diff --git a/src/delimiter.js b/src/delimiter.js
index 3e46e9dd..7dcc0ade 100644
--- a/src/delimiter.js
+++ b/src/delimiter.js
@@ -431,9 +431,9 @@ const sizeToMaxHeight = [0, 1.2, 1.8, 2.4, 3.0];
  */
 const makeSizedDelim = function(delim, size, options, mode, classes) {
     // < and > turn into \langle and \rangle in delimiters
-    if (delim === "<" || delim === "\\lt") {
+    if (delim === "<" || delim === "\\lt" || delim === "\u27e8") {
         delim = "\\langle";
-    } else if (delim === ">" || delim === "\\gt") {
+    } else if (delim === ">" || delim === "\\gt" || delim === "\u27e9") {
         delim = "\\rangle";
     }
 
@@ -549,9 +549,9 @@ const traverseSequence = function(delim, height, sequence, options) {
  */
 const makeCustomSizedDelim = function(delim, height, center, options, mode,
                                     classes) {
-    if (delim === "<" || delim === "\\lt") {
+    if (delim === "<" || delim === "\\lt" || delim === "\u27e8") {
         delim = "\\langle";
-    } else if (delim === ">" || delim === "\\gt") {
+    } else if (delim === ">" || delim === "\\gt" || delim === "\u27e9") {
         delim = "\\rangle";
     }
 
diff --git a/src/functions/delimsizing.js b/src/functions/delimsizing.js
index dc24d67b..1d2ae561 100644
--- a/src/functions/delimsizing.js
+++ b/src/functions/delimsizing.js
@@ -38,7 +38,7 @@ const delimiters = [
     "(", ")", "[", "\\lbrack", "]", "\\rbrack",
     "\\{", "\\lbrace", "\\}", "\\rbrace",
     "\\lfloor", "\\rfloor", "\\lceil", "\\rceil",
-    "<", ">", "\\langle", "\\rangle", "\\lt", "\\gt",
+    "<", ">", "\\langle", "\u27e8", "\\rangle", "\u27e9", "\\lt", "\\gt",
     "\\lvert", "\\rvert", "\\lVert", "\\rVert",
     "\\lgroup", "\\rgroup", "\\lmoustache", "\\rmoustache",
     "/", "\\backslash",
diff --git a/src/symbols.js b/src/symbols.js
index 3d82fe63..e001b867 100644
--- a/src/symbols.js
+++ b/src/symbols.js
@@ -513,14 +513,14 @@ defineSymbol(math, main, bin, "\u2228", "\\vee", true);
 defineSymbol(math, main, textord, "\u221a", "\\surd");
 defineSymbol(math, main, open, "(", "(");
 defineSymbol(math, main, open, "[", "[");
-defineSymbol(math, main, open, "\u27e8", "\\langle");
+defineSymbol(math, main, open, "\u27e8", "\\langle", true);
 defineSymbol(math, main, open, "\u2223", "\\lvert");
 defineSymbol(math, main, open, "\u2225", "\\lVert");
 defineSymbol(math, main, close, ")", ")");
 defineSymbol(math, main, close, "]", "]");
 defineSymbol(math, main, close, "?", "?");
 defineSymbol(math, main, close, "!", "!");
-defineSymbol(math, main, close, "\u27e9", "\\rangle");
+defineSymbol(math, main, close, "\u27e9", "\\rangle", true);
 defineSymbol(math, main, close, "\u2223", "\\rvert");
 defineSymbol(math, main, close, "\u2225", "\\rVert");
 defineSymbol(math, main, rel, "=", "=");
diff --git a/test/errors-spec.js b/test/errors-spec.js
index 97e859ca..864b0d84 100644
--- a/test/errors-spec.js
+++ b/test/errors-spec.js
@@ -17,13 +17,13 @@ beforeEach(function() {
                 parseTree(actual, defaultSettings);
                 return {
                     pass: false,
-                    message: "'" + actual + "' parsed without error",
+                    message: () => "'" + actual + "' parsed without error",
                 };
             } catch (e) {
                 if (expected === undefined) {
                     return {
                         pass: true,
-                        message: "'" + actual + "' parsed with error",
+                        message: () => "'" + actual + "' parsed with error",
                     };
                 }
                 const msg = e.message;
@@ -31,20 +31,20 @@ beforeEach(function() {
                 if (msg === exp) {
                     return {
                         pass: true,
-                        message: "'" + actual + "'" +
+                        message: () => "'" + actual + "'" +
                             " parsed with error '" + expected + "'",
                     };
                 } else if (msg.slice(0, 19) === prefix) {
                     return {
                         pass: false,
-                        message: "'" + actual + "'" +
+                        message: () => "'" + actual + "'" +
                             " parsed with error '" + msg.slice(19) +
                             "' but expected '" + expected + "'",
                     };
                 } else {
                     return {
                         pass: false,
-                        message: "'" + actual + "'" +
+                        message: () => "'" + actual + "'" +
                             " caused error '" + msg +
                             "' but expected '" + exp + "'",
                     };
diff --git a/test/katex-spec.js b/test/katex-spec.js
index f279bcda..b9a55dfa 100644
--- a/test/katex-spec.js
+++ b/test/katex-spec.js
@@ -107,6 +107,21 @@ const parseAndSetResult = function(expr, result, settings) {
     }
 };
 
+const buildAndSetResult = function(expr, result, settings) {
+    try {
+        return _getBuilt(expr, settings || defaultSettings);
+    } catch (e) {
+        result.pass = false;
+        if (e instanceof ParseError) {
+            result.message = "'" + expr + "' failed " +
+                "parsing with error: " + e.message;
+        } else {
+            result.message = "'" + expr + "' failed " +
+                "parsing with unknown error: " + e.message;
+        }
+    }
+};
+
 beforeEach(function() {
     expect.extend({
         toParse: function(actual, settings) {
@@ -114,7 +129,7 @@ beforeEach(function() {
 
             const result = {
                 pass: true,
-                message: "'" + actual + "' succeeded parsing",
+                message: () => "'" + actual + "' succeeded parsing",
             };
             parseAndSetResult(actual, result, usedSettings);
             return result;
@@ -125,7 +140,7 @@ beforeEach(function() {
 
             const result = {
                 pass: false,
-                message: "Expected '" + actual + "' to fail " +
+                message: () => "Expected '" + actual + "' to fail " +
                     "parsing, but it succeeded",
             };
 
@@ -150,7 +165,7 @@ beforeEach(function() {
 
             const result = {
                 pass: true,
-                message: "'" + actual + "' succeeded in building",
+                message: () => "'" + actual + "' succeeded in building",
             };
 
             expect(actual).toParse(usedSettings);
@@ -176,7 +191,7 @@ beforeEach(function() {
 
             const result = {
                 pass: true,
-                message: "Parse trees of '" + actual +
+                message: () => "Parse trees of '" + actual +
                     "' and '" + expected + "' are equivalent",
             };
 
@@ -196,7 +211,38 @@ beforeEach(function() {
 
             if (JSON.stringify(actualTree) !== JSON.stringify(expectedTree)) {
                 result.pass = false;
-                result.message = "Parse trees of '" + actual +
+                result.message = () => "Parse trees of '" + actual +
+                    "' and '" + expected + "' are not equivalent";
+            }
+            return result;
+        },
+
+        toBuildLike: function(actual, expected, settings) {
+            const usedSettings = settings ? settings : defaultSettings;
+
+            const result = {
+                pass: true,
+                message: () => "Build trees of '" + actual +
+                    "' and '" + expected + "' are equivalent",
+            };
+
+            const actualTree = buildAndSetResult(actual, result,
+                usedSettings);
+            if (!actualTree) {
+                return result;
+            }
+            const expectedTree = buildAndSetResult(expected, result,
+                usedSettings);
+            if (!expectedTree) {
+                return result;
+            }
+
+            stripPositions(actualTree);
+            stripPositions(expectedTree);
+
+            if (JSON.stringify(actualTree) !== JSON.stringify(expectedTree)) {
+                result.pass = false;
+                result.message = () => "Parse trees of '" + actual +
                     "' and '" + expected + "' are not equivalent";
             }
             return result;
@@ -1212,6 +1258,19 @@ describe("A left/right parser", function() {
     });
 });
 
+describe("left/right builder", () => {
+    const cases = [
+        ['\\left\\langle \\right\\rangle', '\\left< \\right>'],
+        ['\\left\\langle \\right\\rangle', '\\left\u27e8 \\right\u27e9'],
+    ];
+
+    for (const [actual, expected] of cases) {
+        it(`should build "${actual}" like "${expected}"`, () => {
+            expect(actual).toBuildLike(expected);
+        });
+    }
+});
+
 describe("A begin/end parser", function() {
 
     it("should parse a simple environment", function() {
diff --git a/test/unicode-spec.js b/test/unicode-spec.js
index d1a9ba32..ec048c6a 100644
--- a/test/unicode-spec.js
+++ b/test/unicode-spec.js
@@ -16,10 +16,10 @@ const parseAndSetResult = function(expr, result, settings) {
     } catch (e) {
         result.pass = false;
         if (e instanceof ParseError) {
-            result.message = "'" + expr + "' failed " +
+            result.message = () => "'" + expr + "' failed " +
                 "parsing with error: " + e.message;
         } else {
-            result.message = "'" + expr + "' failed " +
+            result.message = () => "'" + expr + "' failed " +
                 "parsing with unknown error: " + e.message;
         }
     }
@@ -34,7 +34,7 @@ describe("unicode", function() {
 
                 const result = {
                     pass: true,
-                    message: "'" + actual + "' succeeded parsing",
+                    message: () => "'" + actual + "' succeeded parsing",
                 };
                 parseAndSetResult(actual, result, usedSettings);
                 return result;
@@ -45,7 +45,7 @@ describe("unicode", function() {
 
                 const result = {
                     pass: false,
-                    message: "Expected '" + actual + "' to fail " +
+                    message: () => "Expected '" + actual + "' to fail " +
                         "parsing, but it succeeded",
                 };
 
@@ -54,10 +54,10 @@ describe("unicode", function() {
                 } catch (e) {
                     if (e instanceof ParseError) {
                         result.pass = true;
-                        result.message = "'" + actual + "' correctly " +
+                        result.message = () => "'" + actual + "' correctly " +
                             "didn't parse with error: " + e.message;
                     } else {
-                        result.message = "'" + actual + "' failed " +
+                        result.message = () => "'" + actual + "' failed " +
                             "parsing with unknown error: " + e.message;
                     }
                 }