683":{"height":0.333,"depth":0.0,"italic":0.024},"57684":{"height":0.12,"depth":0.0,"italic":0.01},"61437":{"height":0.1,"depth":0.0,"italic":0.0},"61438":{"height":0.1,"depth":0.0,"italic":0.0},"61439":{"height":0.1,"depth":0.0,"italic":0.0},"65535":{"height":0.533,"depth":0.0,"italic":0.0}}};
 
 var getCharacterMetrics = function(character, style) {
     return metricMap[style][character.charCodeAt(0)];
diff --git a/metric_parse.rb b/metric_parse.rb
index 551647145..d72c22d08 100644
--- a/metric_parse.rb
+++ b/metric_parse.rb
@@ -39,7 +39,8 @@ end
 font_dir = File.join(File.dirname(__FILE__), 'static/fonts/')
 metrics = {}
 
-%w[main-regular math-italic ams-regular].each do |face|
+%w[main-regular math-italic ams-regular
+   size1-regular size2-regular size3-regular size4-regular].each do |face|
   metrics[face] = metrics_for_file(File.join(font_dir, 'katex_%s.ttf' % face))
 end
 
diff --git a/static/katex.less b/static/katex.less
index c274eb5cc..5b1caead7 100644
--- a/static/katex.less
+++ b/static/katex.less
@@ -308,38 +308,63 @@ big parens
         }
     }
 
-    .sizing { display: inline-block; }
+    .sizing {
+        display: inline-block;
 
-    @size-1: 0.5;
-    @size-2: 0.7;
-    @size-3: 0.8;
-    @size-4: 0.9;
-    @size-5: 1.0;
-    @size-6: 1.2;
-    @size-7: 1.44;
-    @size-8: 1.73;
-    @size-9: 2.07;
-    @size-10: 2.49;
+        @size-1: 0.5;
+        @size-2: 0.7;
+        @size-3: 0.8;
+        @size-4: 0.9;
+        @size-5: 1.0;
+        @size-6: 1.2;
+        @size-7: 1.44;
+        @size-8: 1.73;
+        @size-9: 2.07;
+        @size-10: 2.49;
 
-    .generate-size-change(@from, @to) {
-        .reset-size@{from}.size@{to} {
-            @sizeFromVariable: ~"size-@{from}";
-            @sizeToVariable: ~"size-@{to}";
-            font-size: (@@sizeToVariable / @@sizeFromVariable) * 1em;
+        .generate-size-change(@from, @to) {
+            &.reset-size@{from}.size@{to} {
+                @sizeFromVariable: ~"size-@{from}";
+                @sizeToVariable: ~"size-@{to}";
+                font-size: (@@sizeToVariable / @@sizeFromVariable) * 1em;
+            }
+        }
+
+        .generate-to-size-change(@from, @currTo) when (@currTo =< 10) {
+            .generate-size-change(@from, @currTo);
+
+            .generate-to-size-change(@from, (@currTo + 1));
+        }
+
+        .generate-from-size-change(@currFrom) when (@currFrom =< 10) {
+            .generate-to-size-change(@currFrom, 1);
+
+            .generate-from-size-change((@currFrom + 1));
+        }
+
+        .generate-from-size-change(1);
+    }
+
+    .delimsizing {
+        &.size1 { font-family: katex_size1; }
+        &.size2 { font-family: katex_size2; }
+        &.size3 { font-family: katex_size3; }
+        &.size4 { font-family: katex_size4; }
+
+        &.mult {
+            .baseline-align-hack-outer;
+
+            > .fix-ie,
+            > .delimsizinginner {
+                .baseline-align-hack-middle;
+                position: relative;
+
+                &.size1 {
+                    > span {
+                        font-family: katex_size1;
+                    }
+                }
+            }
         }
     }
-
-    .generate-to-size-change(@from, @currTo) when (@currTo =< 10) {
-        .generate-size-change(@from, @currTo);
-
-        .generate-to-size-change(@from, (@currTo + 1));
-    }
-
-    .generate-from-size-change(@currFrom) when (@currFrom =< 10) {
-        .generate-to-size-change(@currFrom, 1);
-
-        .generate-from-size-change((@currFrom + 1));
-    }
-
-    .generate-from-size-change(1);
 }
diff --git a/symbols.js b/symbols.js
index 64a93ce26..41631e73f 100644
--- a/symbols.js
+++ b/symbols.js
@@ -314,7 +314,7 @@ var symbols = {
         "\\lvert": {
             font: "main",
             group: "open",
-            replace: "|"
+            replace: "\u2223"
         },
         ")": {
             font: "main",
@@ -340,7 +340,7 @@ var symbols = {
         "\\rvert": {
             font: "main",
             group: "close",
-            replace: "|"
+            replace: "\u2223"
         },
         "=": {
             font: "main",
@@ -563,6 +563,111 @@ var symbols = {
             font: "main",
             group: "textord",
             replace: "\u25b9"
+        },
+        "\\{": {
+            font: "main",
+            group: "open",
+            replace: "{"
+        },
+        "\\}": {
+            font: "main",
+            group: "close",
+            replace: "}"
+        },
+        "\\lbrace": {
+            font: "main",
+            group: "open",
+            replace: "{"
+        },
+        "\\rbrace": {
+            font: "main",
+            group: "close",
+            replace: "}"
+        },
+        "\\lbrack": {
+            font: "main",
+            group: "open",
+            replace: "["
+        },
+        "\\rbrack": {
+            font: "main",
+            group: "close",
+            replace: "]"
+        },
+        "\\lfloor": {
+            font: "main",
+            group: "open",
+            replace: "\u230a"
+        },
+        "\\rfloor": {
+            font: "main",
+            group: "close",
+            replace: "\u230b"
+        },
+        "\\lceil": {
+            font: "main",
+            group: "open",
+            replace: "\u2308"
+        },
+        "\\rceil": {
+            font: "main",
+            group: "close",
+            replace: "\u2309"
+        },
+        "\\backslash": {
+            font: "main",
+            group: "textord",
+            replace: "\\"
+        },
+        "|": {
+            font: "main",
+            group: "textord",
+            replace: "\u2223"
+        },
+        "\\vert": {
+            font: "main",
+            group: "textord",
+            replace: "\u2223"
+        },
+        "\\|": {
+            font: "main",
+            group: "textord",
+            replace: "\u2225"
+        },
+        "\\Vert": {
+            font: "main",
+            group: "textord",
+            replace: "\u2225"
+        },
+        "\\uparrow": {
+            font: "main",
+            group: "textord",
+            replace: "\u2191"
+        },
+        "\\Uparrow": {
+            font: "main",
+            group: "textord",
+            replace: "\u21d1"
+        },
+        "\\downarrow": {
+            font: "main",
+            group: "textord",
+            replace: "\u2193"
+        },
+        "\\Downarrow": {
+            font: "main",
+            group: "textord",
+            replace: "\u21d3"
+        },
+        "\\updownarrow": {
+            font: "main",
+            group: "textord",
+            replace: "\u2195"
+        },
+        "\\Updownarrow": {
+            font: "main",
+            group: "textord",
+            replace: "\u21d5"
         }
     },
     "text": {
@@ -584,7 +689,7 @@ var symbols = {
     }
 };
 
-var mathTextSymbols = "0123456789/|@.\"";
+var mathTextSymbols = "0123456789/@.\"";
 for (var i = 0; i < mathTextSymbols.length; i++) {
     var ch = mathTextSymbols.charAt(i);
     symbols["math"][ch] = {
diff --git a/test/huxley/DelimiterSizing.hux/firefox-1.png b/test/huxley/DelimiterSizing.hux/firefox-1.png
new file mode 100644
index 000000000..4ad62c262
Binary files /dev/null and b/test/huxley/DelimiterSizing.hux/firefox-1.png differ
diff --git a/test/huxley/DelimiterSizing.hux/record.json b/test/huxley/DelimiterSizing.hux/record.json
new file mode 100644
index 000000000..3cae6ac65
--- /dev/null
+++ b/test/huxley/DelimiterSizing.hux/record.json
@@ -0,0 +1,5 @@
+[
+  {
+    "action": "screenshot"
+  }
+]
diff --git a/test/huxley/Huxleyfile.json b/test/huxley/Huxleyfile.json
index 0b32adc58..42a80e516 100644
--- a/test/huxley/Huxleyfile.json
+++ b/test/huxley/Huxleyfile.json
@@ -93,5 +93,11 @@
         "name": "Lap",
         "screenSize": [1024, 768],
         "url": "http://localhost:7936/test/huxley/test.html?m=ab\\llap{f}cd\\rlap{g}h"
+    },
+
+    {
+        "name": "DelimiterSizing",
+        "screenSize": [1024, 768],
+        "url": "http://localhost:7936/test/huxley/test.html?m=\\bigl\\uparrow\\Bigl\\downarrow\\biggl\\updownarrow\\Biggl\\Uparrow\\Biggr\\Downarrow\\biggr\\langle\\Bigr\\}\\bigr\\rfloor"
     }
 ]
diff --git a/test/katex-tests.js b/test/katex-tests.js
index c9e2540f4..d645e0e1f 100644
--- a/test/katex-tests.js
+++ b/test/katex-tests.js
@@ -626,3 +626,44 @@ describe("A tie parser", function() {
         expect(parse[2].type).toMatch("spacing");
     });
 });
+
+describe("A delimiter sizing parser", function() {
+    var normalDelim = "\\bigl |";
+    var notDelim = "\\bigl x";
+    var bigDelim = "\\Biggr \\langle";
+
+    it("should parse normal delimiters", function() {
+        expect(function() {
+            parseTree(normalDelim);
+            parseTree(bigDelim);
+        }).not.toThrow();
+    });
+
+    it("should not parse not-delimiters", function() {
+        expect(function() {
+            parseTree(notDelim);
+        }).toThrow();
+    });
+
+    it("should produce a delimsizing", function() {
+        var parse = parseTree(normalDelim)[0];
+
+        expect(parse.type).toMatch("delimsizing");
+    });
+
+    it("should produce the correct direction delimiter", function() {
+        var leftParse = parseTree(normalDelim)[0];
+        var rightParse = parseTree(bigDelim)[0];
+
+        expect(leftParse.value.type).toMatch("open");
+        expect(rightParse.value.type).toMatch("close");
+    });
+
+    it("should parse the correct size delimiter", function() {
+        var smallParse = parseTree(normalDelim)[0];
+        var bigParse = parseTree(bigDelim)[0];
+
+        expect(smallParse.value.size).toEqual(1);
+        expect(bigParse.value.size).toEqual(4);
+    });
+});